. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 136 Mr. E. A. Smith on Arctic Mollusca. Hah. OfF Cape Louis Napoleon, Grinnel Land, 79° 38'-N. lat., in 25 fms. Only a single specimen of this grand new Trichotropis was obtained. It is very different from any hitherto described, being remark- able for its circular aperture, conical spire, and extreme fragility. The entire surface under the epidermis is beautifully sculptured with oblique raised lines or lirulse, and minutely striated in a spiral direction between them ; and t
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 136 Mr. E. A. Smith on Arctic Mollusca. Hah. OfF Cape Louis Napoleon, Grinnel Land, 79° 38'-N. lat., in 25 fms. Only a single specimen of this grand new Trichotropis was obtained. It is very different from any hitherto described, being remark- able for its circular aperture, conical spire, and extreme fragility. The entire surface under the epidermis is beautifully sculptured with oblique raised lines or lirulse, and minutely striated in a spiral direction between them ; and the raised keels are also similarly striated. The central keel of ^ •, . "^^ .1 1 y 1 1 • 1 -Ml ,1 irichotropis tenuis. the last whorl is also visible on the ' upper ones, and is situated just above the suture. Dr. Gwyn Jeffreys, who has seen the specimen, considers it a very abnormal form of T. hicarinata. Several other con- chologists agree with me that it certainly is specifically dis- tinct. The character of the epidermis is different, since it is not produced into such very long ciliations as in the old species. The keels are very slightly prominent; the space between them is convex, and not concave ; and, finally, the growth of the shell appears to be quite regular, and does not display any appearance of distortion, such as is usually observable in abnormal growths of most species. Trichotropis horealis^ Broderip and Sowerby, Zoological Journal, iv. 1829, p. 375; Sowerby, Thesaurus Conch, iii, p. 321, pi. 285. f. 1-3; Forbes and Hanlev, Brit. Moll. pi. 101. f. 5-6; Jeffi-eys, Brit. Conch, vol. iv. pi. 4. f. 2, v. pi. 79. f. C; Sow. Conch. Icon. xix. f. 1 a-c. Trichotropis costellatus, Couthouv, Bost. Journ. Nat. Hist. vol. ii. 1839, pi. 3. f. 3 ; Sow. Thes. Conch, iii. pi. 285. f. 6 ; Conch. Icon. xix. f. 13. T. acuminata, Jeffi'eys, Brown, lUust. Conch, ed. 2, pi. 57. f. 15. T. atlantica (Beck), Moller, Naturhist. Tidsskrift, 1842, p. 85. Fiisiis mnhilicatus, Br
Size: 1552px × 1611px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
