OF SANTO DOMIXaO. 



219 



Shell short, broadly fusiform ; spire and mouth eqiral ; whorls seven, the first nuclear, the other regularly sloping 

 above, obsoletelj'^ nodose on the angle and tapering in advance. Surface marked by fine revolving striaj. Aperture 

 broad, contracted in advance ; columella bent in the middle, carrying three folds, slightly twisted in advances. 



SCAPHA. Gray. ' ' 



S. striata. Gabb, n. s. 



Two very young- shells, evidently of this genns, occur in the collection, and 1 

 venture to name them despite their immature condition. Although the largest ifi 

 barely over an inch long, they have both lost their nuclei and have the usual promi-' 

 nent but blunt apices. The larger is elongate, rather slender, the shoulder bears a 

 series of short laterally compressed nodes which form a coronated angle. The 

 suture is well marked and the whole surface is crossed by fine revolving strisei 

 Below the angle, the sides are nearly straight and narrow sinuously in advance. 

 Columella with the two prominent oblique folds. 



I have compared these evidently immature shells with all the known species and 

 cannot identify them as belonging to any one of them. 



LYRIA. Gray. . 

 L. pulchella. Sby. sp. . ' . 



Valuta ■pulchella. Sby. Quart. Jour., Vol. VI., p. 43, pi. 9, fig. 4. ' • ' " '' " 



? V. soror. Sby. loc. cit., p. 46. 



I have both the varieties of the species mentioned under the first of the above* 

 quoted descriptions, and by an examination of about 200 specimens, which shoAV 

 great variations in the number, size and characters of the ribs and in the height of 

 the spire, I am strongly, inclined to suspect that V. soror is only another of these 

 variable forms. Among '7 shells I have one variety almost undisting;uishable from 

 L. Delessertiana. The strongest difference is that some of the specimens of that 

 species are more slender than our shell* 



MITRA. Lam. 



M . H e n e k e n i . Sby., Quart. Jour. Vol. III., p. 40, pi. 9, fig. 5. 

 Id. Guppy. Loc. cit., Vol. XXIII., p. 288. 



Distinguished by its slightly convex sides and by the small number of columellar 

 folds ; but more especially by the shallow channels, or, more strictly speaking, by the 

 truncation of the upper margin of the whorl, adjoining the suture. 



M . 1 o n g a . Gabb, n. s. 



Sliell very attenuate, spire as long, and in old specimens much longer than the mouth ; whorls about twelve, 

 nearly flat on the sides ; body whorl veiy broadly convex in the middle ; suture distinct ; surface marked by large 

 and acute revolving ribs, with occasionally smaller ones interposed. In the interspaces, fine longitudinal and revolv- 

 ing lines form a distinct cancellation. Aperture long, slender, narrowing very little in advance. Inner lip with four 

 distinct and one or two faint folds. 



Distinguished from the preceding by its very slender form and the greater number 

 of columellar plaits. 



