|Statement||by W. O. Addicott.|
|Series||Contributions to paleontology, Geological Survey. Professional paper ; 503-B, Geological Survey professional paper -- 503-B.|
|The Physical Object|
|Pagination||24 p., 4 leaves of plates :|
|Number of Pages||24|
Some western American Cenozoic gastropods of the genus Nassarius (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: Warren O . Gastropod - Gastropod - Reproduction and life cycles: Gastropods originated in the oceans, and relics of this fact are preserved in the early life history of freshwater and land species. Only in the most primitive prosobranchs (such as abalone) are the gametes released into the water for fertilization to take place outside the female. The fertilized egg hatches into a free-swimming form. Nassarius (Profundinassa) Thiele, J., Type species: Nassarius (Profundinassa) babylonicus Watson, R.B., Nassarius (Profundinassa) babylonicus (3) Nassa turrifera. 2 papers (from Johnsonia): The genus Modulus in the Western Atlantic (6p) / The genus Cyclostrema in the Western Atlantic (8p). Some Western American Cenozoic Gastropods of the Genus Nassarius. 24 p., 1 fig., 3 pls, 4to, wrps. West American Cenozoic Pholadidae (Bivalvia). p., figs, 4to, paperbound.
Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): ersitylibrary (external link). Part 2 / Nautilus Shells as collectors’ items in the “Kunst- und Wunderkammer” / The living species of the genus Hydatina / A review of the genus Clanculus in Australia. 64 p., 30 figs (some col.), 4 col. pls, 4to, wrps. Vita Marina 43(); MM € Page/Plate; Proc. Boston Soc. Nat. Hist. Vol. 3, p Encyclopedia of Marine Gastropods: p /5: Audubon - Field Guide to North American Shells. The dentition and musculature of some Middle ordovician (Llandeilo) bivalves from Finist re, France. Reprint Paleontology 13; pp. , 22 fig. Orig. wrps., libr. stamp on cover. 5. Bradshaw, M.A. - The dentition and musculature of some Middle Ordovician (Llandeilo) bivalves from Finist re, France. - Palaeontology 13; pp. ,
Some gastropods have both sexual organs, meaning that some are hermaphroditic. One interesting animal is the slipper shell, which may start out as a male and then change to a female. Depending on the species, gastropods may reproduce by releasing gametes into the water, or by transferring the male's sperm into the female, who uses it to. Some western American Cenozoic gastropods of the genus Nassarius. United States Geological Survey, , Geological Survey Professional Paper, PP B: 24 pages with 3 plates. Softbound, xlib, usual signs of use, text in very good condition. $ Gastropods first appeared in the early Cambrian and reached their peak diversity in the Cenozoic. Gastropods may have a calcareous shell or be entirely soft bodied. They have a well-developed head and sensory organs and an expanded muscular foot (Fig. ). In terrestrial gastropods the gills are lost and the mantle cavity is modified into an. The gastropods, the "belly-footed" mollusks, are the most varied and abundant of the mol-luskan classes group includes the snails and slugs, forms both with and without a calcareous shell. During a history spanning the entire Phanerozoic, gastropods evolved creeping, floating and swimming strategies together with grazing, predatory and parasitic trophic styles.