82 
ACIINOPTERrGII. 
28013. Fragment and vertical microscopical section of the same; 
Cambridge Greensand. Purchased. 
3 0259. Another fragment and similar section ; Cambridge Green¬ 
sand. Purchased, 1855. 
P. 7. Imperfect specimen rather broad at the concave end, described 
and figured, loc. cit. p. 356, pi. xiii. fig. 4; Gault, 
Folkestone. Gardner Coll. 
P. 8. Fragment; Gault, Folkestone. Gardner Coll. 
46392. Frag ment, with horizontal and vertical microscopical sections 
of the same; Chalk, S, Wiltshire. Cunnington Coll. 
25923 Fra gment, probably from the Sussex Chalk. Diccon Coll. 
39052. Fragment; Lower Chalk, Burham, Kent. Bowerhanlc Coll. 
(ii.) U]pper dental plates. 
38585. Specimen showing bony attachments, described and figured 
loc. cit. p. 355, pi. xiii. fig. 2 ; Lower Chalk, probably 
Kent. Beferred to Thryptodus sp., by F. B. Loomis, 
Palaeontogr. vol. xlvi. (1900), p. 235. Purchased, 1864. 
-39091. More imperfect specimen, the aboral face described and 
figured loc. cit. p. 356, pi. xiii. fig. 3 ; Lower Chalk, near 
Maidstone. Beferred to Thryptodus sp. by F. B. Loomis, 
Palaeontogr. vol. xlvi. (1900), p. 235. BoiverhanJc Coll. 
P. 9014. Imperfect specimen displaying abraded aboral face; 
probably from Lower Chalk, Kent. Purchased, 1885. 
43079. Fragment showing structure ; Lower Chalk, Hailing, Kent. 
Purchased, 1871. 
39092. Fragment; Chalk, Gravesend. Bowerhank Coll. 
P. 2692. Portion of large specimen ; Lower Chalk, Lewes. 
Enniskillen Coll. 
5277. Fragment; Lewes. Mantell Coll. 
P. 7277. Two imperfect abraded specimens ; Cambridge Greensand. 
Jesson Coll. 
47188. Fragment in concretion; Gault, Folkestone. Gardner Colh 
