274 sELAcnii. 
P. 2083. Plaster cast of type specimen ; Isle of Wight. 
E^erton Coll. 
P. 2082. Skull, mandibular, hyoid, and branchial arches, with re- 
mains of the dentition, referred to by the present writer, 
he. cit. : Pevensey Bay, Sussex. A side view of the spe- 
cimen is given, of one half the natural size, in PI. XII. 
tig. 1, indicating the general proportions of the ptery go- 
quadrate and mandibular («id.) cartilages. The 
upper jaw projects forwards beyond the lower, and there 
is no evidence of an articulation of the pterygo- quadrate 
with the cranium, cither in advance of or behind the 
orbit. The hyomandibular cartilage is only imperfectly 
shown, but seems to have been slender ; and there is dis- 
tinct evidence of five pairs of branchial arches. Portions 
of the latter of the left side are shown, one half nat. size, 
in PI. XII. fig. 3, A/-.1-5 ; they rapidly diminish in size 
backwards, the fifth being very small and slender. The 
granular calcifications in all the cartilages appear to be 
entirely superficial. Eyerton Coll. 
P. 2082 a. A more imperfect head, with a portion of the dentition ; 
Pevensey Bay. The anterior extremities of the ccratohyal 
cartilages (c7u/.), with a large rounded basihyal (l>7i 
well shown (PI. XII. fig. 2). Kyertou Coll. 
P. 3172. Head, scarcely crushed, with a nearly complete mandible, 
remains of the dentition, and indications of the large 
ceratohyal cartilages; Pevensey Bay. Enniskillen Coll. 
P. 3172 a. Portion of crushed head, with many imperfect teeth in 
at least three erect scries, and also remains of the eerato- 
hyals and branchial arches ; Pevensey Bay. 
Enniskillen Coll. 
P. 3172 h. A very imperfect large head ; Pevensey Bay. 
Enniskillen Coll. 
P. 3172 C. Smaller head, uncrushed, displaying part of the dentition, 
and showing the form and proportions of the occipita 
region of the cranium ; Pevensey Bay. Enniskillen Coll. 
P. 3172 d. Portions of a small head, with the much broken anterior 
dorsal fin-spine ; Pevensey Bay. The massive character 
of the large ceratohyal cartilages is shown. 
Enniskillen Coll- 
