THE RED AND NORWICH CRAGS. 451 



cavities, whicli seem to be situated in the maxillary bones, 

 issue several canals. The most clearl)- defined of these is the 

 one alluded to above, as the premaxiilary canal ; a second (as 

 seen in fig. 8 b), passing almost directly forward on the outermost 

 edge of what seems to be the maxilla, may be termed the 

 maxillary canal, and is best seen on the left side ; from the 

 lower part of the cavity a third channel may be seen passing 

 forwards ; and, then curving upwards, it extends as a shallow 

 groove to the end of the rostrum ; this may be termed the sub- 

 maxillary canal ; and from about the middle of this latter canal a 

 subsidiary groove may be seen branching off below it. These three 

 canals, seen on the sides of the specimen, evidently correspond with 

 those described by Prof. Huxley in Belemnozlphius com-pressus, and 

 ^eem to^ be present, more or less covered in by bone, in all the 

 rostra referable to Mesoplodon. 



From the cavity on the right side of the specimen another large 

 canal passes upwards and backwards ; but on the left side a much 

 smaller canal seems to occupy a similar position in the maxilla. 



Each of the large cavities in all probability lodged a ganglion of 

 the fifth nerve, the branches of which passed out through the 

 various apertures and canals. 



When first examining this specimen I thought it might be a much 

 denuded portion of the more elongated rostrum of another species ; 

 but a closer attention has convinced me that, although much abraded 

 (as indeed are almost all the fossils from the same deposit), it is as 

 much to be relied upon for its main features as are most of the forms 

 hitherto described. 



The complete ossification of the mesethmoid being one of the 

 chief characters of Me.soj>lodon, this specimen must be placed in 

 that genus ; and the short rosti'um, with its sharp boat-like anterior 

 extremity, is so entirely different from any form yet described that 

 it becomes necessary to give it a specific designation by which it may 

 in future be known, and it is proposed to name it Mesoj^lodon 

 .scaphoides. 



8. AiLURUs ANGLicus, Dawkius. (PI. XVIII. figs. 9 a, 9 b.) 



Prof. Boyd Dawkius described before this Society in 1888* a 

 portion of a lower jaw witli the carnassial tooth in place, from the Red 

 Crag of Suffolk, which he referred to the genus Ailuriis, and named 

 A. anglicus. In the discussion which foUo^ved the reading of the 

 paper. Dr. Blanford called attention to the restricted distribution of 

 this genus, and to its affinities with the American Ilacoons; he 

 thought Prof. Dawkins's reference was possibly correct, but that one 

 tooth was scarcely sufficient to go upon, and on the whole the 

 determination would require confirmation. I am happy to say we 

 have now some additional evidence. 



Mr. Percy H. Browne, of Pcugate, has recently presented to the 

 Museum of Practical Geology a perfect upper molar tooth, from tlie 



* Quart. Jouni. vol. \liv. p. 228. 



