EUGNATHIDiE. 
297 
The following specimens were all obtained from the neighbour¬ 
hood of Lyme Regis :— 
P. 2030. Nearly complete fish, with crushed head, shown of two- 
thirds the natural size in PL VI. fig. 1. The head is 
obliquely distorted, but its proportions are indicated and 
part of the dentition is well shown. The maxilla ( mx .) 
bears small and slender teeth increasing in stoutness 
forwards, and the horizontally extended premaxilla 
shows a close series of eight or nine robust teeth; the 
dentary bone also exhibits its sparse series of compara¬ 
tively large and stout teeth. The cheek-plates and 
opercular bones are crushed beyond recognition, and the 
squamation behind is much displaced. Portions of all 
the fins are shown, but only the caudal fin is well pre¬ 
served. Egerton Coll. 
P. 2031-33. Two specimens somewhat smaller, and a third fish, still 
smaller, wanting the caudal fin. The first specimen is 
nearly complete, distorted a little in the caudal region, 
and with good squamation; the second wants the greater 
part of the skull and jaws ; the third displays the 
opercular bones and the dentition of maxilla and dentary. 
Egerton Coll. 
P. 3630, P. 3636-38, P. 4234. Live specimens more or less 
imperfect, varying in length from 0*33 to 0*23, and all 
exhibiting part of the dentition. Enniskillen Coll. 
P. 3634 e. A distorted and disturbed specimen, showing some 
scattered bones of the head. The hyomandibular is 
shown to be a laterally-compressed, expanded bone ; and 
the left mandibular ramus (PI. IV. fig. 3), with its elevated 
coronoid region, is well exposed. Some of the scales 
exhibit a robust peg-and-socket articulation. 
Enniskillen Coll. 
38526. A small distorted fish, the trunk chiefly shown in impression. 
Part of the roof of the skull, the left maxillary and 
dentary bones are exhibited; and there is a displaced 
portion of vertebral column, probably of the same fish, 
which seems to comprise ossifications in the notochordal 
sheath. Purchased , 1864. 
48006. Imperfect fish, ventral aspect, displaying branchial arches, 
the very small anterior ventral scales, and a coprolite at 
the origin of the anal fin. Purchased, 1877. 
