6 University of Michigan 



Greatest Height Diameier 



Altitude diameter aperture aperture 



9;)4 vvhorls 11.8 mm. 23 (2.7 mm.) 23 (2.7 mm.) 13 ( 1.5 nrm.;'. 



BULIMULID.^. 

 Drymccits inultilincatus (Say). Two dead, bleached specimens. 



UROCOPTID.E 



Microceramus bonairensis curacoana, new siil:)species 



Figs. 1-4, 5 



Eighty-two specimens, some hving, under bits of coral rock 

 on outskirts of Willemstad, Curacao. 



Shell distinctly rimate, turrite to lanceolate ; last 4 whorls 

 almost ecjual in diameter, but the penultimate slightly the broad- 

 est; earlier whorls gradually, or cjuite rapidly increasing in 

 size. Color: light corneous to dark brown, usually marked 

 with opacjue, milky-white, irregular varices, which may be so 

 extensive as to obliterate the corneous ground-color on the last 

 whorls. Whorls: 9 to 11, somewhat convex; the first half- 

 whorl smooth and polished ; the next ones with minute, regu- 

 lar, closely spaced axial riblets, which are also quite well- 

 marked on the corneous portions of the last whorls, but are 

 almost oljliterated by the thickening of the interstitial spaces 

 on the opaque, whitish portions; these thickenings on the last 

 whorls may develop several heavy, irregular, raised, spiral 

 lines ; last whorl with a quite well-marked, basal angulation, 

 which gives the shell a peculiar sul)truncate appearance when 

 viewed from behind, and which is much more i')rominent in 

 young shells. Aperture: nearly circular; ])eristome whitish, 

 but slightly thickened and reflexcd, inc()m])lete on the parietal 

 margin, most reflected on the columcllar. Columella inside of 

 whorls ; cylindrical and quite slender, showing only a very 

 vague spiral undulation. 



