PLATE III. 
Fig. Page 
]. Esoc(’lops cavifrons^ sp. nov. ; head, left lateral and 
inferior (la) aspects, two thirds nat. size.—London 
Clay ; Sheppey. ag. Articnlo-angular. hr. Pranchi- 
ostegal rays. d. Dentary. ecpt. Ectopterygoid. gu. 
Gular. lim. Hyomandibular, mpt. Metapterygoid. 
op. Operculum, p. Hyomandibular process for oper¬ 
culum. pt.f. Postfrontal (sphenotic). qu. Quadrate. 
s.op. Suboperculum, sy. Symplectic. [P. 1749.] 47 
2. Ditto; head, superior aspect, two thirds nat. size.—Ibid. 
epo. Epiotic. fr. Erontal. s.o. Suborbital. s.occ. 
Supraoccipital.' sq. Squamosal. Other letters as 
above. [P. 640.] 47 
3. d^legcdops prisms.,^]), tlox. ; head, left lateral and superior 
(3 a) aspects, one third nat. size.— Ibid. a.o. Ant- 
orbital. i.op. luteroperculum. mx. Maxilla, p.op. 
Preoperculum. pmx. Premaxilla. scl. Sclerotic. 
X. Process of maxilla. Other letters as above. 
[36070.] 24 
4. Ditto ; hinder half of skull, superior aspect, two thirds 
nat. size.—Ibid. pa. Parietal. Other letters as 
above. IP. 6^7.] 25 
5. Ditto ; longitudinal vertical median section of occipital 
portion of skull, two thirds nat. size.—Ibid, h.occ. 
Basioccipital. h.sp>. Basisphenoid. ex.occ. Exoccipital. 
Other letters as above. 5 a. Posterior aspect of basi¬ 
occipital, showing basicranial canal (6.c.). [P. 356.] 26 
6. Ditto ; right otic region of skull, lateral aspect, two thirds 
nat. size.—Ibid. /. Eacette for hyomandibular articu¬ 
lation. pr.o. Pro-otic. pt.o. Ptcrotic, Other letters 
as above. [P. 4153,] 26 
