NEW FOSSIL SEAL—TJiUE. §37 



single extinct species has been certainly determined, appears, in the 

 light of the evidence, cjitirely valid. 



It is well known that Ft J. Van Bcneden established several o-enera 

 and species for remains of fossil pinnipeds found in the Tertiary of 

 Antwerp, Belgium. These are described very fully and accurately 

 figured in the Annals of the Belgium Museum of Natural History.^' 



llie genera of Phocidfe are JAsy>A//vV/, rah>^<>j>hoc,t^ CaUophoca^PIaty- 

 ji/iocK^ Gryphora, PhocaneUa^ Mrnudherhdi,, and Prophoca. A species 

 of Phoea, called /-*. lutuJInohhs, is also described. Taking these in 

 order, the differences from Lq>i<)p]u>c(i which the humerus presents 

 are as follows: 



In Mcsotaria the size is greater than in L. l,/iiis^ the l)icipital groove 

 is strongly developed, and the entepicondylar foramen is al)sent. In 

 Pida^ophoca the shaft is straight, as in Moiutchnx, and the entepi- 

 condvlar foramen is absent. In Callojjhoca the humerus is massive, 

 Avith the deltoid ridge short and very strong, and no entepicondylar 

 foramen. In I'latyphocd the size is large and the form massive, the 

 lesser tuberosity little developed, deltoid ridge short, shaft straight, 

 with the external face convex. In (jvyphoca the deltoid ridge is very 

 strong and the bicipital groove wide and deep. In /V/^/rY/^/f//« the del- 

 toid ridge is very short and broad. In ^lonat/irrhim the size is large 

 and the form massive; the shaft is straight and the deltoid ridge thick. 



The genus Projyhoca merits more detailed consideration. Under the 

 generic heading. Van Beneden remarks only the following, as regaids 

 the huu'.erus: "The humerus has one of the sides of the bicipital groove 

 quite straight and compressed." '^ He places two species in the genus, 

 P. roiisstaui and P. pi'ox'uiui^ remarking that they are nearly the same 

 size. It would seem from the figures, however, that the former is 

 nmch larger than the latter. Of P. ronssnail. Van Beneden remarks 

 as follows: "The humerus is distinguished from all the others because 

 it is more robust and straighter, the deltoid ridge is little curved and 

 its internal face is scarcely concave, while in all other seals it presents 

 a deep fossa. The bicipital groov(>. is also less deep and is terminated 

 above by the greater tuberosity, which is very strong and nmch ele- 

 vated. The posterior face (of the humerus) is not concave below the 

 neck, as in the other genera."^' Of P. j>ro,,f'j/t(i, he remarks: "The 

 humerus is straight, as in the preceding species and ditfers in that par- 

 ticular from existing species. The head is ([uite large and the neck 

 little pronounced. The greater tuberosity is abraded, but it does not 

 appear to have had the degree of development nor the height found in 

 the ordinary seals. The deltoid ridge is straight, so that the bicii)ital 



«Pt J. Van Beneden, Description des OsHements Fossiles des environs d'Anvers, 

 Ire Partie, Pinnipedes ou Aniphitlieriens, Ann. Mns. Key. d'Hist. Nat. Beljr., I, 

 1877, t-exte et planch^H. 



''Idem, p. 78. 



'Idem, p. 79. 



