ACT.'EON. ] 63 



Station 19,310 fins. (Sigsbee) ; Station 5U (Lat. 26° 31' and Lon. 

 -85° 53'), in 119 fms.; Station 290, of Barbados, in 73 fms., coral, 

 bottom temperature 70° 75°,F; and Station 100, off Morro Light 

 Havana, in 250-400 fms. ; Off Point Gallegos, eastern Patagonia, in 

 501 fms. 



A.fasciatusf Dall, Bull. M. C. Z. ix, p. 94, 1881, not of Lam- 

 arck. — A. delicatusT>Ki^ij, Blake Gastr., p. 41, pi. 17, f. 5, 1889; 

 Proc. U. S. Nat. Mus. xii, p. 296, 1889. 



The difference between the nucleus of this species and that of A. 

 Cumingii is noted under the latter species. It is just possible that 

 that it is to the present species that is to be referred the single spec- 

 imen obtained by Gabb, and which he referred to A. tornatilis. The 

 latter is not known from this region. 



A. CURTULUS Dall. Unfigured. 



Shell small, short, subglobular, white, not polished ; surface 

 covered with sharp, deep, close set, spiral grooves minutely punctate 

 at bottom ; whorls three, beside the prominent, polished, smooth, 

 globular, sinistral nucleus; suture distinct, not channelled; outer 

 lip thin, simple ; body with a thin wash of callus; pillar short, thin, 

 very much twisted, so that its outer edge presents a plait-like appear- 

 ance, while the shell seems almost canaliculate, though the pillar is 

 continuous with the basal margin ; above the twisted edge and 

 separated from it by a deep channel is a second less prominent 

 plait ; altitude of shell, 3 ; diameter, 2 mill. (Dall). 



West coast of Patagonia, 122 fms. (Albatross). 



A. curiulus Dall, Proc. U. S. Nat. Mus. xii, p. 296, 1889. 



This little shell is mostly comprised in the last whorl and appears 

 mature. It recalls Stilifer, or a small snow-white Pedipes, as much as 

 anything, and is different from any recent species of the group I have 

 ■seen. (Dall). 



A. BULLATus Gould. PI. 49, figs. 10, 11. 



Shell small, thin, smooth, whitish, covered with a most delicate 

 straw colored epidermis. The whole surface is marked with regularly 

 arranged, deep, linear, revolving grooves, of which there are about 

 five on the upper whorls, and about sixteen on the principal whorl. 

 In some parts the furrows seem to be crossed by delicate bars. The 

 interspaces are flat. There are five whorls, which have a distinct, 

 square shoulder; the large whorl is tumid, the upper one plane. 



