312 GENUS CALLORHINUS. 



the Lion at two, and as soon as the pup is born They 



suckle their young five months before they are taken to the 

 sea, by which time the pup has shed its first hair. Before the 

 mother takes her pup to fish she has to ballast it, and I have 

 seen a Lioness trying for hours to make her pup swallow small 

 stones at the water's edge. 



" The female keeps her pup with her until two or three weeks 

 before the next breeding-season, when she drives it from her. 

 About this time the yearlings will be found some few miles 

 from the old rookery. . . . 



" The Lions stay as long -as two months on shore, during the 

 breeding-season, without going into the water. During that 

 time their fat gives them sufficient nourishment. After the 

 season is over some of them are so thin and weak that they 

 are but just able to crawl into the water. I have killed them in 

 this state, and not one particle of stone have I found in them."* 



GENUS CALLORHINUS, Gray. 



Callorhinus, GKAY, Proc. Zool. Soc. Lond.,1859, 359. Type "Arctocephalus 



ursinm, Gray," = Phoca ursina, Linne". 

 Arctocephalus, GILL, Proc. Essex Institute, v, 1866, 7, 11. Type " Phoca 



ursina, Linnsens." Not Arctocephalus, F. Cuvier, 1824. 



Molars g=|, small. Facial portion of skull short, broad, con- 

 vex, and but slightly depressed ; nasals short, rapidly narrow- 

 ing posteriorly. Palatal surface short, narrowed behind, with 

 the hinder border rather deeply concave. Toe-flaps very long, 

 nearly as long as the rest of the foot. 



Callorhinus, in coloration, character of the pelage, size, gen- 

 eral form, and dental formula, is rather closely allied to Arcto- 

 cephalus, from which, however, it is readily distinguished by the 

 form of the facial portion of the skull, which in Arctocephalus is 

 narrower, longer, and much less convex, with much longer na- 

 sals. From the other genera of the Otaries it is distinguish- 

 able not only by coloration and the character of the pelage, but 

 by its weaker dentition, and the strongly marked cranial differ- 

 ences, which are too numerous and obvious to require detailed 

 enumeration. It is the only North American genus which has 

 the upper molars 6. 



Very young skulls and skulls of females of the different spe- 

 cies of Otaries differ from each other very little in general form, 

 and in some cases are not readily distinguishable, especially in 



* Letter from Captain Henry Pain, of the S. S. " Scanderia'' to Mr. F. Cole- 

 rnau of the Falkland Islands Company, Proc. Zool. Soc. Lond., 1872, pp. 

 681, 682. 



