444 Dr. A. Gunther on two new Species of Fishes. 



large as those of Crocodilus Harttij and are more tapering 

 and more curved. They also differ widely in the striae and 

 lateral folds. These specimens may provisionally be referred 

 to the genus Thoracosaurus, and, as the species is evidently 

 new, it may be called T. hahiensis. 



An interesting fossil, found by Prof. Hartt at Plantaforma 

 station, is a fragment of a bone, evidently reptilian, but the 

 exact affinities of which it is difficult to determine from this 

 specimen alone. It resembles in some respects the extremity 

 of an ulna, but, after a careful comparison, the writer is inclined 

 to consider it the proximal end of a rib. It is much flattened 

 at the articular extremity, and tapers gradually to the broken 

 end, which is somewhat triangular in outline. Its length is 

 about four inches, the transverse diameter of the perfect end two 

 and a half inches — and of the other, one and a quarter inches. 

 The larger extremity is divided into two articular facets lying 

 oblique to each other, the smaller one being elevated about 

 half an inch above the other, and covering rather more than a 

 third of the entire terminal surface. In form and general 

 proportions this specimen is not unlike the upper end of a 

 right dorsal rib of some of the amphicoelian crocodiles, espe- 

 cially a rib in which the head and tubercle have so closely 

 approached each other that their articular surfaces are nearly 

 confluent. The size and other characters of the specimen, 

 however, seem to exclude it from that order ; and it probably 

 belonged to a Dinosaurian reptile, possibly the same as a large 

 vertebra from Montserrate, which Mr. Allport figured in his 

 paper in pi. xvii., and which Prof. Owen suggested might 

 prove to be allied to Megalosaurus. 



The only other specimen in this collection that need be par- 

 ticularly mentioned here is a small flat bone, about two inches 

 in length, with one articular extremity partially preserved. 

 This appears to resemble most nearly the fibula of a tortoise, 

 and probably should be referred to that group of reptiles. The 

 other vertebrate remains from Brazil obtained by Prof. Hartt 

 are, in general, of less interest, but will be fully described in 

 his forthcoming work. 

 Yale OoUege, April 5th, 1869. 



LV. — Descriptions of two new Species of Fishes discovered hy 

 the Marquis J. Doria. By Dr. A. GiJNTHER. 



The Marquis J. Doria has sent to the British Museum speci- 

 mens of fishes collected by him in Persia and Borneo. 

 Several of the Borncan species have been described in this 



