Cantharidus.] GASTROPODA. 129 



a broad white opaque band ; interior pearly. Aperture quadrangular. 

 Columella nearly vertical, with a slight swelling in the middle. Im- 

 perforate. 



Diameter, 5 mm. ; height, 7-5 mm. 



Type in my collection. 



Hob. Lyall Bay (A. Hamilton). 



8. Cantharidus tenebrosus, A. Adams, 1853. Plate 38, fig. 15. 



Cantharidus tenebrosus, A. Ad., P.Z.S., 1851 (1853), 170; Man. Conch. (1), 

 xi, 123. pi. 34, f. 3 ; Suter, P. Mai. S., ii, 269. 



Shell conical, elevated, imperforate, rather thick, solid, spirally 

 lirate. Sculpture consisting of fine and distant spiral lirae, 6 to 7 on 

 the penultimate, 12 to 16 on the body whorl, crossed by fine close 

 growth-lines. Colour dark-bluish or greenish-black, sometimes with 

 a purplish shade. Epidermis dull, not very easily rubbed off. Spire 

 elevated conical, apex acute or obtusely rounded, sides flatly convex. 

 Protoconch small, conic, of about 2 smooth and convex whorls, mostly 

 eroded. Whorls about 6, very slightly convex, body-whorl subangular 

 at the periphery ; base very slightly convex. Suture slightly im- 

 pressed. Aperture rounded quadrate, oblique, less than half the total 

 length of the shell, slightly iridescent and lirate within. Outer lip 

 convex, subangled at the base, narrowly black-edged, bordered by a 

 series of short fine sulcations, beyond which there is a porcellanous 

 thickening. Columella subvertical, slightly arcuate, rounded, covering 

 the umbilicus above ; parietal wall with a very thin whitish callosity. 



Diameter, 9-5 mm. ; height, 11-5 mm. 



Dentition. Hutton, T.N.Z.I., xiv, 166, pi. 7, f. L. 



Type in the British Museum. 



Hob. Throughout New Zealand, mostly on seaweeds. 



Fossil in the Pliocene and Miocene. 



Subsp. Huttoni, E. A. Smith, 1876. Plate 38, fig. 16. 



Trochus (Cantharidus) Huttoni, E. A. Smith, J.L.S., xii, 558, pi. 30, f. 20. 

 Cantharidus tenebrosus, A. Ad., subsp. Huttoni, E. A. Smith, Man. Conch. 

 (1), xi, 123, pi. 34, f. 2; Suter, P. Mai. S., ii. 269. Gibbula plumb f a, 

 Hutton. J. de Conch., 1878, 33. 



Shell short-conical, covered perforate, bluish-black, spirally lirate. 

 Sculpture consisting of close spiral lirae, 8 to 11 on the penultimate, 

 17 to 20 on the body whorl, crossed by fine growth-lines. Colour 

 bluish or purplish black, the apex mostly worn white. The inner 

 lip is more expanded than in the species, completely covering the 

 perforation. All the other characters are the same as in C. tenebrosus. 



Diameter, 7-10-5 mm. ; height, 10-5-14-5 mm. 



Dentition. Hutton, T.N.Z.I., xiv, 165, pi. 7, f. M. 



Type in the British Museum. 



Hob. The same as the species, but more abundant. 



5- Moll. N.Z. 



