274 ATYS. 



middle ; vertex depressed ; aperture moderately narrow above, pro- 

 duced a little above the vertex, dilated somewhat toward the base ; 

 lip thin, thickened toward the middle of the vertex ; columella ar- 

 cuate, a little reflexed ; umbilical region distinctly perforated. 

 Alt. 7, diam. 4 mill. (&). 



Teneriffe, Canary Is. 



A. canariensis E. A. S., Ann. Mag. N. H. (4), ix, p. 346. 



Of the form of the young state of A. naucum; but the striae are 

 less distinct and not so far apart ; also very like caribaea D'Orb., 

 but rather broader ($.). 



A. CARIB^A Orbigny. PI. 48, fig. 12 ; PI. 28, figs. 33, 34. 



Shell oval, oblong, thin, fragile, smooth, attenuated and trans- 

 versely striated at both ends ; spire entirely concealed, marked by 

 an imperforate umbilical depression ; aperture narrow, a little arcu- 

 ate, wider in front ; columella acute, a little separated by an umbil- 

 ical depression. Color uniform white. Alt. 5, diam. 2 mill. (Orb.). 

 Martinique, Jamaica, Guadeloupe, St. Thomas, Cuba. 



Bidla caribcua ORB., Moll. Cuba, i, p. 127, pi. 4, f. 21-24. 



Orbigny's description and figure, given above, are not good. The 

 species is better represented by fig. 12 of pi. 48. 



The shell is oblong, varying somewhat in length, somewhat more 

 compressed above than below, marked by widely spaced spiral 

 grooves above and below, these grooves becoming closer and deeper 

 toward the ends. From the center of the narrow, concave vertex 

 rises the distinctly plicate lip. The columella is vertical, thickened 

 but not toothed in the middle, the edge reflexed, partly concealing 

 the narrow but distinct umbilicus. Alt. 10, diam. nearly 5 mill. 



Not having seen the types of the two species following, I am un- 

 able to say whether they are forms of this one or deserving of spe- 

 cific rank. 



A. GUILDINII Sowerby. PI. 28, fig. 46. 



Shell ovate, thin, dull grayish-white, attenuated posteriorly, spir- 

 ally striated near the ends, slightly longitudinally wrinkled, ven- 

 tricose below the centre, slightly umbilicated at each end ; outer lip 

 elevated above ; subacuminated, inflected ; columella thin, rather 

 straight (Sowb.). 



This species is one of the very few in the genus Atys which pre- 

 sents the character of possessing longitudinal wrinkles or stride 



(Sowb.). 



St. Vincent, West Indies. 



