274 
SELACHII. 
P. 2083. Plaster cast of type specimen ; Isle of "Wight. 
Egerton Coll. 
P. 2082. Skull, mandibular, hyoid, and branchial arches, with re¬ 
mains of the dentition, referred to by the present writer, 
loc. cit.; Pevensey Pay, Sussex. A side view of the spe¬ 
cimen is given, of one half the natural size, in PI. XII. 
fig. 1, indicating the general proportions of the pterygo- 
quadrate (ptq.) and mandibular (mcl.) cartilages. The 
upper jaw projects forwards beyond the lower, aud there 
is no evidence of an articulation of the pterygo-quadrate 
with the cranium, either 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, hr . 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. Egerton Coll. 
P. 2082 a. A more imperfect head, with a portion of the dentition; 
Pevensey Bay. The anterior extremities of the ceratohyal 
cartilages (chi/.), with a large rounded basihyal (bin/.'), are 
well shown (PI. XII. fig. 2). Egerton 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 series, and also remains of the cerato- 
hyals and branchial arches ; Pevensey Bay. 
Enniskillen Coll. 
P. 3172 b. A very imperfect large head ; Pevensey Bay. 
Enniskillen Coil. 
P. 3172 c. Smaller head, uncrushed, displaying part of the dentition, 
and showing the form and proportions of the occipital 
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. 
