SQUALOKAIID J3. 
41 
plates already described in the upper jaw. A recent examination 
of this unique fossil in Edinburgh has convinced the writer of the 
correctness of Dr. Traquair’s determination of the affinities of the 
fish. 
tfo/jch t CJ os & 
Squaloraja Agassiz. 
[Plate III. fig. 2.] 
1833. Squaloraia dolichognathos, H. Riley, Proc. Geol. Soc. vol. i. p. 484 
(specific name inappropriate). 
^ 1837. Squaloraia dolichognathus, H. Riley, Trans.Geol. Soc. [2] vol. v. 
p. 83, pi. iv. 
1836. Spinacorhinus polyspondylus, L. Agassiz, Poiss. Foss. vol. iii. 
pis. xlii^^np, and Feuili. p. 94. 
' 1813. Squaloraja polyspondyla, L. Agassiz, ibid. vol. iii. p. 381. 
1872. Squaloraja poly spondyla, W. Davies, Geol. Mag. vol. ix. p. 145, 
pi. iv. 
1885. Squaloraja polyspondyla, C. Hasse, Palasontogr. vol. xxxi. p. 4, 
pi. i. figs. 2, 3. 
1886. Squaloraja polyspondyla, A. S. Woodward, Proc. Zool. Soc. p. 527, 
pi. Iv. figs. 1-5, 7, 8, and ibid. 1887, p. 481. 
Ti/pe. Imperfect skeleton ; Bristol Museum. 
The type species, usually not exceeding 0*45 in length. Head 
occupying more than one third of the total length ; distance between 
pectoral and pelvic arches two thirds as long as the head ; caudal 
region attenuated. Rostral spine of male slender, depressed oval in 
section, terminating bluntly and not excessively attenuated, occu¬ 
pying more than three quarters the length of the rostral cartilage ; 
claspers of male robust, with a small distal cluster of slender 
recurved hooklets. Dermal tubercles sparse, a regular series of 
prominent hooklets on each lateral margin of the tail. Mandibular 
and palatine teeth about six and a half times as long as their maxi¬ 
mum breadth, the symphysial portion somewhat raised and tumid. 
Form. Sf Log. Lower Lias: Dorsetshire. 
The following specimens were all obtained from the Lower Lias 
of Lyme Regis. 
v 43307. Head, vertebral column, and fragments of pelvic fins, de¬ 
scribed and figured by W. Davies, loc. cit. 
Purchased, 1872. 
^P. 2276. The nearly complete skeleton of a male, wanting only a 
small portion of the caudal region ; described and figured 
by the present writer, loc. tit. Purchased , 1882. 
