212 



T. (Eanulaiia) D omiii g en sc. Gabb, n. s. 



Shell small, spire high, as long or Linger than the mouth ; apex blunt ; whorls eight? (the last nuclear wiiOris avr^ 

 broken in all my specimeiis) ; below the nucleus there are three whorls which are caueellate, but do nut bear recogniz- 

 able varices, while the last three whorls have large varices < Whorls convex, the upper ones distinctly bi-angulated, 

 and sloping above- Surface marked by four large tubercles on the angle of the whorls, between each pair of vari- 

 ces ; the whole surface crossed by revolving ribs crossed by more or less strongly marked lines. Aperture oval ; 

 lips slightly produced ; inner lip rugose ; outer lip strongly costate internally ; canal moderate. Length 1 inch. 



l^ot tinlike T. antillarnm, cVOrb,, but with a much higher spire and shorter canaL 



DISTORTIA- Bolt. 



D. s i m i 1 1 i m u Sby. sp, 



Triton, id. Sby. Quart. Jour. Vol. VI, p. 48. .. ' . ' - 



rersoiKC, id. Guppy. loc cit. Vol. XXII, p. 388, pi. 17, fig. 13. 



Closely allied to Triton constrictus of the West coasty but differs in having more 

 numerous revolving ribs. 



BURSA. B(.'lt- . . 



B. crassa, Desh. - i - ■ 



Ranella crassa^ Uesh., Rve. Icon. Comch., sp- 18. ^ - '' ' " ■ 



zrf- Guppy- Qisart- Jour- GeoL Soc. V.23, p. 2^8; pL 18, fig. 9- 



^ PHOS. Montf- . _ - ' . ' ■ ■ • 



P. Veraguerisis. Hds. Am< Nat- Hist., vcl. XI, p. 25G- . . , . :• 



Id, Hds. Voy. Sulph. p. 87, pi. 10, lig. 13, 14, 



P. Moorcii Guppy- Quart. Jour, Geol. Soc, Vol XXII, p. 290, pi. 1(3, fig. It. , 

 P. elegans. Guppy. loc. cit. fig. 13. .. - - , . 



After a careful study of about 130 specimens, I feel farced to differ with both 

 Messrs. Moore and Guppy in regard to this shelL That Guppy's two species *are 

 based on different ages only of one I have clear j)roof ; and I can find no character on 

 which to separate this from the shell described by Hinds, and admirably well figured 

 in the report of the voyage of the Sulphur. 



p. G u p p y i, Gabb, n. s< 



Shell elongate, spire high, larger than the aperture vfhoi'ls regularly convex on the sides ■ ten or eleven in 

 tiumber. Surface marked by a few broad longitudinal ribs, prominent on the spire, less distinct and occasionally 

 obsolete on the body whorl, and crossed by numerous very small revolving lines ; aperture broad, inner lip with but 

 a single fold in advance ; outer lip internally striate.- 



p. semicostatits- Gabb, n, s. 



Shell robust, spire longer than the mouth ; whorls nine 5 suture f?-ell marked- Surface orrjarr*entecl by numerous 

 large rounded longitudinal ribs on the apical whorls, which suddenly become fewer on the penultimate, and are 

 represented by but one, or two at most, on the body volution. These latter are ahnost as prominent and noticeable 

 as the varices of Triton. The whole surface is crossed by numerous prominent revolving ribs with usually a distinct 

 alternation in size. Besides these and replacing the large radiating ribs, or rather placed between them, are more 

 <or less distinct longitudinal lines crossing the transverse series. Inner lip thickened posteriorly ; outer lip internally 

 striate. 



P. cost at us. Gabbj 11. s. ' - . ■ 



Shell short, robust, spire longer than the ixioUth ; v/borls nine ; very convex ; sutvire deep. Surface covered with 



