Cantharidus.] GASTROPODA. 131 



umbilicus, sometimes, however, obsolete ; distant impressed con- 

 centric grooves on the base. Colour white, with longitudinal undu- 

 lating or zigzag pinkish or purplish lines, often uniting to form spots 

 at the periphery, or prominently angled there. Spire elevated, narrow, 

 sides straight. Protoconch small, consisting of 2 convex and nearly 

 smooth whorls, mostly eroded. Whorls about 7, convex, more or 

 less carinated at the periphery, the carina exserted above the suture 

 on the spire ; base convex. Suture margined. Aperture oval. Outer 

 lip thin. Columella thin, arcuate, not truncate. Inne Up slightly 

 expanded above, but not covering the umbilicus. 



Diameter, 5-7 mm. ; height, 8-12 mm. 



Animal with a very large thin mantle ; the tentacles are large 

 and very long, strongly ciliated with a long deep posterior channel 

 running down their whole length. The eyes are very minute, on the 

 end of rather long and fine tubercles. There are 4 pedal appendages 

 on the right and 3 on the left, side, and there are also the 2 head-lappets 

 common to Trochus. The teeth are like those of Margarita (Watson) 



Type in the British Museum. 



Hob. Stuart Island (Stewart Island ?), New Zealand. Australia. 



I have not seen any New Zealand specimens. 



Subgen. 3. THALOTIA, Gray, 1847. 

 Thalotia, Gray, P.Z.S., 1847, 145. Type : Monodonta conica, Gray. 



Shell imperforate, elevated conical, thick, solid, granulated or 

 spirally ribbed ; periphery rounded or obtusely angular ; aperture 

 small, ovate ; outer lip thick, crenulated within ; columella toothed 

 at base, subtruncated. 



11. Cantharidus conicus, Gray, 1827. Plate 39, fig. 8. 



Monodonta conica. Gray, in Captain King's " Survey of Australia," ii, 479. 

 Cantharidus conicus, Gray, Man. Conch. (1), xi, 141, pi. 46, f. 73 ; Suter, 

 P. Mai. S., ii. 275. Thalotia pictus, Wood, Index Test, Suppl., pi. 5, 

 f. 28; A. Adams, P.Z.S., 1851 (1853), 172. Monodonta turrita, Menke, 

 Moll. Nov. Holl., 15. Thalotia Lehmanni, Kiener, Spec., g. Trochus, 

 pi. 46, f. 2, not of Menke. T. Woodsiana, Angas, P.Z.S., 1872, 611, 

 pi. 42, f. 4, 5. T. dubia, T.- Woods, P.R.S. Vic., xiv, 58. T. Troschelii, 

 Philippi, Conch. Cab., 131, pi. 23, f. 2. 



Shell elevated conical, imperforate, solid. Sculpture : Whorls of 

 spire encircled by 5 or 6 more or less granose lirfe, last whorl with about 

 13 or 14 ; growth-wrinkles more or less prominent, very distinct upon 

 the base. Colour pinkish or greyish-white, with crimson apex and 

 numerous close longitudinal dark-reddish-brown stripes, often cut 

 into tessellations by the spiral grooves of the surface. Epidermis 

 rather thin, dull, mostly rubbed off on the upper whorls. Spire 

 straightly conical. Protoconch pink, bluntly conical, eroded. Whorls 

 about 7, nearly planulate, the last obtusely angular at the periphery ; 

 base flatly convex. Suture linear, not much impressed. Aperture 



