SUTER : ON NEW ZEALAND PATELLID^. 349 



Subsp. affinis, Reeve. 



Patella affinis, Reeve : Conch. Icon., vol. viii, fig. 108 (1855). 

 Nacella Earli, Hutton : Cat. Mar. MoU. N. Zeal., p. 45 (1873), not 



of Reeve. 

 Selcioniscus affinis, Pilsbry : Man. Conch. (1), vol. xiii, p. 140, 

 pi. Ixix, ifigs. 32, 33, 



Distinguished from the species by its smaller size, the elongated 

 oval form, the numerous simple, smooth, slightly waved radiate ridges 

 and strige. The typical, close, divaricating colour-pattern is not always 

 present, sometimes there are only brown radiate bands visible, which, 

 especially in Chatham Island examples, coalesce, forming broad dark- 

 brown or black patches. The concentric striation is mostly very 

 distinct. A large specimen has the following dimensions: — Length 33, 

 breadth 33, height 7 mm. 



Hal. — I have specimens from Stonyhurst, Te Onepoto, Preservation 

 Inlet, and from the Chatham Islands. It seems to be very local in 

 its distribution. 



Subsp. ^«i-«, Hutton. 



Patella flava, Hutton: Cat. Mar. Moll. N. Zeal., p. 44 (1873). 

 Helcioniscus flaviis, Pilsbry: Man. Conch. (1), vol. xiii, p. 142. 



This subspecies is best described as a conical, pale yellow form of 

 decora, Phil. The apex is subcentral, sometimes nearly reaching the 

 anterior third of the length. Small shells are, as a rule, depressed, 

 but adult individuals have mostly a high conical form. The distant 

 broadly -rounded ribs niimber 20 to 22, and are almost always of the 

 same colour as the shell ; specimens from Stonyhurst have, now and 

 again, one or several ribs dark brown. Interior light to orange 

 yellow, iridescent, central area cream to light orange colour. To 

 show the variability in form I give here the dimensions of specimens 

 from three dilferent localities : — 



Kaikoura, South Island 



Stonyhurst, ,, 



Napier, North Island 

 j> )) 



I examined the radula of several specimens, and found the dentition 

 the same as in the species. The gill cordon is interrupted in front. 



Hab. — My collection contains specimens from Kaikoura, Stonyhurst, 

 Motanau Island, South Island; Napier and Gisborne, North Island; 

 Chatham Islands. 



Subsp. olivacea, Hutton. 



Patella olivacea, Hutton: New Zeal. Journ. Sci., vol. i (1882), p. 69. 

 Helcioniscus olivaceus, Pilsbry: Man. Conch. (1), vol. xiii, p. 141, 

 pi. Ixx, figs. 46-48. 



