176 CHILONOPSIS. 



HEIM, Bull. Soc. Imp. des Naturalistes de Moscou, xxi, 1848, 

 p. 236, pi. 3, f. 1, 2, reproduced in J. de Conch. 1, 1850, p. 87, 

 pi. 4, f. 6. 



Bulimus darvinianus FORBES, Journ. Geol. Soc. London, 

 viii, p. 198, pi. 5, f. 1 (1852). Bulimus darwinianus WOLL., 

 Testae. Atl. p. 549. 



Bulimus auris-muris SHUTTLEWORTH, Diagn. n. Moll, 

 (p. 20), in Mittheil. Naturforsch. Gesellsch. in Bern, 1852, p. 

 200, = Bulimus auris-myoxi SHUTTLW., t. c., p. 289, = Buli- 

 mus myoxus SHUTTLW. 



Mr. Smith writes as follows of the specimens collected by 

 Captain Turton: "The freshest examples are of a light red- 

 dish color and generally of a somewhat darker tint towards 

 the apex. The top of the plications at the suture are whit- 

 ish, and there is more or less of this color variously distri- 

 buted over the surface in the form of irregular streaks and 

 blotches. A few subfossil snails' eggs obtained at Sugarloaf 

 Ridge along with this species evidently from their size belong 

 to it. They are roundly ovate, being 6y 2 mm. in length and 

 6 broad. Some other much smaller eggs were also found by 

 Captain Turton at the same place, but in this instance it 

 would be mere guesswork to suggest to which species they 

 belong. ' ' 



This largest species of the genus has some resemblance to 

 certain forms of the Bulimulid genera Placostylus and Auris, 

 though with no relationship whatever to either. The neanic 

 sculpture has extended upon the embryonic whorls, begin- 

 ning on the later half of the first one, being thus more accel- 

 erated than in the other species. The heavy, irregular cal- 

 louses of the aperture of the normal adult C. nonpareil 

 are a character of old age. The species is thus markedly 

 phylogerontic. It is extremely variable, different parts of 

 Sugarloaf Ridge having different varieties, according to 

 Captain Turton. The following varieties have received 

 names : 



la. Var. subspiralis Woll. Covered rimate, the whorls less 

 striated longitudinally, but obsoletely, obtusely spirally 

 costate. Parietal callous far within, in the middle tuber- 

 cular-swollen. 



