ACT.1"V 



Station HvMO fms. (g .:!' and / 



53'), iii 11!) fms.; Station 290, o// i;<irf>'i<In.<, in TM fms., coral, 

 temperature 70 75,F ; and Slniinu KM), o//' Mow, IJ</l>f 

 Ham n<i, in L ; f)0-400 fms.; Off Point Uallegoa, eastern J'<tt<i'/<>,n<i, in 

 fms. 



A.fasciatusf DALL, Bull. M. C. Z. ix, p. 94, 1881, not of Lum- 

 arck. ,4. ili'Hcatns DALL, 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. 

 < 'mningii 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. CUKTULUS Ball. 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. (Da//). 



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



A. curtulus 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 Stiflfer, or a small snow-white /V^/rx, 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 moat 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 -ixtccn on the principal whorl. 

 In some parts the furrows seem to be crossed l>y delicate bars. The 

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

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



