70 
SELACHII. 
only the septa between the successive myotomes being 
distinguishable, but also the fine fibres of the muscular 
substance itself. Purchased , 1878. 
48105. Fragment of large individual, displaying a portion of the 
vertebral column and ribs, with parts of the fins and 
fossilized muscles. The minute dermal tubercles are also 
well seen upon parts of the specimen, and are represented 
(enlarged about 15 times) in Plate II. fig. 5 ; they have an 
irregular stellate form, with a shallow depression in the 
central portion. Purchased, 1877. 
49546. Portion of large individual, viewed from below, showing 
broken vertebrae with ribs, part of the branchial cartilages, 
a fragment of the pectoral arch, the right pectoral fin, 
dermal tubercles, and fossilized muscle. The branchial 
apparatus is not well preserved, but, so far as can be seen, 
it appears to present striking differences from that of the 
living Squatina, as figured by Gegenbaur 1 ; the basi- 
branchial cartilage more closely resembles that of Raja. 
Purchased, 1878. 
49547. Fragmentary specimen, displaying the basal pterygia of 
the pectoral fins (PI. II. fig. 3). A wide space appears 
between these basal cartilages, but is not improbably due 
in part to shrinkage. At least fifteen cartilaginous rays 
are articulated with the metapterygium, and eight with 
the mesopterygium. Purchased, 1878. 
Squatina cranei 5 A. S. Woodw. 
1888. Squatina cranei, A. S. Woodward, Quart. Journ. Geol. Soc. vol. 
xliv. p. 144, pi. vii. figs. 1-6. 
P1850. Teeth of a Squaloid Fish, F. Dixon, Foss. Suss. p. xii, pi. xxx. 
fig. 35. 
Type. Portions of skull, teeth, and dermal tubercles ; Willett 
Collection, Brighton Museum. 
An imperfectly known species, remarkable for the great size of 
the dermal tubercles with recurved spines, probably situated upon 
the paired fins. The upper anterior teeth are very small, and the 
opposing teeth of the lower jaw comparatively narrow and slender. 
Form. Sf Loc. Lower Chalk : Sussex. 
1 Kopfskelet der Selacbier, 1872, pi. xix. fig. 1. 
