Marcus Ward Lyon

Name: Notes on the Slow Lemurs
Author: Marcus Ward Lyon

Notes on the Slow Lemurs (1906)

Summary

“Notes on the Slow Lemurs”, published in 1906, is a work by Marcus Ward Lyon. It explores elements such as Nycticebus, upper incisors and skull.

Quotes from Notes on the Slow Lemurs (Marcus Ward Lyon)

Marcus Ward Lyon, Notes on the Slow Lemurs (1906)

“ On the dark face marks when present and along the dorsal stripe the terminal color of the hairs is much darker, varying from a light, bright russet to a very dark brown.
The long straight hairs have little to do with the real general color effect. They seem to be very similar in color to the woolly hairs except at the tip, where there is a large white subterminal ring about 3 to 5 mm. wide. The apical ring is about 1 to 2 mm. wide and dark in color, which is not seen ordinarily and has no effect on the general color. ”

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Source: Wikisource

Marcus Ward Lyon, Notes on the Slow Lemurs (1906)

“ The dorsal stripe usually widest over the shoulders may extend the whole length of the back or gradually disappear in the lumbar region. In color it varies from a rich, deep brown similar to seal brown to a dark tawny. Face markings are conspicuous and concolor generally with the dorsal stripe. Underparts dirty pinkish or cream buff, the slaty bases of the hairs showing through.
Skull and teeth.—Temporal ridges meet to form a sagittal crest in old age. Upper incisors four in the young and usually in the adult, though they may be reduced to three or two ”

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Source: Wikisource

Marcus Ward Lyon, Notes on the Slow Lemurs (1906)

“ Specimens examined.—Seven skins with skulls, five from the Malay Peninsula and two from the west coast of Sumatra, and one alcoholic from west coast of Sumatra.
Remarks.—One specimen. Cat. No. 84389, U. S. N. M., from Trong, Lower Siam, has a skull differing considerably from the others of the series. Its brain case is much depressed and the outer and upper walls of the orbit stand out and up from the rest of the skull much more than they do in the other specimens. ”

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Source: Wikisource

Marcus Ward Lyon, Notes on the Slow Lemurs (1906)

“ A full set of teeth is no criterion that an animal is fully adult, and only in very old age do the teeth show much wear. In comparing any two species, it is necessary to select individuals of the same age. (See table of measurements, p. 537, and Plate XIII.)
As noted by most writers, the number of upper incisors in the Slow Lemurs varies between two and four, the usual view being that the smaller outer pair are dropped in old age. An examination of the present material shows that the Bornean Slow Lemur never has but two upper incisors. Examination of a very young skull, Cat. ”

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Source: Wikisource

Marcus Ward Lyon, Notes on the Slow Lemurs (1906)

“ Most writers have placed considerable weight on color as a specific character, often from lack of material overlooking the wide range of variation in specimens from a given locality. The only attention paid to cranial characters seems to have been confined to the number of upper incisors. ”

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Source: Wikisource

Marcus Ward Lyon, Notes on the Slow Lemurs (1906)

“ No. 142233, U. S. N. M. Very old aduly male, Sakaiam River, Sanggau district, western Borneo. Cat. No. 142234, U. S. N. M., type. Figs. 5–8, Nycticebus malaianus, showing progressive increase in size, and the development of the sagittal crest with increasing size.
Nearly adult male, Johore Lama, Malay Peninsula. Cat. No. 114151, U. S. N. M.Adult female, Rumpin River, Pahang, Malay Peninsula. Cat. No. 115496, U. S. N. M.Old adult female, Tringanu, Malay Peninsula. Cat. No. 105022, U. S. N. M.Old adult male, Tapanuli Bay, western Sumatra. Cat. No. 114460, U. S. N. M. ”

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Source: Wikisource

Marcus Ward Lyon, Notes on the Slow Lemurs (1906)

“ Nat. et de phénom. de la nature, vol. IV, p. 617, says textually ‘Geoffroy and Cuvier published together in vol. VI (?) of the Magasin encyclopédique a classification of mammals, which we transcribe entire: ... ”

Marcus Ward Lyon

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