280 PROCEEDINGS OF THE ACADEMY OP 



106 105 



Inch. Line. Inch. L/me. 



Length from end muzzle to convexity of occipital con- 

 dyle 11... 1-2 11... 4 



Length from end muzzle to basal notch 4... 6 4... 7-6 



" " " nares 5... 1-2 5.... 8 



" " " supraoccipital crest 8... 10-4 8... 10-8 



" of ramus mandibuli 8... 7... 9 



Breadth at middle of alveolar border 1 ... 1 1 *4 1... 9-2 



" notch 2... 96 2... 10 



middle of orbits 5... 0-4 4... 7-8 



" temporal crests 5... 0-5 4... 10-5 



" -of blow holes 1... 3 , 1... 2 



" premaxillary knobs 1... 6-8 1... 5-4 



" premaxillaries at middle muzzle 0...10-5 0...11 



palatines anteriorly 1 1 1 1... 9 



" angles of mandible 4... 8-6 4... 9 



Length of upper tooth line 3... 63 3... 9-2 



" gonys 1... 0... 98 



Depth of ramus at middle tooth line 0... 8-4 0... 7-2 



-r .i 25 24 



Teeth _ . 



24 21 



The os hyoides has somewhat the form of a caudal fluke. The anterior 

 extremity is grooved below ; the haemal apophyses are broader than the body, 

 convex exteriorly, thin on the edges, and tapering to a very small articular 

 extremity. Length of body 1 inch 5-8 lines. Extent of apophyses 3 inches 

 8-6 lines. 



Prof. Wyman states,* that in " the porpoise," probably following Cuvier, 

 the seven cervical vertebrae are anchylosed. Hunter states of the Phocsena 

 communis that the four anterior only are united. 



Hyperodon s e m.i j u n c t u s, sp. nov. 



The question as to whether a Hyperodon exists on this side the Atlantic, 

 has at length been solved by the description which I have received through 

 Dr. Alexander Wilcocks of this city, of a species taken in Charleston Har- 

 bor. This is well drawn up by Gabriel Manigault, who set up the specimen, 

 which adorns the Charleston Museum. The points wherein it evidently 

 differs from its congeners, the H. bidens and latifrons, are. first, 

 the separation of the four posterior cervical vertebrae, the three anterior 

 only being solidly anchylosed, instead of the seven, as in the known species, 

 even in the young, according to Dr. J. E. Gray. Second, the possession 

 of one or more pair of ribs added to the flying series, and of two more ver- 

 tebrae, including ten dorsals instead of nine.f Five ribs are connected with 

 the sternum, of which the anterior articulates with the seventh cervical by 

 Its inferior head. 



I extract the following from Gabr. Manigault's description : 

 "The superior maxillary bones are quite pointed in front and widen out 

 towards the base of the snout. Their lateral edges become developed on 

 each side into a prominent vertical ridge, which is slightly convex on the 

 outer surface, and the reverse on the inner. These bones, after having 

 widened out upon approaching the orbits, ascend vertically along with the 

 occipital (the two together holding the frontal, which is quite perceptible, 

 between them.) and form at the back of the heacfra transverse ridge, which 

 is quite high and very thick. From my not knowing by what name it was 



* Journ. Bost. Sac. N. Hist., 1863, p. 6G9. 



f Nine are given by Cuvier, Ossemens Fossiles, viii. 188 ; and Flower, Proc. Zool. Soc, Lond., 

 1864, 419. ^ 



[Dec 



