68 PROCEEDINGS OP THE ACADEMY OF [April, 



lower caudal lobe, larger and also inserted well before second dorsal, 

 posterior point about If in its length and anterior lobe about equal to 

 length of base. Origins of caudal lobes nearly opposite(?), and distal 

 expansion of upper 7f in its length. Anterior lobe of lower caudal 

 lobe 2yV in length of latter. Upper caudal lobe 2J in rest of body. 

 Pectoral much smaller than first dorsal, interventral space about ^ 

 in length of fin, and greatest width about 2 in latter. In form pectoral 

 rather falcate and pointed and would reach about f of space to ventral. 

 Ventral inserted a little nearer origin of pectoral than that of lower 

 caudal lobe, fin low, its greatest height about last fourth of its length, 

 and clasper well developed. 



Color of dried skin deep dusky-brown over entire upper surface of 

 body, including dorsals and upper lobe of caudal. Upper surfaces of 

 pectoral and ventral of same tint. Entire lower surface of body pale 

 gray-bown, this also largely over remaining portions of fins, anal and 

 claspers. Teeth whitish. 



Length 50^ inches. 



Pondichery, India. June 9, 1840. Thomas Ryan. 



It differs from Cantor's figure^^ in the narrower and longer hammer. 



SQUALID^. 

 Oxynotus centrina (Linnceus). 



Head 5f to 5f ; depth 5f to 7|; width of head 1^ to 2 in its length; 

 depth of head 1|- to If; snout 2f to 3; eye 3f to 4; width of mouth 3f 

 to 4|-; interorbital space 2yV to 3; first dorsal spine 1^ to If; second 

 dorsal spine 1| to 1^^^; least depth of caudal peduncle 4; height of lower 

 caudal lobe 2 to 2|; pectoral 1 ; ventral 1|- to If; length 9|- to 12 inches 

 Italy (Bonaparte, No. 242). From Wilson. 



Also another, dried skin, with same data. No. ^. 



Squalus acanthias Linnseus. 



Castine (G. B. Wood) and Mt. Desert (Dr. H. C. Chapman), Maine; 

 Gloucester (U. S. N. M.), Mass.; Cape May (H. W. Hand), N. J.; Italy 

 (Bonaparte, No. 246). 

 Squalus blainville (Risso). 



Head 5^; depth 8 to Of; width of head If to H "^ its length; depth 

 of head at first gill-opening If to 2^; snout 2^ to 2f , measured from 

 front of mouth ; eye 3f to 4^ ; width of mouth 2^ to 2^^ ; interorbital 

 space 2f to 2f ; first dorsal spine 2f to 2|?; second dorsal spine 2| to 



" Quart. Journ. Calcutta Med. Phys. Soc, No. V, January 1, 1838, PI. 1. 



