204 
ACTIXOPTERYGIT. 
series of small teeth occurring on each side. Splenial teeth closely 
arranged, those of the principal series considerably broader than 
long, flanked within by one irregular row of small round teeth and 
externally by three series, of which the outermost scarcely exceeds 
the innermost in size. 
Form. Sf Log. Bathonian : Northamptonshire, Oxfordshire, and 
Gloucestershire; N ormandy l . 
38554. Imperfect large vomer ; locality unknown. 
Purchased , 1864. 
42274. Smaller vomerine dentition,less abraded; locality unknown. 
Baugh Coll. 
35498. Vomerine dentition 0*02 in length; Stonesfield Slate, Stones- 
field. Purchased , 1860. 
P. 1648 -a. Similar specimen and one smaller; Stonesfield. 
Egerton Coll. 
32550. Plaster cast of imperfect vomerine dentition; Great Oolite, 
Caen, Normandy. Tesson Coll. 
P. 3779. Small vomerine dentition described and figured by Agassiz, 
loc. cit ., as the type specimen of Gyrodus trigonus; Stones¬ 
field. Enniskillen Coll. 
P. 521. Smaller specimen noticed by Agassiz, loc. cit., and figured 
in Proc. Geol. Assoc, vol. xi. (1890), pi. iii. fig. 26 ; 
Stonesfield. Egerton Coll. 
P. 4387. Bight splenial dentition, much broken ; Stonesfield. 
Enniskillen Coll. 
1370 (Sloane Catalogue). Smaller specimen, right side; Witney, 
Oxfordshire. Sloane Coll. 
P. 1666 C. Smaller right splenial; Stonesfield. Egerton Coll. 
P. 522. Small right splenial dentition,, labelled “ Pycnodus parvus, 
Ag.,” in Agassiz’ handwriting, described and figured in 
Proc. Geol. Assoc, vol. xi. (1890), p. 299, pi. iii. fig. 23; 
Stonesfield. Egerton Coll. 
P. 3780-81. Slightly larger examples of the right and left splenial 
dentition, the first labelled “ Pycnodus latirostris , Agass.,” 
1 A very similar though not identical dentition is also known from the 
Kimmeridgian of Hanover (K. Fricke, Palseontogr. vol. xxii. 1875, p. 362, pi. six. 
figs. 6, 7). 
