724 CYSTOPHORA CR1STATA HOODED SEAL. 



outer digits far exceeding in length the middle ones. The nails 

 are also rudimentary in the last-named genus, while in Cysto- 

 phora they form strong, well-developed claws. A further differ- 

 ence in external characters consists in the form of the nasal 

 appendage of the adult males, the large inflatable sac met 

 with in CystopJiora being represented in Macrorhinus by a long 

 flexible proboscis, resulting in a widely different physiognomi- 

 cal expression. 



In respect to general form, MacrorMnus is heavily developed 

 anteriorly, all the bones of the fore limbs being especially mas- 

 sive, while those of the hind limbs are rather weak, and the 

 feet small. The scapula is very large and broad, the width at 

 the widest part being equal to the length. The acromion pro- 

 cess is strongly developed, and the crest placed very near the 

 posterior border, two-thirds of the width of hhe scapula being 

 in front of the crest. While the length of the skeleton (adult 

 males being compared in each case) in Macrorhinus leomnus is 

 twice that of Cystophora cristata, and the bulk of the whole 

 animal must be many times greater, the hind limb is only a 

 little larger than in the latter (for detailed measurements see 

 infra, pp. 733 and 750). While the humerus and radius are each 

 twice as long in Macrorhinus as the corresponding parts in 

 Cystophora, the tibia is scarcely a third longer, while the rela- 

 tive length of the pelvis in the two is as 5 to 4 ! 



Cystophora, so far as is certainly known, is represented by 

 only a single species, which is restricted to the colder parts of 

 the North Atlantic. A second species has been attributed to 

 the Caribbean Sea, but, as already shown (anted,, p. 720), there 

 seems to be reason for believing the locality to have been wrongly 

 assigned. 



CYSTOPHOEA CEISTATA (Erxl.), Nilss. 

 Hooded Seal. 



Phoca leonina, LLNNE, Syst. Nat., 1766 (in part, only the reference to Ellis's 

 "Seal with a Cawl"; not Phoca leonina, Linn6, 1758). FABRICIUS, 

 Miiller'sZool Dan. Prod., 1776, viii ; Faun. Grceul., 1780, 7 (exclud- 

 ing part of the references; not Phoca leonina, Linne", 1758). WAL- 

 LACE, Proc. Roy. Phys. Soc. Edinb., 1862, 393. 



KlamiiU, EGEDE, Det gamle Gronlands Nye Perls., etc., 1741, pi. facing p. 46. 



Seal with a Cawl, ELLIS, Voyage to Hudson's Bay, etc., 1748, pi. facing p. 134. 



Neitsersoak, CRANZ, Historic von Gronland, 1765. 



Hooded Seal, PENNANT, Synop. Quad., 1771, 342 (based on Egede and Cranz). 



Klappmiize, SCHREBER, Saugt., iii, 312 (based on the foregoing). 



