274 Albany Museum Records. 



about 20 mm. in diameter. The snout on the plane of the 1st 

 molar is probably only about 15 mm. wide. 



ThelegnatliHs Browni, g.n. et. sp. n. 



In the collection are a number of frasrments of jaws with 

 teeth closely resembling those of Procolophon. Unfortunately 

 there are no satisfactory skulls or bones of the skeleton. From 

 the structure of the teeth, however, there seems little doubt that 

 the remains belong to a member of the Procoloplionia. 



The numerous fragmentary remains belong to at least two 

 species, and possibly to three. The majority of the fragments and 

 the best preserved belong to an animal a little larger than Pm- 

 coloplion trigoniceps, and indicate a new genus and species which 

 I propose to name as above. It is represented by a fairly good 

 left maxilla with teeth, the front of the right dentar}', and a few 

 other fragments 



In the maxilla there are 6 and possibly 7 molar teeth, and as 

 in Procolophon they are anchylosed to the bone. In structure 

 and shape the teeth also resemble closely those of Procolophon. 

 They differ, however, in becoming steadily larger on passing back. 

 The antero-posterior measurement of the first 6 molars is 17.5 mm 

 and all the teeth are about 1 mm. high. The maxilla is fairly flat, 

 and measm-es 27 mm. by 12 mm. It has two fairly large foramina, 

 the first above the interspace between the 2nd and 3rd molars, and 

 the second al)ove the interspace between the 5th and Gth. 



A second specimen shows three maxillary teeth in beautiful 

 preservation. They are probably the 1th, 5th, and Gth. The 1th 

 is 2*5 mm. by 4 mm. and 4.3 mm. high. The crown is distinctly 

 constricted antero-posteriorly in the middle, and though a little 

 worn, it is fairly sharp. The 5th tooth is 2*8 mm. hj 5 mm., and 

 the Gth tooth is 3-5 mm by G mm. The 5tli and Gth teeth are less 

 constricted than the 4th. 



The dentary is relatively slenderer than in Procolophon. 

 There are in the preserved portion 5 teeth remaining, and the 

 sockets of 3 more in front. The 5 measure 17 mm. 



From the shape of the maxillary bone, and fi'om the narrow- 

 ness of the dentary, it seems probable that Thelegnathns had a 

 longer and narrower skull than Procolophon. 



