Lectures On Mollusca Or Shell Fish And Their Allies
The book Lectures On Mollusca Or Shell Fish And Their Allies was written by author Philip P Philip Pearsall Carpenter Here you can read free online of Lectures On Mollusca Or Shell Fish And Their Allies book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Lectures On Mollusca Or Shell Fish And Their Allies a good or bad book?
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The CaBcids culminate in tropical America, east and west ; and are curiously rare in the Pacific ocean. GM 62 LECTURES ON MOLLUSCA. Family VERMETIDJE. (Worm-Shells. ) On almost all shells and stones that have lain long in the sea are to be found irregularly twisted shells, sometimes assuming a more or less spiral form, sometimes almost straight. A large proportion of these have no connection with shell-fish : being true worms, the sea analogues of the earthy tribes : jointed animals with red bl...ood and symmetrical organs. When taken alive, these are recognized by the beautiful bunch of feelers, bearing an operculurn (sometimes adorned with stag's horn processes, and never spiral) on a fleshy cup in the middle. Some of these, , as the tiny Spirorbis, so prolific on sea weeds, stones, &c. , in the colder seas, have pretty regularly formed spiral shells. But in the tropical and warmer temperate regions, many species are found, the animal of which is not indeed so beauti- ful, but far more highly organized.
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