SHELLS. 249 



Fam. VENERID^E. 



1 56. Arthemis subrosea, Gray. Yale's New Zealand, App. 

 Inhab. New Zealand, East Coast. Yate. 



Shell orbicular, rather convex, opake-white, rosy-purple on the 

 umbones, with close, regular, minute, concentric grooves, crossed 

 by a few very obscure radiating striae, lunule short, cordate, inside 

 white, disk opake. Var. Lunule rather smaller. 



Live sunk 9 inches in the sand, and are only to be got at spring- 

 tides. They are not common, and only to be procured by industry. 



157. Arthemis Australia. Venus Australis. Quoy et 

 Gaim. Voy. Astrol. iii. 528, t. 84, f. 11-12. 



Inhabits New Zealand. Quoy. 



158. Dosina Zelandica. Gray. Yale's New Zealand, 

 App. 



Inhab. East Coast. Yate. 



Shell ovate-cordate, ventricose, solid, brown, with close, regular, 

 slightly elevated concentric laminae, which are higher at each 

 end ; lunule large, ovate- cordate, inside dead- white ; hinge margin 

 moderate ; hinder slope simple, without any flat shelving space 

 on the left valve. 



Very like D. rugosa, but the ridges are thinner, closer, the shell 

 more oblong, the hinge margin thinner, and the lunule much 

 longer and narrower in proportion. 



The Dosince have a small anterior additional tooth on the hinge 

 margin. Lamarck refers them to Venus ; they are intermediate 

 between Venus and Cytherea. 



159. Dosina oblonga. 



Inhabits New Zealand; between stones in mud, or 

 rather gravel. 



Shell oblong, cordate, white with a few red rays near the umbo ; 

 very slightly radiantly striated, with numerous narrow, close, 

 rather regular, high rounded edged concentric ridges, which are 

 rather more laminar at each end ; lunule cordate. 



The edge is very finely crenulated, and the folds on the front 

 side of the shell are rather crenulated by the radiated striae, but all 

 the rest of the shell is nearly smooth ; the inside is white ; the 

 anterior lateral tooth is distinct but small. Varies in being rather 

 more attenuated and produced behind. 



