PACHYCORMIDZE. 
411 
P. 7257. Pour expanded haemal bones doubtfully ascribed to this 
genus ; Cambridge Greensand. Jesson Coll. 
P. 7258. Ten expanded haemal bones doubtfully ascribed to this 
genus, deeper than the preceding specimens and some 
exhibiting feeble vertical flutings ; Cambridge Greensand. 
Jesson Coll. 
30259, 35160, 35394. Eight expanded haemals; Cambridge Green¬ 
sand. Purchased , 1855, 1859. 
P. 7256. Other still more deeply expanded haemals of the form 
provisionally ascribed to this genus by W. Davies, Geol. 
Mag. [2] vol. v. p. 256; Cambridge Greensand. 
Jesson Coll. 
35160 a, 35351. Two similarly expanded haemals, imperfect but dis¬ 
playing slight vertical furrows ; Cambridge Greensand. 
Purchased , 1859. 
47191, P. 38. Two small expanded haemals of similar form ; Gault, 
Eolkestone. Gardner Coll. 
49102. Imperfect large example of similarly expanded haemal 0*125 
in depth ; Chalk, Kent. Mrs. Smith’s Coll. 
38027. Smaller specimen ; Chalk, Lewes. Purchased , 1863. 
P. 5120. Still smaller specimen ; Neocomian, Choroskowo, Kussia. 
Purchased , 1886. 
P. 1483. Small expanded haemal overlapped by caudal fin-rays; 
Chalk, Sussex. Egerton Coll. 
4074, 4099. Two fragments of pectoral fins showing wavy anterior 
border, described and figured by Agassiz (Poiss. Foss, 
vol. iii. 1837, p. 57, pi. x. a. figs. 1, 3) under the name of 
Ptychoclus spectdbilis; Upper Chalk, Lewes. The first 
specimen is also figured by Mantell (Geol. Sussex, 1822, 
pi. xxxix.) as “ a dorsal fin, or radius , of a fish allied to 
the genus Balistes.” Mantell Coll. 
39471. Larger portion of a similar fin ; English Chalk. 
Bowerbank Coll. 
35374. Small fragment of similar fin ; Chalk, Cambridge. 
Purchased , 1859. 
