296 REPOKT ON ALBATROSS MOLLUSCA— DALL. 



Class G ASTROPOD A. 



Subclass ANISOPLEURA. 



Superorder EUTHYNEURA. 



Order OPISTHOBRANCHIATA. 



Suborder TECTIBRANCHIATA. 



Family ACT.FONID.F. 



Genus ACTiEON Montfort. 



Actaeon delicatus Dall. 



A. delicatus Dall, Bull. Mus. Comp. Zoo!., xvin, p. 41, PI. xvn, Fig. 5, 1889. 



This Aiitillean species was obtained atStatiou 2771, off'Point CUllegos, 

 eastern Patagonia, in 50i fathoms, sand, temperature 49°.4. This dis- 

 covery carries its known range southward nearly the whole length of the 

 continent of South America. 



Actseon curtulus sp. now 



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 channeled; 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 appearance, 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, 



On nil 



Hab. — West coast of Patagonia, at Station 2783, in 122 fathoms, mud, 

 temperature 48° F. 



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. 



Actaeon perconicus sp. nov. 



Plate xn, Fig. 7. 



Shell pear-shaped or conic, with rather acute spire, polished ivory 

 white, with four whorls beside the nucleus; transverse sculpture of in- 

 cremental lines; spiral sculpture of three to five close-set, sharp, punc- 

 tate grooves in front of the suture, more distant anteriorly, and a sim- 

 ilar but more numerous and uniformly spaced series just behind the 



