330 ME. T. ATTHEY ON ANTHEACOSAUETJS ET7SSELLI. 



two-tenths of an inch behind the fourth, and the like distance in 

 front of the sixth and seventh, which are in contact with each 

 other; two-tenths of an inch separates the seventh from the 

 eighth, which is the same distance in front of the ninth, tenth, 

 eleventh, and twelfth, which are in contact with each other; 

 after an interspace of two-tenths of an inch come the thirteenth 

 and the other six, which are all nearly a quarter of an inch 

 apart from each other. Their surfaces appear to be eroded, 

 which gives to the teeth a ridged appearance. The seventeenth 

 tooth has been extracted; and the microscopic sections repre- 

 sented on Plate IX., figs. 1, 2, 3, 4, were made from it. 



One quadrate-jug al bone, in a good state of preservation, show- 

 ing both its surfaces. The upper surface shows the deep depres- 

 sion or mucus-groove along its outer margin, as figured in Plate 

 VI., fig. 1, also the tubercle with the line from it running inwards 

 and backwards to the fissure which divides into two parts the 

 condvle for articulation with the mandible. 



Only about half a dozen isolated teeth of Anthraeosaurus have 

 been found, which shows how very rare this amphibian is when 

 compared with Loxomma, whose teeth are not unfrequently met 

 with. 



Vertebra : six separate ones, and on one small piece of shale 

 there is embedded a quite entire vertebra; there are also four 

 fragments of vertebral processes, some of which are articular. 



Ribs : four, in a good state of preservation, showing both head 

 and tubercle, and the remains of two others, one of which shows 

 head and tubercle. 



Scutes : in a small piece of shale are imbedded ten, well pre- 

 served, but not lying in natural order ; and on separate pieces of 

 shale six or eight more. 



The scutes of Anthraeosaurus, Plate VI., figs. 2 and 3, are much 

 like those which, since the publication of the description of 

 Loxomma, have occasionally been found in connexion with the 

 remains of the latter ; but they have not as yet been identified 

 as belonging to Loxomma. 



Besides the above osseous remains of Anthraeosaurus, and lying 

 scattered among the vertebrae, there is a good deal of coprolitic 



