. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. B. notabilis, partially extended, en- larged. BINNEY A, J. G. Animal heliciform, obtuse before, rapidly acuminated behind ; mantle sub- central, extending anteriorly beyond the shell; a distinct locomotive disk; no caudal mucus pore; respiratory orifice poste- rior, on the right edge of the mantle; anal orifice contiguous to last; genital orifice behind the right eye-peduncle. Shell entirely external, ear-shaped, nearly flat, about one third as long as the animal, which it does not half cover when retracted.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. B. notabilis, partially extended, en- larged. BINNEY A, J. G. Animal heliciform, obtuse before, rapidly acuminated behind ; mantle sub- central, extending anteriorly beyond the shell; a distinct locomotive disk; no caudal mucus pore; respiratory orifice poste- rior, on the right edge of the mantle; anal orifice contiguous to last; genital orifice behind the right eye-peduncle. Shell entirely external, ear-shaped, nearly flat, about one third as long as the animal, which it does not half cover when retracted. Spire flattened, forming two horizontal volu- tions, last whorl enormously expanded and slightly arched. Columella distinct, entire, hiding the interior of the convo- lutions ; peristome simple, acute. In estivation the part of the animal ex- cluded from the shell is protected by a thick, white, parchment-like epiphragm. A genus of the Mexican fauna, whence it has been introduced on Guadelupe Island off the west coast of Mexico, and Santa Barbara Island, coast of California. The jaw is thick, slightly arcuate, ends blunt; anterior surface with six well-developed ribs, denticulating either mar- gin, situated on the central third of the jaw, and as many subobsolete ribs on each outer third; no median projection. (Fig. 142.) i Animal heliciforme, antice obtusum, postice rapide acuminatum. Pallium subcen- trale, extra testam antrorsum prolongatum. Discus gressorius distinetus. Porus mucosus caudal is nullus. Apertura respiratoria et analis ad dextram sita, in parte posteriore niar- ginia pallii. Apertura genitalis post tentaculani dextram oculig^ram. Testa externa, paucispira, haliotoidea, animal non includens. Pars exclusa in hibernis epiphragmate albido, duro, membraneo protecta. Maxilla arcuata, costis validis exarata. Dentes linguales quadratw, centrales tricuspi- datoe, laterales et margiuales bicuspidatse. Fig Jaw of B. Please note that these images are extr
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1870, booksubjectzoology
