70 LAMELLIBRANCHIATA. 



striate. Pale yellowish or brown, purplish at the umbonea. Height, 

 1-8 ; length, 2'1. 



Common on the coasts of the North Island, and Massacre Bay. 



The Natives call this shell " pukauri." 



60. C. COStata, Quoy, I.e., Hi., p. 521. Oval, swollen, inequi- 

 lateral, rugose, truncated behind ; with thick radiating ribs crossed by 

 concentric striae. White, sometimes yellowish on the umbones ; interior 

 white, with the apex, and generally the posterior end, purple. Height, 

 1-2 ; length, T55. 



Common. 



The Natives call this shell " kaikai-kororo." 



* 61. C. lima, Deshayes, I.e., p. 137. Oval, sub-quadrate, pale, 

 sparingly variegated with brown, radiately ribbed ; ribs rounded, ser- 

 rated, concentrically ridged, ridges on the ribs acuminate ; dorsal 

 margin lined with brown, slightly declining, in front greatly declining ; 

 lunule impressed, fulvous ; ventral margin rounded. (Deshayes.*) 



New Zealand (Sowerby). 



62. C. StUCllburyi, Gray, Dieff. N.Z., ii., p. 250; Venus zea- 

 landica, Quoy, I.e., iii., p. 522. Ovato-cordiform, sub-trigonal, swollen, 

 thick, radiately ribbed, and with distant concentric lamellae, which are 

 higher on the anterior end ; posterior end smooth, both the ribs and the 

 lamella? obsolete ; pallial sinus short, broad, trigonal ; hinge plate 

 curved and strongly sinuated ; lunule not margined. Reddish brown, 

 paler behind, interior bluish white, with more or less dark purple on 

 the posterior end. Height, 1'75 ; length, 2. 



Common. Chatham Islands. Kerguelan's Land. 

 The Natives call this shell " huai " or " pipi." 



63. C. dieffenbachi, Gray, Dieff. N.Z., ii., p. 250. Ovato- 

 cordiform, sub-trigonal, swollen, thick, radiately ribbed, and with 

 distant concentric lamellae, which are higher at the anterior end ; 

 posterior end nearly smooth ; pallial sinus short, broad, trigonal ; 

 hinge plate nearly straight ; lunule not margined. Pale yellowish 

 brown ; interior yellowish, with more or less purple on the posterior 

 end. Height, 175 ; length, 2. 



Common. 



Perhaps only a variety of the last, but the ribs and lamellae are 

 stronger, and there is less purple in the interior. 



64. C. crebra, sp. nov. Ovato-cordiform, sub-trigonal, very thick, 

 swollen, with rather close concentric striae, which are crenulated at the 

 anterior end by fine transverse striae ; posterior end truncate ; umboues 

 large, much curved forwards ; lunule cordate, pallial sinus short, broad, 

 trigonal, deeply margined. Brown ; interior white. Height, 175 ; 

 length, 1'9. 



65. C. meSOdesma, Quoy ; Venus mesodesma et crassa et den- 

 ticulata et violacea, Quoy, I.e., iv. ; V. spissa, Desliayes, Anim. sans vert. 

 vi.,p. 373 ; V. spurca, Sowerby. Ovate, sub-trigonal, rather compressed, 

 sub-equilateral, longitudinally grooved ; lunule lanceolate. White or 

 brown, with radiating bands or zig-zag lines of brown, or purplish 



