OF SANTO DOMINGO. 



207 



recent shells. There is one constant character, apart from the form. The notch of 

 the outer lip is bi'oaclly sub-angular and is only coincident with the most prominent 

 of the ribs when they differ in size. This rib occupies the posterior angle of the body 

 whorl. Mr. Guppy's figure of P. Barretti represents the size of the largest specimen 

 found by Mr. Bonaczy. 



T. (Surcula) Henekeni. Sby. sp. • ■ . 



Pleurotoma. Id., Sby. Quart. Jour. Vol. VI., p. 50, pi. 10, fig. G. 

 T. (Surcula) Jaquensis. Sby. sp. 

 P. Jaquensis. Sby. Loc. cit. p. 51. 



]N^ot a very common species but easily distinguished by its robust fusiform shape 

 and unusually heavy longitudinal ribs. In the young stage it is proportionally more 

 slender. I have before me a few smaller specimens, so nearly like the typical form 

 that I dare not separate them, though they show some small points of difference. 

 The longitudinal ribs are a little more oblique and the revolving ribs are smaller and 

 more numerous, but my experience with T. vdrgo renders me timid in attaching 

 great importance to these characters, unless proven by a larger series than I yet 

 possess. 



T. (Surcula) rara. Gabb, ii. s. 



Shell elongated fusiform ; spire high, -whorls numerous (number unknown), slightly convex on the sides ; body 

 whorl rounded in the middle, sloping upwards nearly straight to the suture, concavely tapering in advance ; suture 

 impressed. Surface marked by a large number of equal revolving ribs, crossed by well-marked, irregular lines of 

 growth. Mouth long, narrow ; canal long ; inner lip smoothly encrusted ; outer lip acute. Sinus distant from the 

 suture, broadly sub-angular. Length between 2 and 3 inches. 



A single specimen which has lost both the apex and the end of the canal. It is 

 most nearly allied to T. Ccnyenteriaiia, Gabb, from the later Tertiaries of California, 

 but is much more slender, with a proportionally longer spire and canal, and the notch 

 of the outer lip is sub-angulated instead of being broadly concave, as in that species. 



T. (Surcula) Parkeri. Gabb, n. s. 



Shell slender fusiform ; spire high, longer than body whorl and canal. Whorls eleven prominent in the middle, 

 slightly concave toAvards the suture, which is linear and undulated. Surface ornamented by about ten very promi- 

 nent acute longitudinal ribs, with broad, smooth, concave intei'spaces. Aperture long, narrow ; canal straight ; 

 inner lip rather heavily encrusted, sinus broad, rounded, moderately deep and placed near the suture. Length about 

 one inch. 



A rare little shell, with ornamentation resembling that of Mangelia. 



T. (Drillia) militaris. Hds. sp. 



Glavatula Id., Hds. Proc. Zool. Soc. 1843, Vog. Sulph., p. IG, pi. 5, fig. 10. 

 Drillia. Id., II. & A., Ad. Gen. Itec. Moll. 



Pleurotoma consors. Sby. Quart. Jour. Vol. VI., p. 50. ♦ 

 Id., Giippy. Loc. cit. Yol. XXII., p. 289. 



With very similar sculpture to Drillia venusta, Sby., this shell can be distinguished 

 at all ages by its moi'c slender form. Described by Hinds as living at Panama. 



