CESlRACIONTIDiE. 
323 
thias. The difference between the anterior and posterior 
teeth is well shown, and most of the examples exposed 
are delicately striated. The pectoral arch is slender, each 
upper extremity tapering to a fine point; and in the ex¬ 
pansions of the pectoral, pelvic, and first dorsal fins there 
are traces of delicate exoskeletal supporting-fibres. The 
fine shagreen-granules are more or less quadrate in form, 
apparently all striated. Egerton Coll. 
% 
P. 3193. A less complete male individual, much crushed and broken, 
but preserved as far as the second dorsal spine. The few 
scattered teeth have mostly smooth crowns. The two 
dorsal fin-spines are comparatively small and much 
abraded distally; and some of the shagreen-granules are 
smooth, though the majority exhibit prominent striations. 
Exoskeletal fibres are also seen in the pectoral and first 
dorsal fins, and indications of large spines occur at the 
extremities of the pelvic claspers. Enniskillen Coll. 
P. 1296. Half of the abdominal region and the nearly complete 
tail, laterally compressed, and mostly exhibiting a definite 
outline, shown of two thirds the natural size in PL VII. 
fig. 1. The body and fins are enveloped in dense shagreen, 
the granules being especially large and thick upon the 
upper border of the tail, and here smooth externally, 
having only dentated margins. The shagreen in most 
parts, however, is fine, and the m ajority of the granules 
appear to be striated. The position of the pelvic fins is 
indicated by the remains of claspers with large dermal 
spines (cL) at the extremities ; but the precise characters of 
the latter are not certainly distinguishable. Each clasper 
appears to be provided with two bifurcating spines in 
contact at their base, which is expanded and flattened 
upon the apposed side; and, as shown in the figure, the 
exserted portion of each of these consists of two com¬ 
pressed divergent branches, gently curved, and unequal in 
size. The second dorsal fin (cL~)is placed opposite a point 
about midway between the pelvics and the caudal; and 
the spine is relatively small, its exserted portion not ex¬ 
tending along more than one third the length of the anterior 
border of the fin. Distinct indications of an anal fin (A.) 
are to be observed opposite the posterior two thirds of the 
second dorsal, but the outline is unfortunately destroyed. 
y 2 
