cystophora. 193 



(1) Cystophora crlstata. (Cy. cr.) 



(Crested, Hooded, or Bladder-nosed Seal, North Atlantic, Arctic Ocean.) 



Phoca cristata, Erxleben, Syst. Reg. Anim., 1777. 

 Cystophora cristata, Gray, Zool. Voy. Erebus and Terror, 

 1844. 



Colour bluish black above, lighter on sides and belly 

 with irregular spots, head and limbs black. Adult 

 males with inflated narial sac. First and fifth toes 

 of pes longer than intermediate toes, nails rudi- 

 mentary or absent. Anterior nares capacious, 

 widest in upper third. Hard palate truncated at 

 posterior border, reaching close to hamulars. Man- 

 dible with longitudinal incurved subcondyloid ridge 

 not reaching angle ; coronoid elongated. Length of 

 male 7 to 8 feet, of female about 7 feet. Vertebral 

 formula C7Dj5L5S4Cdj(j = 41. 



1. Skull, adult. Length 11 inches, over vertex 15^ inches; 



breadth, zygomatic 8^ inches, cranial 5^ inches. 

 Mandible 7h inches; pair of sagittal ridges separated 

 by triangular interspace. Teeth a little worn. 

 Anterior nares, sagittal diameter 3| inches, transverse 

 2| inches. 

 North Atlantic. Donor — Dr James Foulis. 



2. Skull, adult. Length lOf inches, over vertex 14f inches; 



breadth, zygomatic 8| inches, cranial 5^ inches. No 

 mandible. Anterior nares, sagittal 3| inches, trans- 

 verse diameter 2h inches. Teeth absent ; pair of 

 sagittal ridges. 

 North Atlantic. Turner Collection. 



3. Skull, adult. Length 10 inches, over vertex 14^ inches; 



breadth, zygomatic 8^ inches, cranial 5^ inches. 

 Mandible 7|- inches. Teeth only a little worn ; pair 

 of sagittal ridges Turner Collection. 



4. Skull, adult. Right tympanic wanting. Length lOf 



inches, over vertex 14| inches. Breadth, zygomatic 

 7 1 inches, cranial 5 inches. Mandible 7-| inches. 

 Teeth worn ; pair of sagittal ridges. 

 North Atlantic. Turner Collection. 



5. Skull, young adult, male. Length 9^ inches, over vertex 



llf inches. Breadth, zygomatic 6-| inches, cranial 

 4 1 inches. Mandible 6 inches. Teeth a little worn. 

 Greenland Sea, north of Jan Mayen Island. 



Donor— Dr Rt. Brown, 1861. 

 13 



