242 
ACTING PTERYGII. 
P. 6168. Two fine right splenials figured by Damon, op. cit. pi. xi. 
figs. 1, 7, and also a left splenial; Weymouth. 
Demon Coll. 
P. 6164. Imperfect right splenial, figured ihid. pi. xvii. fig. 9 ; said 
to have been obtained from the Coral Dag, near Sandsfoot, 
Weymouth, but probably from the Kimmeridge Clay. 
Damon Coll. 
43559. Small elongated left splenial ; Weymouth. 
Purchased , 1872. 
40638-39, 41176, 44087. Four small right splenials ; Weymouth. 
Purchased , 1867-68, 1873. 
P. 1614. Small right and left splenials, the latter exhibiting an 
irregular supplementary row of small teeth within the 
innermost series ; Weymouth. Egerton Coll. 
P. 3786 ,-a. Small right and left splenials, and a very diminutive 
specimen of the left side ; Weymouth. Enniskillen Coll. 
P. 346. Very small left splenial, with supplementary inner teeth; 
Weymouth. Purchased , 1881. 
P. 6151 a. Pair of very small splenials ; Weymouth. Damon Coll. 
P. 3786 b. Abnormal right splenial, doubtfully of this species, with 
relatively small principal teeth and two large inner series; 
Weymouth. Enniskillen Coll. 
The following specimens do not differ much from the dentition of 
Gyrodus cuvieri :— 
40468, 40471-72. Portion of a large vomer, and a large and 
small splenial, much abraded ; Neocomian (derived 
fossils), Potton, Bedfordshire. Purchased , 1867. 
40467. Two anterior prehensile teeth; Potton. Purchased, 1867. 
Gyrodus minor, Agassiz. 
1829. 11 Jaw-bone and teeth of a Reptile,” J. Phillips, Geol. Yorkshire, 
p. 124, pi. ii. fig. 55. 
1833-44. Gyrodus minor , L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 16, 
pt. ii. p. 234, pi. lxix. a. fig. 14. 
(?) 1844. Pymodus minor , L. Agassiz, ibid. pt. ii. p. 200 (name only). 
Type. Imperfect splenial dentition. 
A species known only by the splenial dentition, which closely 
resembles that of G. cuvieri, but appears to have the teeth more 
