294 PROCEEDINGS OF THE ACADEMY OP 



B. artfjustata. B. cat^don Fabr. 



Tripodal Prenarinl maxillary area; Triangular 



Ten Dorsal vertebrte and ribs ; Eleven 



No vertebral canal Cervical vertebra ; One or two with vertebral 



canals, spine of axis ele- 

 Spine of axis flat ; vated. tectiforin. 



Corai-oid deflected from Scapula Coracoid long, slender, in 



plane, short ; plane of plate. 



Shorter, superior outline Elongate, superior mar- 



regularly arched. gin with a long concav- 



ity. 

 In the specimen of the B. c a t o d o n, the o. o. palatina are slightly in con- 

 tact ; in the B. angustata the contact is extensive and quite as in B. c o n- 

 c r e t a. 



The B. canadensis resembles the B catodon, except in the form of 

 the scapula, and of the prenareal maxillary area, in which respect it does not 

 differ from the B. angustat a. Examination of a specimen received by the 

 Academy from Prof. BrunT't, of the Lavalle University, Quebec, shows the 

 postero-inferior process of the atlas to be present, Dr. Wyman's figure, pre- 

 viously cited by me, being erroneous in this respect.* 



Puoc^na brachycium, Cope, Proc. A. N. Sci., Phila., 1865, 279. 



The specimen supposed by me to be the Ph. communis, with which the 

 present species was compared, belongs to the Ph. vome ri n a* Gill, of the Cali- 

 fornian waters. Having since received from the Smithsonian Institution two 

 crania of the Ph com m u n i s, from the Nortli Atlantic, comparison shows a 

 greater resemblance to the Ph. brachycium. The differences are, the 

 maxillaries in communis are decurved, as in v o m e r i n a, and more than 

 in brachycium; in communis the vomer appears more posteriorly on 

 the palate, being less than Us own length in advance of tlie line of the 

 posterior teeth ; in brachycium this distance is nearly double the length 

 of the visible portion. The projecting portion of the pterygoids is equal to the 

 portion in advance of the posterior margin of the maxillaries, while in the 

 P. brachycium it is much less. The muzzle in advance of the posterior 

 extremity of the vomer is barely contaiued 2j times in the length to the ex- 

 tremity of the pterygoids, while it is one third that distance in the commu- 

 nis. In other respects the crania, including the teeth, are nearly similar; 

 and it must be admitted that the full establishment of our species must de- 

 pend on further investigations. 



Sagmatias AMBLonox, sp. et. gen. nov. 



Char. Gener. Supraorbital expansions of the o. o. maxillares obliquely de- 

 scending and diminishing to a thin edge. No triangular preuarial depression ; 

 gonys short; teeth very short, obtuse, numerous. 



It will be a matter of importance in the completion of the characters of 

 this genus, to ascertain the presence of a dorsal fin. Supposing it to possess 

 one, it remains intermediate between Delphinus sect. Lagenorhynchus, Gray, 

 and Phocania, differing only from the latter in the cylindric form of the 

 teeth. Like the Phocsenre, the only species has the posterior extremities of 

 the intermaxillaries much elevated and smaller. Supposing it to lack the 

 dorsal fin, it will differ from Neomeris in the form of the teeth, from beluga 

 in the number of the teeth, and from Delphinapterus in the horizontal or- 

 bital plates and prenareal triangle of the latter. 



Char, sp cif. Triangle* replaced by a rugose area, which measures two- 

 fifths the length of the muzzle from the notch. Muzzle entirely flat, premax- 

 illaries in contact from nares to within two inches of end. On anterior half 

 maxillaries not decurved to alveolar margin, but oblique ; exposed portion at 



* Proc. Acad, Phila., 18C5, 178. 



[Oct. 



