PLATE 45. 
Page 
Fig. 1. Merista (= Meristella), species undetermined. 252 
This species, of the size of 1 a and more rarely of 1 b, c, occurs in considerable numbers in 
the Upper Pentamerus limestone, and 1 d has the same form and proportions; but I have 
not been able to determine fully its relations to the other species described, or whether it 
may be the extreme young of M. princeps. 
Fig. 2 a - p . Henssel^eria mutabiias. 254 
2 a, b. Dorsal and profile views of a young specimen. 
2 c. Dorsal view of a large specimen, where the beak is scarcely incurved. 
2 d, e,f, g. Specimens presenting the ordinary characters of the species. 
2 h, i. Dorsal and profile views of a more elongated form, which is slightly wider towards the 
upper part of the shell. 
2 k. I, -in. Dorsal, profile and front views of a very gibbous specimen. 
2 n, o, p. Views of specimens which are much broader towards the upper part of the shell, 
very gibbous, and having the beak closely incurved. 
Fig. 8 a - g . K.ENSSEL2ERIA A3QUIRADIATA. 255 
3 a, b, c. Dorsal, ventral and profile views of a large specimen, which is proportionally longer 
than the prevailing forms. 
3 d. Front view of the same. 
3 e,f,g. Dorsal, ventral and front views of a larger specimen, which has a proportionally 
greater breadth than the preceding. 
Fig. 4. RensseljEria elliptica. 256 
4 a, b. c. Dorsal, profile and front views of the same specimen. 
