190 PROCEEDINGS OF THE ACADEMY OF [1879. 



foramen magnum is deeply excavated. The external surface of 

 the brain case and of the zygomata is minutety rugose. 



There are no lobes of the posterior border of the anterior supe- 

 rior premolars, while they are present on the two inferior premolars. 

 The superior sectoi'ial is normal, while the first superior tubercu- 

 lar is like that of Synagodus mansuetus, without distinct median 

 crest or tubercle. The heel of the inferior sectorial is also like 

 that of the species just mentioned; one border is much more ele- 

 vated than the other, and forms a cutting edge. The inferior 

 tubercular is small, is longitudinally oval, and supports two low 

 tubercles. This is one of the most important points of difference 

 between this species and the S. mansuetus. In none of the speci- 

 mens is there any trace of the second tubercular. 



The skeleton is that of a dog of the size of a rather small black- 

 and-tan terrier. 



Dr. Ruschenberger states that the incisor teeth of the dogs 

 were shed at an age of about six months. He also informs me 

 that they did not breed after coming to this country. Dr. Gray 

 states that these dogs are fed largely on vegetable food in Japan, 

 and have an artificial existence in various respects. They are, 

 according to Dr. Ruschenberger, uncommon and expensive in 

 Japan. 



I have been unable to discover that any name whether varietal 

 or specific has been given to this dog. 



Icticyon, Lund. 



One existing and one extinct species have been found in Brazil; 

 the latter in the caves. I describe a species from Oregon which I 

 cannot separate from them generically. 



Icticyon crassivultus, sp. nov. 



This dog is so far represented by a skull, which, while it lacks 

 the parietal and occipital regions, is otherwise nearly complete, 

 having both mandibular rami. The dental formula is, I. ; C. \; 

 Pm. | ; M. ^. The single superior tubercular molar is similar in 

 general to that of other Ganidce. The inferior sectorial has an 

 internal cusp, and posterior heel, the latter with a low cutting 

 edge on one side. Inferior tubercular well developed. 



The dental formula of this animal is that of Icticyon, Lund, of 

 which a species has been found in the cave deposit of Brazil, and 

 another still lives in that region. 



