PKOCELLAEIJD^. 185 



articular extremity, and the presence of an extensor bridge. The 

 femur is shorter and more curved than in the Gavise, this being 

 most marked in Puffinus. 



The coracoid is readily recognized by the extreme expansion of 

 its sternal extremity ; the hyosternal process is small and crotchet- 

 like ; and there is a foramen at the base of the subclavicular 

 process. 



The humerus is relatively longer, more compressed, and more 

 slender than in the Gavia3, and lacks the distinct tricipital fossa of 

 the existing species of the latter ; the extremities are relatively 

 small ; the delto-pectoral crest is short and triangular ; and there 

 may or may not be a subtrochanteric pneumatic foramen. The 

 ulna is very long and slender, and the proximal phalangeal of the 

 second digit of the manus has no fenestration. 



The cervical vertebrse are comparatively short and without 

 neural spines ; in the posterior region of the neck the neural region 

 is extremely short, the zygapophyses are widely expanded, and 

 there is a haemal spine. 



Family PROCELLARIID^. 



This family may be taken to include all the members of the 

 suborder ". 



Genus PUFFINUS, Brisson 2. 



The forms included in this genus are of considerable size, 

 althoiigh much smaller than Ossifrar/a and Diomedea. The tarso- 

 metatarsus is comparatively slender, with two closed tubes in the 

 talon, and the distal trochlcse somewhat approximated. The 

 humerus has a very deep subtrochanteric fossa, devoid of a pneu- 

 matic foramen, a deep depression for the brachials anticus, and a 

 very prominent ectepicondylar process. In Daption the humerus is 

 relatively shorter ; while the species of Oceanites and Frocellaria 

 are of smaller size. 



Puffinus, sp. a. 



Somewhat larger than the existing F. cldororhynchus, but dis- 

 playing the same deep palmar fossa and blunt ectepicondylar pro- 

 cess. It is quite probable that this form may be identical with a 

 living species. 



Hah. South Pacific. 



' Ocanifesie regarded by some authoritief^ ap the type of a Fecnd faruilj". 

 ' Ornilbolopir. vol. n. p. ]3l (17fiO). 



