New Species of Fossil Fish. 429 



extremity is buried in the matrix, but its extent is indicated 

 by the red colour of the fossil in the grey matrix, a 

 character which is exhibited in all these remains. The 

 proximal end of the rib is more or less expanded, apparently 

 for attachment to the vertebral column. 



Though the remains described are fragmentary, quite 

 sufficient evidence is afforded of the generic identity of 

 the fish remains, and there can be no hesitation in placing 

 them in the genus Strepsodus ; with respect to the specific 

 determination, however, the position is not so well defined. 

 The teeth differ from Strepsodus sauroides, Young,* in the 

 greater breadth in proportion to the length ; the surface 

 striation is similar in the two, with the exceptions that in 

 this species the striae are larger, and there is no evidence of 

 bifurcation, and whereas in 5. sauroides^ the base of the 

 crown is ovoid, and laterally compressed, and the apex 

 twice bent nearly at right angles, in this species the base 

 of the crown is circular, and the point is not twisted to 

 the same extent. A second species has been described 

 by Dr. Traquair, from the limestone of Borough Lee, near 

 Edinburgh, under the name of Strepsodus striatulus.'\ 

 It is a smaller species than 6*. sauroides^ is compressed, oval 

 in transverse section, incurved, hardly geniculated at the 

 apex, the base having relatively coarse plications. The 

 shaft of the tooth is ornamented with very delicate, closely 

 placed, sub-parallel raised striae. The absence of a figure 

 of this species renders a comparison somewhat difficult, 

 but the characters of the teeth are readily distinguished. 

 I prefer, therefore, to regard this species as hitherto 

 undescribed, and suggest the no7nen triviale, Strepsodus 

 Brockbanki, derived from the name of its discoverer, who 

 has done so much for the elucidation of the fauna, as well 

 as the general stratigraphical arrangement of these beds, 

 the highest in the carboniferous series hitherto described. 



* Quart. Journ. Geol. Soc.^ Vol. xxii, p. 602, woodcut 3, 1866. 

 -^ Geol. Mag., Sec. 11., Vol. ix., p. 544, 1882, 



