ACTION. 165 



A. PERCONICUS Dall. PL 18, fig. 83. 



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

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

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

 punctate grooves in front of the suture, more distant anteriorly, and 

 a similar but more numerous and uniformly spaced series just behind 

 the pillar, behind which again are four or five widely separated 

 similar grooves the posterior near the periphery ; between them and 

 near the periphery, as well as behind it, are no grooves or but faint 

 spiral obsolete stria?; suture distinct but not channelled ; last whorl 

 much the largest; outer lip straight, simple, slightly thickened; 

 body with a moderate deposit of callus ; pillar as in A. curtulus, but 

 less strongly twisted and with the plait and recurved margin sub- 

 equal ; although the margin is continuous, there is a rather deep 

 sulcus behind the anterior end of the pillar, corresponding to a 

 groove, which bounds the columella callus; longitude of shell, 5; 

 latitude, 3 ; longitude of aperture, 3 mill. (Dall). 



Near Galapagos Is., in 812 fms. (Albatross). 



A.perconicus DALL, Proc. U. S. Nat. Mus. xii, p. 296, pi. 12, f. 7, 

 1889. 



This shell and the last species seem to stand in an intermediate 

 position between Actceon of the typical kind and Cinulia. If the 

 outer lip should eventually become much thickened, of which, how- 

 ever, there is no satisfactory evidence, these shells might be referred 

 to Cinulia. If the A. curtulus recalls Pedipes mirabilis Muhlfeldt 

 in its form and sculpture, A. perconicus recalls P. elongatus Dall. 

 (Dall). 



A. OVULUM Pfeiffer. 



Shell small, ovate, shining, white ; spire conic. Whorls 6, nearly 

 flat, the last three times the length of the spire. Columella biplicate 

 at base. Aperture entire, oblong, narrow ; lip simple, widened in 

 the middle. Length 1-66, diain. -75 mill. (Pfr.). 



Cuba. 



Tornatella ovulum PFR., Arch. f. Naturg. vi, 1840, p. 256. Actceon 

 (Actceonideaty ovulum MORCH, Mai. Bl. xxii, p. 170. 



Da!l (Blake Rep. Gastr., p. 41) remarks that this may be an im- 

 mature Marginella. 



ACTION AUSTRALIS Quoy & Gaim. (Astrol. ii, p. 317)>=Elysia, 

 in Nudibranchiata. 

 12 



