65 
tion in the gili; foot and mantie sutures as in Gaimardia. 
Shell orbicular, with a dictinct rostrum; hinge teeth of the 
cyrenoid type, strong; ligament short, internal. 
Neogaimardia n. gen. 
Type: Kellia rostellata Ta te. 
A comparison of the hinge elements makes it evident that in this 
family the two chief types of Bernard are manifested. I have 
Fig. 15. 
Hinge of Gaimardia acrobeles. 
Fig. 16. 
Hinge of Kiddena Incolor. 
Fig. 18. 
Three stages in 
Fig. 17. Fig. 19. 
the development of the shell and hinge of Neogaimardia rostellata. 
examined the hinge in G. faha and G. acrobeles (text-fig. 15) — in 
the latter it is rather well developed — and in both there is only 
One small Cardinal in the left valve being the ventral one in the 
hinge and thus = 2, according to Bern ard’s nomination; it is sur- 
Vidensk. Medd. fra Dansk naturhist. Foren. Bd. 77. 5 
