Cantltnriditx. } 



GASTROPODA. 



123 



KEY TO SPECIES. 



A. Spiral sculpture not conspicuous, subobsolete. 



a. Shell large, height to 45mm., obsoletely distantly grooved, 



whitish, with longitudinal zigzag markings of purple . . opalus. 



act. Finely densely spirally striate to nearly smooth. Deep 

 purple, apex pink. Aperttire less than half the length 

 of shell . . . . . . . . . . pruninus. 



aaa. Small, with fine spiral striae, last whorl expanded. Aper- 

 ture half the length of shell . . . . - . dilatatus. 



B. Spiral scxilpture very conspicuous. 



a. Spiral cinguli adorned with fine spiral striae, growth-lines 



lamellose striate . . . . . . . . purpuratiis. 



aa. Spiral cinguli smooth or slightly beaded, growth-lines fine 



and close. 

 b. Spire conical, elevated. 



c. Cinguli sometimes moniliform. grooves narrow ; 



greenish or white, with red spots on cinguli . . sanguinetis, 

 cc. Distantly spirally lirate ; bluish or greenish black, 



no colour-markings . . . . . . tenebrosus. 



bb. Spire depressed conical. 



c. Globosely conical ; white, with pinkish-brown 



cinguli. Last whorl rounded . . . . rufozona. 



cc. Depressed conical, whorls a little shouldered, 

 cinguli flat and broad, grooves deep ; cinereous, 

 with white and red colour-markings. Last 

 whorl angled . . . . . . . . pupittus. 



1. Cantharidus dilatatus, Sowerby, 1870. Plate 33, fig. 5. 



Eltnchus dilatatus. Sow., P.Z.S., 1870, 251. Cantharidus dilatatus. Sow., Man. 

 Conch. (1), xi, 148 (copy of Sowerby's description) ; Suter, P. Mai. S. r 

 ii, 272, fig. in text (not showing expansion of last whorl). Cbrysostoma 

 simtilata, Button, C.M.M., 36. Gibbula simulata. Butt,, M.N.Z.M., 102. 

 Cantharidus simulatus, Butt.. P.L.S. N.S.W., ix, 363. 



Shell small, conical, imperforate, spirally striated. Sculpture con- 

 sisting of numerous fine and inconspicuous spiral strise, more distinct 

 and a little further apart on the base. Colour cinereous, pink, or 

 pinkish-brown, usually with white markings near the suture or tessel- 

 lated with white ; sometimes a broad dark-brown band encircling the 

 periphery of the whorls, and 1 on the centre of the base ; white zigzag- 

 bands are sometimes adorning the last 2 or 3 whorls. Epidermis thin, 

 slightly shining, easily worn off. Spire conical, as high as the aperture, 

 a little convex, apex acute. Protoconch very small, consisting of 1-| 

 smooth slightly convex whorls. Whorls 6, slightly convex, the last 

 obtusely angled at the periphery, and considerably expanded ; base 

 flat. Suture linear, but little impressed. Aperture subrotund, oblique, 

 inside mostly highly bluish-reddish iridescent and finely lirate. Outer 

 lip strengthened by an inner white callosity. Columella vertical, con- 

 cave. Inner lip broadly expanded, covering the umbilicus, and spread- 

 ing as a broad white callosity over the parietal wall. 



Diameter, 8 mm. ; height, 8 mm. 



Dentition unknown. 



Type in the British Museum. 



