224 FOSSIL FISHES OF THE ENGLISH CHALK. 



L Squatina cranei, A. S. Woo(hvjnd. Plate XLVTI, figs. 7—12. 



1888. Siivaiitia cranei, A. S. Woodwanl, Qiuirl. Journ. Geol. Sue, vol. xliv, p. \4i, pi. vii, figs. 1— G. 



7'y/j)'^ — Imperfect liead, etc., from the zone of Holasfcr salxjloho.'^jis : Brigliton 

 Museum. 



tSppcifie CJinnirtcrs. — Imperfectly known, probably attaining a length of about 

 7-j cm. A few rather lai'ge, oval, dermal tubercles with recurved spines, probably 

 on the paired fins. Upper anterior teeth relatively small, and the opposing teeth 

 of the lower jaw very narrow and slender. 



Description of Specimens. — The type specimen in the Willett Collection exhibits 

 the remains of the head described and figured, Joe. cit. So far as they can be 

 compared, the cartilages resemble those of the existing Squatina. Among the 

 numerous scattered teeth, those from the front of the mouth are distinguishable. 

 Those near the symphysis of the mandible (PI. XLVII, fig. 7) are relatively high 

 and slender, while the opposing teeth (fig. 8) attain liut small dimensions. More 

 posteriorly, both above and below, the teeth begin to exhibit the usual lateral 

 elongation (figs. 9, 1 0) characteristic of the sides of the mouth. The minute granules 

 of shagreen (fig. 11) are mostly oval in shape, having the outer enamelled surface 

 ornamented with loneritudinal or radiatinsr rido^es. The laro^er tubercles, like those 

 occurring on the margins of the paired fins of the existing Squatina, are also of an 

 oval form, with a slightly crenulated margin (fig. 12). From the middle of each 

 there rises a large, backwardly directed spine, which is laterally compressed and 

 well enamelled. 



It is difficult to recognise any distinctive features in the teeth of the different 

 species of Squatina. In S. cranei, however, the anterior lower teeth seem to be 

 more slender than in other known forms, and the anterior upper teeth are remark- 

 ably small. In this species also the spinous dermal tubercles are relatively much 

 larger than in the existing Squatina angelns, and such tubercles have not hitherto 

 been observed in any of the extinct species. 



Horizon and Localiti/. — Zone of Holastrr siilxjlnhosns : Clayton, Sussex. 



Teeth of Sqnatiixi have also been recorded from the Chalk of Lewes and 

 Brighton (A. S. Woodward, Proc. Geol. Assoc, vol. xiii, 1894, p. 191, pi. v, figs. 

 2, 3), and from the zone of Belpmnitella vincronata, near Norwich. 



