. The Cambridge natural history. Zoology; Zoologia Geral. i6 ORIGIN OF FRESH-WATER UNIVALVES CHAP. reason why the ancestry of all Pulmonata, whether land or fresh- water, is so difficult to trace. (5) Gasteropoda. — (1) Operculate. Canidia and Clea are closely allied, with but little modification, to the marine Cominella ^ (Fig. 11), as is also Nassodonta to Nassa. They occur (in fresh water) in the rivers of India, Indo-China, Java, and Borneo, associated with essentially fresh- water species. Potamides^ with its various subgenera (^ Telescopium, Pyrazus, Pirenella, Cerithidea, etc.), all of
. The Cambridge natural history. Zoology; Zoologia Geral. i6 ORIGIN OF FRESH-WATER UNIVALVES CHAP. reason why the ancestry of all Pulmonata, whether land or fresh- water, is so difficult to trace. (5) Gasteropoda. — (1) Operculate. Canidia and Clea are closely allied, with but little modification, to the marine Cominella ^ (Fig. 11), as is also Nassodonta to Nassa. They occur (in fresh water) in the rivers of India, Indo-China, Java, and Borneo, associated with essentially fresh- water species. Potamides^ with its various subgenera (^ Telescopium, Pyrazus, Pirenella, Cerithidea, etc.), all of which inhabit swamps. Fig. 11.—A, CoraineUa, a marine genus, which lives between ^nd mudflats iust above high-water mark in all which is probably warm countries, are derived from Cerithium derived B, Clea, a (Fig. 12) ; Assimiuea, HydroUa, and perhaps genus occurring only ^ no rt- -ti • iii in fresh water. TruncateUa, irom Kissoa. It is a remarkable fact that in Geomelania (with its subgenera Chittya and Blandiella) we have a form of Truncatella which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. [London, Macmillan and co. , limited; New York, The Macmillan company
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