305 Dominican Fossils — Maury 141 



what obscure; whorls twelve to thirteen, the first three smooth, 

 nuclear; post-nuclear whorls convex, ornamented with many, 

 close-set, undulating, longitudinal ribs (fourteen on the last 

 whorl) which on the later volutions usually either do not quite 

 extend to the upper (posterior) suture, or else are suddenfy bent 

 to the left and diminished on approaching it; the entire surface 

 of the shell, excepting only the protoconch, exhibits under the 

 lens a most curious texture which might be likened to a woven 

 cloth in which the woof (representing the spirals) is some- 

 what coarser than the warp; there is one heavy, rounded 

 varix to each volution, that of the last whorl bordering the lip, 

 but those of the preceding whorls forming a more or less continu- 

 ous line ascending obliquely up the shell; aperture small, ovate; 

 lip bordered by a very thick, minutely crenulated, platform-like 

 varix sunken a trifle below the level of the lip. Length 16, 

 width 4.75 mm. 



This curious species is characterized by its singular texture 

 and extraordinary lip recalling that of Cirsotrema Moerch, but 

 the shell is not cancellate as in that section. A species slightly 

 resembling our fossil was dredged by the Blake in 100 fms. off 

 Barbados and described by Dall as Scala hellenica var. Moerch- 

 iana. 



Locality. — (Exp'd '16) Zone E, Rio Gurabo, at Los Que- 

 mados (Rare). 



Genus Acxis Loven 



Aclis acuminatoides, n. sp. 

 Plate 24, Figure 7 



Shell minute, polished and shining, apex broken, remaining 

 whorls seven and a half, slightly convex especially anteriorly, en- 

 tirely smooth and without ornament; suture distinct, linear, not 

 channeled. Length of shell 3.6, greatest diameter .75 mm. 



This species is named from its resemblance to the Jamaican 

 Aclis acuminata Guppy but that is characterized by its over- 

 hanging whorls, while ours only widen very slightly anteriorly, 

 are more closely coi'ed, flatter, and not so constricted at the 



