436 Br. A. G'unther — Tertiary Fishes of Sumatra. 



to have been rather elongate, with the upper surface of the snout 

 granular. The caudal portion of the vertebral column consists of 

 27 vertebree ; of the abdominal portion 11 can be distinguished — the 

 entire number consisting probably of- about 14. 



The dorsal fin consists of a strong, smooth spine, and seven rays. 

 It is inserted at a short distance behind the head, opposite to the 

 fifth to eighth vertebrse. The length of its spine, is equal to the 

 length of the thirteen last vertebrae. 



The anal fin is low, consisting of twenty- eight short rays. It is 

 supported by interhsemals, which are longer than the fin-rays, and 

 attached to the hsemals, so that two always correspond to one 

 heemal. Caudal' very deeply forked, the length of one of its lobes, 

 being equal to that of the nineteen last vertebrae. 



Pectoral spines about as long and strong as that of the dorsal fin, 

 strongly serrated. Ventral fins inserted immediately behind the 

 dorsal, consisting of seven rays. 



An example in a very fragmentary condition, figured by Dr. 

 W. V. d. Marck under the name of Brachyspondylus indicus, probably 

 ought to be referred to the present species. A glance at the geo- 

 graphical distribution of the species of the genus Pseudeutropius will 

 account for my retaining the specific name given by me, in the place 

 of that of indicus. 



Bagarius gigas. (PI. XVI. Fig. 1.) 

 A large siluroid of the group Bagariina, and probablj'' belonging 

 to the genus Bagarius, is represented by some remnants of the 

 humeral arch, and a nearly perfect pectoral fin; other portions 

 of the skeleton, such as the branchial apparatus, ribs, etc., being 

 too much broken and confused for more detailed description. The 

 pectoral fin is sickle-shaped, apparently consisting of eleven rays, 

 the first of which is extremely strong and long ; rather more than 

 its terminal half is closely articulated, and indistinctly denticulated 

 behind. It is of inches long, and ^ inch broad in its widest part. 

 The humerus is distinguished by the absence of prominent ridges, 

 and of the granulation on the more superficial parts, which evidently 

 were covered by skin. Its symphysial portion is tapering, showing 

 that the union with its fellow must have been short and loose. 



Thynnichtliys amblyostoma. (PL XVII.) 

 The remains of this fish appear to be very common in this stratum. 

 There are four apparently adult examples, three of middle size, and 

 three young ones. The largest has a length of 12 J inches. All lie 

 upon their sides, the head being so much crushed, that only a few of 

 the opercular bones and fragments of one or two of the others can 

 be recognized in situ. Of the vertebral Column nearly the whole 

 (with the exception of the foremost portion) can be made out dis- 

 tinctly, the ribs and scleral spines being rather confused. The fins 

 are sufficiently well preserved to ascertain their structure and 

 position. 



The genus Thynnichthys is characterized by a peculiar shape of the 

 head, the eye being far below the upper profile and the opercules ; 



