516 REVISION OF THE RECENT LAMELLIBRANCHIATA OF N. Z., 



Mvodora crassa. Stutchburyi, Zool. Jour., V.p. 100, tab. Supp. 

 43, figs. 5-6 ; Reeve, Conch. Icon., fig. 1. 



Habitat.— Stewart's Island. (C. Traill). 



I have not seen this species. It is found also in Australia. 



This species is l'emarkable for its solidity, and its left valve being 

 less flattened, or concave, than in other species of the genus (Smith, 

 1. c, p. 581). 



Myodora neozelanica. Smith, ( Novce-zealandice), Pro. Zool. 

 Soc, 1880, p. 584, pi. 53, fig. 5. 



Habitat. — Stewart's Island. 



More equilaterally triangular than any other species in the 

 genus, and remarkable for the abrupt termination of the concentric 

 grooves on the right valve, the smooth posterior dorsal area, and 

 particularly for the two divergent impressed rays within both of 

 the valves or radiating from the umbones as far as the pallial 

 impression (Smith). 



Mvodora subrostrata. Smith, Pro. Zool. Soc, 1880, p. 584, 

 pi. 53, fig. 6. M. ovata. Hutton, Man. Moll, of New Zea- 

 land, p. 137 [not of Reeve]. 

 Habitat. — Auckland and Stewart's Island. 



More broadly and deeply sulcated than M. striata, and of a 

 different form, the hinder dorsal slope being straighter, and the 

 anterior more curved. The right valve has not the elevated and 

 strongly sculptured hinder marginal ridge which is characteristic of 

 that species (Smith). 



Myodora antipodum. Smith, Pro. Zool. Soc, 1880, p. 585, 

 pi. 53, fig. 7. 



Habitat — Auckland (Col. Bolton). 



I have not seen this species. 



Shell transversely elongated, but differs from M. pandoriformis 

 in the front dorsal margin being straight, in being more inequi- 

 lateral and in the right valve being more convex. From M. boltoni 

 it differs by the broader posterior truncated end, and the fact of 

 the hinder dorsal slope being longer than the anterior. (Smith.) 



