MAEYLAND GEOLOGICAL SURVEY 31 



lary bone is best preserved, there are eight alveoli; the teeth are lost. 

 The lateral border of the maxillary bone overhangs the tooth line 

 eonsidexably in front, and spreads away from it outwards and back- 

 wards in a gradually thinner edge to the deep notch which bounds the 

 supraorbital region anteriorly. The rise of the anterior border of the 

 facial basin is within this notch, and not without it, as in the species 

 of Cogia; and is gradual, attaining a considerable elevation immediately 

 in front of the temporal fossa, and a little within the vertical plane 

 of the supraorbital border. The premaxillary bones are separated by 

 the deep vomerine channel which they partially overroof on each side, 

 and are separated posteriorly by the prenarial part of the vomer pos- 

 teriorly. The latter forms an elevated crest directed forwards and 

 unsymmetrically to the right. The premaxillaries spread gradually 

 outwards posteriorly to a thin margin, and are concave opposite to 

 the vomerine crest which separates them, that of the left hand 

 descending to the narial orifice. The skull is broken off at the blow- 

 holes, so that it is difficult to affirm positively whether the right blow- 

 hole existed or not. It was apparently present, but smaller and pos- 

 terior in position to the right one. The inferior surface of the 

 iiiaxillaries slopes upwards and outwards, leaving the inferior face of 

 the vomer quite prominent below. The vomer forms the half of a 

 circle in transverse section above, and extends as far anteriorly as the 

 specimen extends. 



" There is a large supraorbital foramen between the preorbital notch 

 and the rising edge of the facial crest, as in the sperm whale; and there 

 is a smaller one in a direct line posterior to it Just exterior to a more 

 elevated part of the crest, within a line above the posterior part of the 

 supraorbital border. A longitudinal groove anterior to the supraorbital 

 foramen is pierced in its fundus by two foramina. Anterior to the 

 groove a depressed foramen pierces the maxillary bone near the pre- 

 maxillary border. Anterior and interior to the corresponding foramen 

 of the left side a depressed foramen pierces the premaxillary bone. 

 This foramen is absent from the right side. On the other hand, the 

 right premaxillary is pierced near the anterior part of the vomerine 

 crest by a large round foramen, which is wanting from the left side. 



