. Bulletins of American paleontology. CiiNozoic Naticidae: Marincovich 179 mm X mm, whereas the largest fossil (lower Pliocene of Oregon) measures mm X mm. The middle Miocene to early Pliocene species N. (C.) oregonensis attained mm X mm but averaged about 24 mm X 19 mm. The northern Naticinae are distinct from the southern (tropi- cal) species not only in thermal tolerance but also in general shell morphology. The modern Cryptonatica and Tectonatica species are larger and more globose, with proportionately thicker shells, more plainly ornamented opercula and drab
. Bulletins of American paleontology. CiiNozoic Naticidae: Marincovich 179 mm X mm, whereas the largest fossil (lower Pliocene of Oregon) measures mm X mm. The middle Miocene to early Pliocene species N. (C.) oregonensis attained mm X mm but averaged about 24 mm X 19 mm. The northern Naticinae are distinct from the southern (tropi- cal) species not only in thermal tolerance but also in general shell morphology. The modern Cryptonatica and Tectonatica species are larger and more globose, with proportionately thicker shells, more plainly ornamented opercula and drabber colors than species in southern subgenera. These distinctions have existed since at least the early Miocene and have been increasingly emphasized through time, judging by the size differences between fossil and modern specimens of the same species. The northeastern Pacific Polinicinae generic taxa occur in a greater variety of marine climatic zones than do those of the Natici- nae, although there is still some provincial segregation by subgenus (Text-fig. 4). Species of Polinices, occur in tropical waters, and some of them range throughout the tropical eastern Pacific. This subgenus is essentially restricted to the tropics worldwide in Ceno- zoic faunas. Polinices (Polinices) -panatnaensis (Recluz) is re- FAUNAL PtiaVINCES ARCTIC OREGONIAN CALIF- ORNIAN NATICA NATICA. S S NATICARIUS LUNAIA GLYPHEPITHEMA STICMAULAX CRYPTONATICA TECTONATICA CHORISTES AMAUROPSIS BULBUS CALINATICINA EUNATICINA POLINICES POLINICES, EUSPIRA MAMMILLA HVPTERITA .MEVERITA NEVEftlTA. S S GLOSSAULAX SINUM â NORTHWESTERN PACIFIC. Text-figure 4. Modern distribution of naticid generic taxa in degrees of latitude and in relation to shallow-water faunal provinces of the northeastern Pacific. Unconfirmed range data shown as dotted Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
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