412 
ACTINOPTERYGII. 
41079. Another fine specimen of the anterior border of the pectoral 
fin; Chalk, Merstham, Surrey. 
Presented by Prof. N. S. Maslcelyne, 1868. 
35554. Anterior portion of similar fin ; Gault, Folkestone. 
Purchased , 1859. 
46961. Fragment of still larger pectoral; Lower Chalk, Burham, 
Kent. Purchased, 1876. 
P. 1480. Two fragments of similar fin ; Chalk, Lewes. 
Egerton Coll. 
4070. Fra gment with more widely spaced anterior eminences, de¬ 
scribed and figured by Agassiz (op. cit. vol. iii. p. 58, 
pi. s. a. fig. 2) under the name of Ptychodus arcuatus , and 
also figured by Mantell (op. cit. pi. xl. fig. 3); Upper 
Chalk, Lewes. Mantell Coll. 
P. 7254-55. Small fragments apparently of similar fins; Cambridge 
Greensand. Jesson Coll. 
4075. Anterior portion of more delicate pectoral fin, with less pro¬ 
minently sinuous margin, described and figured by Agassiz 
(op. cit. p. 58, pi. x. a. fig. 4) under the name of Ptychodus 
gibberulus ; Chalk, Lewes. Mantell Coll. 
49747-48. Two fragments of similar fins; Lower Chalk, Southeram, 
Lewes. Capron Coll. 
41695. Fine fin showing a basal bone; Chalk, Kent. 
Toulmin Smith Coll. 
39066. Similar but more imperfect fin ; Chalk, Harisham, Kent. 
Bowerbanlc Coll. 
33176. Two fragments of similar fin ; Chalk, Burham. 
Purchased , 1857. 
36092-93, 47280. Three imperfect specimens of similar fin; Lower 
Chalk, Dorking, Surrey. 
Purchased , 1861, and Gardner Coll. 
49733. Fine fin and another small specimen ; Dorking. 
Capron Coll. 
49029-30. Two similar specimens; English Chalk. 
Mrs. Smith’s Coll. 
