208 ACTIXOPTEKYGII. 
P. 3749. Vomerine dentition with comparatively narrow median 
teeth ; Coral Rag, Lindnerberg, Hanover. 
Enniskillen Coll. 
P. 5950. Vomer, partly fractured, showing some of the unworn 
rugose teeth; Coral Rag, Holzen, Eschershausen. 
Purchasedl, 1889. 
P. 7438. Fragments of two large vomers; Himmeridgian, Lan- 
genberg. Purchased , 1895. 
P. 5951. Right splenial; Holzen. Purchased, 1889. 
P. 7436. Associated splenials ; Langenberg. Purchased , 1895. 
Mesodon granulatus (Munster). 
1846. Pycnoclus granulatus , G. von Munster, Beitr. Petrefakt, pt. vii. 
p. 44, pi. iii. figs. 11, 12. 
1846. Pycnodus jugleri, G. von Minister, ibid. p. 42, pi. iii. figs. 8-10. 
[Fragments of dentition ; Palaeontological Museum, Munich.[ 
(P) 1846. Pycnodus nicoleti, G. von Miinster {errore), ibid. p. 42. 
1858. Pyknodus granulatus, F. A. Quenstedt, Der Jura, p. 782, pi. xevi. 
fig. 20. 
1875. Mesodon granulatus, K. Fricke, Palaeontogr. vol. xxii. p. 359, 
pi. xviii., pi. xix. figs. 1-5. 
(?) 1880. Mesodon granulatus, H. E. Sauvage, Bulk Soc. Geol. France, 
[3] vol. viii. p. 528, pi. xix. fig. 3. 
Type. Detached teeth ; Xatural History Museum, Berlin. 
A large species, imperfectly known. External bones and scales 
ornamented with very coarse granulations. Teeth feebly rugose, 
those of the lateral series with an apical pit, and soon becoming 
smooth by abrasion : outline of teeth often irregularly rounded. 
Vomerine teeth sparsely arranged, those of the median series con¬ 
siderably broader than long, and their breadth equalling or slightly 
exceeding that of the two lateral series. Splenial teeth more 
closely arranged, those of the principal series often twice as broad 
as long, flanked within by one row of small round teeth and ex¬ 
ternally by three series, of which the median is the smallest (some¬ 
times partly duplicated) and the outer about equal in size to the 
inner series. 
This definition is based upon the researches of Fricke. 
Form. § Loc. CoraRian and Kimmeridgian: Hanover, Wurtern- 
berg, S. England, and (?) H. France. 0 ' 
P. 1655. Portion of left splenial dentition ; Corallian, Lindner¬ 
berg, Hanover. Egerton Coll. 
