Pholas

Definition and stakes

Portrait of John Timbs John Timbs,  Eccentricities of the Animal Creation

“ The priority of the demonstration of the Pholas and its "boring habits" has been much disputed. The evidence is full of curious details. It appears that Mr. Harper, of Edinburgh, author of "The Sea-side and Aquarium," having claimed the lead. Mr. Robertson, of Brighton, writes to dispute the originality; adding that he publicly exhibited Pholades in the Pavilion at Brighton in July, 1851, perforating chalk rocks by the raspings of their valves and squirtings of their syphons. Professor Flourens (says Mr. Robertson) taught my observations to his class in Paris in 1853 ”
Source: Gutenberg

John Harper,  Glimpses of Ocean Life; Or, Rock-Pools and the Lessons they Teach

“ The Pholas is iron-bound as to ligament, which in it is far more powerful in securing the valves, than is the shell of any other group of the acephala, of similar fragility and tenuity!'
[14] In the Athenæum (Nos. 1632 and 1636) , were kindly published two letters from the author on the above subject, under the respective dates January 26th, and February 28th, 1859.
[15] The above remark holds good, even although (as is frequently the case) the animal wilfully deviates from the straight path, and bores its tunnel in a curved form.
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Source: Gutenberg

John Harper,  Glimpses of Ocean Life; Or, Rock-Pools and the Lessons they Teach

“ From this we may conclude that the depth of the perforation, which is seldom many inches, depends entirely upon the growth of the mollusc.
When keeping specimens of the Pholas for observation, the usual plan is to chip away the rock to the level of the valves, so that the whole of the animal's siphonal tubes may be distinctly seen, however slightly these organs may be extended. This plan, I found, did very well for a time, but I was annoyed to witness, that in the course of a few months, the siphons ceased to be either advanced or retracted,—they having become, as it were, rudimentary.
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Source: Gutenberg

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