640 



3929. The left upper canine of probably a female of the Cystophora proboscidea. 



Hunterian. 



3930. The right lower canine of the Cystophora proboscidea. 



Presented by Sir William Blizard, F.R.S. 



3931. The right lower canine, with the enamel smoothly and unusually abraded 

 from the side of the crown, of the Cystophora proboscidea. Hunterian. 



3932. The left lower canine of the Cystophora proboscidea. Hunterian. 



3933. The left lower canine of the Cystophora proboscidea. Hunterian. 



3934. The skull of a young male Seal, from the 'Isles Creusettes ' (Cystophora pro- 

 boscidea?). 



It differs from the Cystophora cristata in the greater length of the enamelled crowns of the 

 canines and the smoother character of the enamel : the crowns of the molars are relatively 

 larger, are separated by a less-marked constriction from the fang, and the enamel does not 

 present the same wrinkled character. The palatal processes of the palatines form a trans- 

 verse quadrate plate more deeply emarginate behind. The cranial and acoustic cavities are 

 larger, indicating the skull to belong to the young of a larger species of Cystophora. The 

 conjoined portions of the malar and zygomatic form a more abrupt and elevated rising from 

 the middle of the zygomatic arch. The premaxillaries do not ascend upon the sides of the 

 nasal aperture, and do not articulate with the nasals. The nasal processes of the maxillaries 

 send out strong antorbital processes. There are traces of a suture partially dividing the 

 orbital from the rostral part of the maxillary, extending from the side of the nasal aperture 

 into the antorbital foramen. The orbital part of the maxillary thus in part detached from 

 the rostral part might be compared with a large lacrymal, but there is no trace of a distinct 

 bone or of any lacrymal perforation in this young cranium. Traces of the sutures between 

 the basioccipitals and the exoccipitals and between these bones and the superoccipital are still 

 retained. This may possibly have belonged to a young individual of the Cystophora pro- 

 boscidea. 



Purchased. 



Subgenus Stemmatopus, F. CUVIER. 



3935. The cranium of a male Hooded Seal (Cystophora cristata). 



The external incisors are like small canines : the molars have very short, low, subelliptic, 

 conical crowns, with the enamel longitudinally wrinkled and divided by a well-marked con- 

 striction from the expanded fangs, which are sub-bifid and short. The superoccipital inclines 

 from below upwards and forwards. The temporal cristae have not met above the parietal 



