222 DESCRIPTION OF VERTEBRATE REMAINS, CHIEFLY 



sents a number of small grooves extending forward from neuro-vascular canals 

 within the maxillaries. 



The nasal passages present the usual want of exact symmetry, and are in no 

 wise peculiar. The right one measures an inch and three-fourths transversely, and 

 the left one has a little greater fore and aft diameter. The nasal partition ob- 

 liquely measures four and a half inches in depth. 



The length of the beak in its entire condition, from the upper nares, has been 

 about twenty-two inches. The perpendicular depth, from the posterior expanded 

 extremity of the intermaxillary ridge to the lowest part of the median palatine 

 carina, is four and three-quarter inches. The width of the beak, on a line with the 

 anterior wall of the nasal passages and just outside the prenarial fossee, is six and 



a half inches. 



A section of the anterior extremity of the beak, across the exposed supra- 

 vomerine canal, is transversely oval, with the left pole flattened and the upper part 

 deeply notched, with the edges of the notch projecting upward. On each side of 

 the notch there is a foramen directed from a canal extending parallel with the 

 vomer, but situated between the maxillaries and the intermaxillaries. 



Choneziphius liops. 

 C'honezijMus leiops, Leidy : Proceedings Academy Natural Sciences, Philadelphia, 1876, 81. 



A second and smaller species of Ziphioid Cetaceans, which may be regarded as 

 of the same genus as the former, is indicated by another specimen from the same 

 collection of fossils. It also consists of a muzzle detached from the cranium, and 

 is represented in fig. 1, PI. xxx. and fig. 2, PI. xxxi. Like its associate, ascribed 

 to C. trachops, it is exceedingly dense and has all the constituent bones completely 

 co-ossified. Both specimens are brown in hue from ferruginous infiltration, but 

 the one under special consideration is darker, and on freshly fractured surfaces 

 appears black. Its upper part exhibits many holes produced by boring mollusks. 

 The end of the beak is lost, but the specimen retains its supra-orbital processes. 



From the ant-orbital notches the muzzle tapers, at first in a curving and then 

 in a straight line, towards the end more abruptly than in the former species, so 

 that the beak did not appear proportionately so long and narrow as in that one. 



The CO- ossified intermaxillaries cover the supra- vomerine canal except at the 

 fore part of the beak, where it is exposed as a demi-cylindroid groove bounded by 

 acute borders. How much the exposure of the canal is due to loss of a portion 

 of the intermaxillaries, cannot be determined ; but if the sharp edges of the groove 

 are the natural condition, the loss has been small. 



