^0.1324. ELASMOBRANCHIATE FISHES— JORDAN AND FOWLER. 623 



20. ISUROPSIS GLAUCA (Miiller and Henle). 

 AOZAME (BLUE SHARK); MOROZAME. 



Oxijrhina glauca Muller and Henle, Plagiostomen, 1838, p. 69, pi. xxix; Naga- 

 saki (erroneously stated to be from Java).— Schlecjel, Fauna Japonica, 

 Poiss., 1850, p. ;]03; Nagasaki.— DuMERiL,Elasmobranches, 1870, p. 409 (after 

 Muller and Henle). 



Laiiiiia glauca Gunthek, Cat. Fish., VIII, 1870, p. 391; Cape Seas, St. Helena. 



. Snout long-, pointed; teeth in four rows, very long, tlexuous, with- 

 iOut denticles at base. Spiracles very small. First dorsal inserted 

 well backward, midway between pectoral and ventral, scarcely longer 

 than high, its upper angle rounded. Color dark l)lue, white below. 



Coasts of Japan and southward, rather common about Nagasaki. 

 Many jaws and a stulied foetus are in possession of Mr. Yahiro. 

 A specimen 7 feet long was taken b}" Jordan and Snyder at Matsu- 

 shima, the head having been preserved. 



{(/laucm, hoary blue.) 



19. LAMNA Cuvier. 



Lamna Cuvier, Regne Animal, 1st ed., 1817, p. 126 {cornubicus). 



Lamia Risso, Eur. IMerid., Ill, 1826, p. 123 {cornuI>icus, name preoccupied). 



Selanonius Fleming, British Animals, 1828, p. 169 {walkeri=cornubicus) . 



Body short and stout, the back considerablj^ elevated; snout promi- 

 nent, pointed; teeth triangular, pointed, entire, each one with a small 

 cusp on each side at base; one or both of these sometimes obsolete on 

 some of the teeth in the young; gill-openings wide; dorsal and pectoral 

 fins somewhat falcate; second dorsal and anal fins very small, nearly 

 opposite each other; first dorsal close behind the root of the pectorals. 

 This genus is very close to Isurns^ with which fossil forms seem to 

 connect it. Perhaps the two should be united under the older name, 

 Iswrus. 



{Xa/Ava, a kind of shark, from Xa/uia, a horrible anthropophagous 

 monster, a bugbear used by the Greeks to frighten refractor}^ children.) 



21. LAMNA CORNUBICA (Gmelm). 

 SALMON SHARK; MACKEREL SHARK; PORBEAGLE. 



Squalus cornubicus Gmelin, Syst. Nat., I, 1788, p. 1497; shores of Cornwall 



(after Beaumaris of Pennant) . 

 Lamna cornubica Gunther, Cat. Fish., VIII, 1870, p. 389. — Jordan and Gilbert, 



Synopsis, 1883, p. 30. — Jordan and Evermann, Fishes North and ^Middle 



Am., I, 1896, p. 19 (and of most authors). 



Snout conical, pointed, rather longer than cleft of mouth; teeth 

 if:f| on each side; third tooth on each side in the upper jaw small; 

 first dorsal beginning over axil of pectorals. Color bluish gray. A 

 large and fierce pelagic shark reaching a length of 10 feet. (Jordan 

 and Evermann.) 



