724 CYSTOPHORA CRISTATA HOODED SEAL. 



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

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

 jphora 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 Gystophora being represented in Macrorhimis by a long 

 flexible proboscis, resulting in a widely different i^hysiognomi- 

 cal expression. 



In respect to general form, Macrorhinus 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 the scapula being 

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

 males being comijared in each case) in Macrorhinus leomnus is 

 twice that of Gystophora 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. 

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

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



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

 only a single species, which is restricted to the colder j^arts of 

 the North Atlantic. A second species has been attributed to 

 the Caribbean Sea, but, as already shown {antea, p. 720), there 

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

 assigned. 



CYSTOPHOEA OEISTATA [Urxl), Miss. 



Hooded Seal, 



Phoca ifcowtwa, Linn:6, Syst. Nat., 1766 (in part, only the reference to Ellis'a 

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

 Mailer's Zool Dan. Prod., 1776, viii ; Faun. Groenl., 1780, 7 (exclud- 

 ing part of the references; not Phoca leonina, Linn6, 1758). WaLt 

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



KlamiitSy 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. 



Ndtsersoak, Cranz, Historie von Gronland, 1765. 



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



Klappmuze, Schreber, Saugt., iii, 312 (based on the foregoing). 



