HELCIONISCUS. 141 



P. floccata REEVE, Conch. Icon., f. 106, (1855). P. radians var. 

 pholidota BUTTON, Proc. Linn. Soc. X. S. Wales, ix, p. 377, (1884). 

 The figures represent the synonymous P. floccata of Reeve. 



H. OLIVACEUS Button. PI. 70, figs. 46, 47, 48. 



Shell short-ovate, conical, the apex at about the front third ; 

 closely but subobsoletely radiately ribbed, the riblets about 70 in 

 number, and of nearly equal size; uniform olive colored. 



Interior greenish-olivaceous, iridescent, the center whitish ; edge 

 narrowly black-bordered. 



Length 33, breadth 28, alt. 14 mill. 



Dunedin to the Bluff, New Zealand. 



P. olivacea BUTTON, Trans. N. Z. Inst. xv, p. 133, (1883), 

 pi. 16, f. D (dentition). Patinella radians var. olivacea BUTTON, 

 Proc. Linn. Soc. K. S. Wales, ix, p. 377, (1884.) 



The apex is less anterior than is usually the case with P. radians, 

 and it is more erect. It is further distinguished by the uniform 

 olive color, and more equal ribbing. My illustrations are from a 

 specimen received from Prof. Button. 



This species seems quite distinct from the P. radians, of which I 

 have seen many examples. Prof. Button, however, considers it a 

 variety of that species, no doubt having good reasons for the union. 



There is a prior P. olivacea of Anton, and a still earlier P. olivacea 

 of Gmelin, but as both are totally unrecognizable, the name im- 

 posed by Button may be allowed to stand. 



B. STELLIFERA Gmelin. PI. 70, figs. 43, 44, 45. 



Shell depressed, oval, with small granular ribs ; reddish with 

 white rays at the apex, or two white lines at the posterior end. In- 

 terior white. Apex anterior. Length 25, breadth 19, alt. 7 mill. 



(Q. & G.) 



Cooks' Straits to Bank's Peninsula, New Zealand. 



Patella stellata, seu steUifera, etc. CHEMNITZ, Conchyl. Cab. x, p. 

 329, f. 1617 (1788). P. steUifera GMELIN, Syst. Nat. xiii, p. 3719. 

 P. stellularia QUOY & GAIM., Voy. Astrol. Zool. iii, p. 347, t.70, 

 f. 18-20 (1834). REEVE, Conch. Icon. f. 96. Patinella steUifera 

 BUTTON, Proc. Linn. Soc. N. S. Wales, ix, p. 378. 



Readily recognized by the central white star. 



