PLATE 44. 
Page 
Fig. 1 - 5. Merista ( = Meristella? ) princeps. 251 
1 a, b; 2 a. b, and 8 a, b. c. Ventral, dorsal, profile, and front views of young individuals, 
where the sinus is scarcely defined beyond the front, and there is no mesial fold on the 
dorsal valve. These specimens preserve so much the character of Merista taxis, that 1 
have some hesitation in placing them under this species; but they are more extended in 
front, and the outline less regularly curved. 
4 a, b, c, d. Dorsal, ventral, profile and front views, in which the characteristic features of the 
species are fully developed. 
4 e,f, g, h. Views of a specimen of extremely large size, showing the broad and shallow 
mesial sinus, and the linguiform extension in front, which is bent abruptly upwards. 
5 a, b, c, d. Views of a specimen having the form of the two preceding, but with a narrower 
and more angular sinus. 
Fig. 6 a , b, c, d. Merista meeici. 252 
G a, b. Ventral and dorsal views of this species. 
6 c, d. Profile and front views of the same. 
