98 BULLETIN OF THE 



Boilla (?) eburnea n. s. 



Shell small, ivory-white, polished, ovate, the aperture extended posteriorly 

 a little beyond the left hand summit of the whorl ; sculpture a few spiral 

 grooves near either extremity, more numerous and crowded anteriorly ; these 

 grooves somewhat zigzag from irregularities of growth, but not puncticulate ; 

 remainder of the shell without sculpture, except most minute microscopic faint 

 indications of spiral striae and faint lines of growth ; apex minutely pitted, 

 but the pit nearly covered by a small reflexion of the lip where it joins the 

 posterior face of the body ; outer lip thin, sharp, curved round and reflected 

 at the anterior end of the axis ; a thin deposit over the body within the 

 aperture. Lon. of shell and aperture, 7.25. Max. lat. of shell, 4.25 ; of ap- 

 erture, 2.0 ; miu. lat. of aperture, 0.75 mm. 



Station 43, 339 fms. 



The description of Diaphana gemma Verrill is the only thing I can find 

 which bears any resemblance to this species ; but the size and proportions 

 of that species are different, it is umbilicated, and B. ? eburnea does not seem 

 likely to prove a Diafhana* 



Atys (?) bathymophila n. s. 



Shell large, stout, white, polished, sculj)tured with numerous puncticulate 

 strife, crowded toward the ends and few and distant in the middle ; outer lip 

 extending backward a short distance from the spire, then sweeping downward, 

 forward, outward, and then upward, curving downward and backward again to 

 join the subtruncate columella, above and behind which there is almost a 

 canal ; columella reflected, with a tolerably thick callus, but no umbilicus or 

 umbilical chink ; body with a thhi deposit of callus (in one instance much 

 thickened and roughened, apparently by disease); aperture very narrow behind, 

 very wide and somewhat oblique in front ; lines of growth on the surface 

 hardly visible. Lon. of shell and aperture, 16.5 ; from summit to oblique 

 truncation of columella, 13.75. Max. lat of shell, 11.25; of aperture, 7.0; 

 min. lat. of aperture, 1.0 mm. 



Station 33, 1,568 fms. 



In young specimens 3.5 mm. long there are three and a half whorls ; the 

 nucleus is visible turned on its side and half immersed ; it is heliciform, trans- 

 lucent white, and minute ; the striation is more uniformly distributed over the 

 shell, and is exceedingly fine ; the nucleus (but not the whorls outside of it) 

 remains partly visible until the shell has attained a length of 8.25 mm. Like 

 most young shells of this group, the young are more pointed before and be- 

 hind, and less expanded than the adult. 



Yucatan Strait, 640 fms. 



* A comparison of specimens shows that they are perfectly distinct. 



