P YCX0D0NTIDJ3. 
201 
37109. Imperfectly preserved similar fish, the head in counterpart 
and displaying part of the left splenial dentition; Solen- 
hofen. There are traces of the tubercular ornament on 
the scales, and the serration of the ventral ridge-scales is 
conspicuous. Hdberlein Coll. 
P. 1628. Portion of caudal region of a somewhat larger fish ; 
Kelheim. Egerton Coll. 
37107. Small, nearly complete specimen, 0-07 in lengthen counter¬ 
part ; Solenhofen. The premaxillae are shown, and the 
course of the dorsal “ lateral line ” is conspicuous on the 
squamation to the origin of the dorsal fin. Haherlein Coll. 
Mesodon daviesi, A. S. Woodward. 
1890. Mesodon daviesi,A. S. Woodward, Proc. Zool. Soc. 1890, p. 351, 
pi. xxviii. fig. 5. 
Type. Nearly complete fish ; British Museum. 
A species attaining a length of about 0*25. Maximum depth of 
the trunk somewhat less than the length of the head and trunk 
without caudal fin; distance from frontal angulation to hinder 
margin of preoperculum scarcely exceeding one-fifth of the total 
length of the fish. [Dentition imperfectly known, but] teeth 
smooth, some indented, and those of the principal mandibular series 
at least twice as broad as long. Dorsal and anal fins equally 
elevated, the latter with 29 rays and four-fifths as long as the 
former, which has 38 rays. Squamation not covering more than 
half of the trunk. 
Form. Log. Purbeckian : Dorsetshire. 
41387, P. 6381. Type specimen, with incomplete counterpart; 
Purbeck Beds, Swanage. 
Purchased , 1869, and BecMes Coll. 
P. 7454. Bemains of head and abdominal region, doubtfully of th 
species; Swanage. The principal teeth of the mandible 
are more transversely elongated than those in the type 
specimen. History unknown. 
P. 6383. Portion of caudal region of small fish, probably young of 
this species; Swanage. Beckles Coll. 
The following specimen agrees with the type of Mesodon daviesi 
in the form and proportions of the trunk, but the head is relatively 
as long as in Mesodon macropterus. The difference is probably due 
to crushing. 
