1896.] NATURAL SCIENCES OF PHILADELPHIA. 429 



Three specimens examined, of which one, collected by Dr. Baur, 

 contained the soft parts. Owing to the fact that the specimen had 

 been partially dried up, it was impossible to examine the genitalia. 



The jaw was like the jaw oiB. nux,\vith about 18 irregular flat plate- 

 like ribs, whose blunt ends denticulate the margin, especially the cut- 

 ting edge. The outer margin of these plates is a little raised and thick- 

 ened, the color is pale amber, darker where thickest. The radula 

 was rather broad, the single teeth did not differ in outline from those 

 of B. nux more than those of one specimen of wmx differs from those 

 of another. The number of laterals is 14, of marginals 23, the 



formula J 



23+14-14 + 23 



It will be observed from these facts that nothing in the dentition 

 of B. achatelliniis justices the presumption that it deserves a section 

 to itself. In Dr. Baur's specimen, the nucleus is delicately trans- 

 versely ribbed, the vertex almost umbilicate, the earlier whorls 

 nearly white and opaque, pinched up into irregular little tubercles 

 at the suture ; the later whorls have revolving dark brown color 

 bands, separated by whitish interspaces covered with a yellowish 

 epidermis. The base is mostly pale, with a dark band around the 

 umbilicus. The outer lip is sharp-edged, and the umbilicus small. 

 The pillar is short and straight. 



A specimen sent by Cuming to Dr. Lea is not so large, and is 

 darker colored, the ground color being an olivaceous brown with a 

 narrow chestnut band at the periphery ; the base pale and the um- 

 bilicus entirely closed. The nodulous band in front of the suture is 

 present and of a whitish color. 



The name applied by Forbes was achatellinus, which, by several 

 authors, on the assumption that it was intended as a diminutive of 

 Achatinella, has been emended to achatinellinus, a most awkward 

 and clumsy word. But it is just as likely that he intended the word 

 as a diminutive of the same root as Achatina ; and, at any rate, no 

 one has the right to make changes on an unsupported assumption, 

 for which reason the original form is retained here. 



Bulimulus (Nsesiotus) nux Broderip. Plate XVI, figure 6; Plate XVII, figure 10. 



Bulinus mix Brod., P. Z. S., 1832, p. 125, (Charles Id.) ; Sby., Conch. 111., p. 

 6, figs. 37, 37*, 1833. 



Bulimtis nux Desh. in Lam. An. s. Vert., ed. ii, vol. viii, p. 276, 1838 ; Pfr., 

 Mon. Hel. Viv., II, p. 183, 1848; Reeve, Conch. Icon., pi. xxiii, fig. 150 (not 

 typical) ; Smith, P. Z. S , 1877, p. 72. 



Bulinimiis nux Beck, Ind. Moll., p. 70, 1838. 



Bulimus {Nasioius) nux Albers, Heliceen, p. 162, (Type of section). 



