544 Dr. R. H. Traquair — Neiv Fish Remains from Borough Lee. 



region of the snout, are seen other teeth similar in form but smaller 

 in size. On the counterpart, the impressions of both palatal plates 

 are seen in situ, each with its marginal row of large teeth, adjoining 

 which a considerable area of the oral surface is roughened with small 

 rounded tubercles, as already seen in another specimen. The two 

 palatal plates are seen to meet, or at least to come very close together, 

 in the median line in front. There is also the impression of a large 

 opercular plate ornamented similarly to the bones of the cranial 

 roof. 



The commencement of the dorso-caudal fin is not exhibited, but 

 posteriorly it becomes, like that of Uronemus and Phaneropleuron, of 

 pretty considerable depth before it declines to the caudal extremity. 

 Its rays are fine, closely set, repeatedly dichotomising and apparently, 

 towards their extremities at least, divided by tolerably distant 

 transverse ai'ticulations. Evidences of an ano-caudal of similar 

 structure but smaller extent are also visible in several specimens, 

 and I have already mentioned the distinct presence, in at least one 

 example, of an acutely lobate ventral. The bones of the internal 

 slieleton are always much confused, but are evidently very similar 

 to those of Uronemus. The scales are very thin, oval in shape, 

 sometimes slightly truncated at one end, and of considerable propor- 

 tional size, sometimes measuring half an inch in length by one-eighth 

 in breadth : externallj'^ they are dull and smooth, but occasionally, 

 especially on the attached surface, they display delicate concentric 

 lines crossed by still finer radiating strife. 



A careful scrutiny of the specimens of Uronemus lohatus, Ag., in the 

 Edinburgh Museum, reveals the fact that the teeth in this strange 

 little fish are very similar in general appearance to those of the 

 Borough Lee Ganoprisfodus, being in the form of low, laterally 

 compressed cones, confluent at their bases and brilliantly ganoid, 

 and taking the obvious similarity of the scales, internal skeleton, 

 and fins also into account, it seems very possible that the two genera 

 may be in reality identical. Unfortunately, besides the shape of the 

 teeth, hardly anything is known of the cranial structure of Uronemus, 

 and consequently I am inclined for the present to retain the name 

 Ganoprisfodus for the Borough Lee fish. I may mention that I have 

 seen no lateral serrations on the teeth of Uronemus, but these are not 

 always present in Ganopristodus. 



I must reserve discussion of the reasons for placing both Uronemus 

 and Ganopristodus in the order Dipnoi for another occasion. 



Ganotdei. 

 Strepsodus striatulus, n.sp. 



Teeth ^ inch to I- inch in length, compressed, oval in transverse 

 section, inciarved, hardly geniculated at the apex, base with re- 

 latively coarse plications. The convex (external) margin of the 

 tooth is quite smooth, the smooth area encroaching more or less on 

 the sides of the tooth in different specimens. The concave (internal) 

 aspect of the tooth, with more or less of the compressed surfaces, is 

 ornamented with very delicate, closely placed subparallel raised striae, 



