Cantharidus.] GASTROPODA. 125 



3. Cantharidus pruninus, Gould, 1849. Plate 39, fig. 5. 



Trochus pruninus, Gld., Proc. Bost. Soc. N.H., iii, 90, 1849 ; Expl. Exp. 

 Moll., ISO, atlas f. 205. Cantharidus pruninus, Gld., Man. Conch. (1), 

 xi, 122, pi. 46, f. 60, 61 ; Suter, P. Mai. S., ii, 268. Trochus capillaceus, 

 Phil.. Zeitschr. f. Mai., 1848, 102. T. vpiscopus, Hombr. et Jacq., Voy. 

 P.S.,pl. 14, f. 9-11. 



Shell ovate-conical, imperforate, nearly smooth, deep purple. 

 Sculpture consisting of very fine dense spiral striae, leaving narrow 

 and shallow grooves between them, sometimes nearly obsolete. Colour 

 deep purple or reddish-grey, sometimes with a few white dots, apex 

 usually pink. Epidermis thin, often shining, easily rubbed off. Spire 

 conical, sides slightly convex, apex subacute. Protoconch conoidal, 

 consisting of 3 convex spirally striate whorls. Whorls 6 to 7, slightly 

 convex, the last rounded or obtusely angular ; base flatly convex. 

 Suture linear, slightly impressed. Aperture less than one-half the 

 length of the shell, ovate, oblique, iridescent within, lirate. Outer 

 lip convex, effuse on meeting the basal lip, with a sharp, finely den- 

 ticulate edge. Columella subvertical, with a slight swelling in the 

 middle. Inner lip expanded in a callous pad over the umbilical tract ; 

 a thin callus on the parietal wall. 



Diameter, 16-19 mm ; height, 19-30 mm. 



Type in the U.S. Nat. Museum, Washington. 



#a&. Auckland and Campbell Islands. The type is from the 

 former. 



.Subsp. perobtusus, Pilsbry, 1889. Plate 39, fig. 6. 



Cantharidus pruninus, Gld., subsp. perobtusus, Pils., Man. Conch. (1), xi, 

 123, pi. 34, f. 1 ; Suter, P. Mai. S., ii, 269. 



Spire short, very obtuse at apex ; whorls 5, the last large, de- 

 scending anteriorly ; aperture as long as spire ; other characters as in 

 C. pruninus. 



Diameter, 19 mm. ; height, 20 mm. 



Type in the collection Acad. Nat. Sci., Philadelphia. 



Hob. Auckland, Campbell, and Macquarie Islands ; Sandfly Bay, 

 Otago Peninsula (T. Iredale). 



Var. minor, E. A. Smith, 1902. Plate 38, fig. 13. 



Cantharidus pruninus, GUI., var. minor, E. A. Smith, Voy. " Southern 

 Cross," Moll., 207. 



Shell much smaller than the species ; not a quarter the size of other 

 examples from the Auckland Islands. In form, colour, and sculpture, 

 however, they are quite similar. 



Diameter Maj., 6f mm. ; min., 6 mm. : height, 8 mm. 



Type in the British Museum. 



Hob. Auckland Islands, in 10 fathoms (type) ; Campbell Island. 



