102 ICHTHYOPTEKYGTA. 



dorsals of No. 481, is the largest example. The trans- 

 verse diameter is 0,200 (7*8 inches), and the vertical 

 0,195 (7*6 inches). Saul Collection. Purchased, 1863. 



R. 277. The centrum of a middle dorsal vertebra of rather smaller 

 size than the dorsals of No. 481 ; from Lyme-Regis. 



Egerton Collection. Purchased, 1882. 



R. 316. The centrum of a considerably smaller middle dorsal 

 vertebra probably belonging to this species ; from Lyme- 

 Regis. The general contour is very similar to the centrum 

 marked 25 in No. 481, but the length and the depth of 

 the cupping are relatively greater. These features are, 

 however, probably due to immaturity. 



EnnisJcillen Collection. 



42309. Pour adjacent centra of middle dorsal vertebrae, cemented 

 together by matrix, agreeing with the preceding specimen ; 

 from Lyme Regis. Purchased, 1870. 



R. 320. A mass of matrix containing seventeen associated centra of 

 dorsal vertebrae, apparently agreeing with the preceding 

 specimens ; from Lyme-Regis. Remains of Acrodus are 

 also shown in the matrix. Enniskillen Collection. 



R. 226. The centrum of a very large dorsal vertebra ; from Lyme- 

 Regis. This specimen, which is from the later portion of 

 the middle series, is unusually short, but this shortness 

 appears to have been increased by pressure. 



Purchased, 1882. 



R. 315. A centrum agreeing very closely in size with No. R. 277, 

 but rather later in the series ; from Lyme-Regis. 



EnnisJcillen Collection. 



R. 315 a. The centrum of a posterior dorsal vertebra ; from Lyme- 

 Regis. Although somewhat smaller this specimen closely 

 resembles the centrum marked 34 in No. 481. 



EnnisJcillen Collection. 



44809. The centrum of a considerably smaller posterior dorsal 

 vertebra; probably from Lyme-Regis. The depth of the 

 cupping and the length of the centrum are relatively 

 greater than in the larger specimens. 



Presented by B. Bright, Esq., 1874. 



