Fishes of the Wester ti North Atlantic 



509 



overlapping the next outermost; dermal denticles low, with depression in the crown; rear 

 end of base of ist dorsal about over origin of pelvics; 2nd dorsal and pelvics only a little 

 larger than ist dorsal; interspace between ist and 2nd dorsal much shorter than between 

 pelvics and caudal; caudal with axis approximately in continuation of main axis of trunk, 

 very broad relative to its length, with shallow subterminal notch, its lower anterior corner 

 expanded as a well defined lobe; pectoral small, paddle-shaped; skin sprinkled with 

 strongly luminescent, glandular points. Characters otherwise those of the family. 



Range. Tropical and subtropical belts of Atlantic, Pacific and Indian Oceans. 



Fossil Teeth. Upper Cretaceous to Eocene, Africa; Eocene to Miocene, Europe. 



Species. Only one species is known. 



Isistius brasiliensis (Quoy and Gaimard), 1824 



Figures 98, 99 



Study Material. Immature male, 383 mm. long, taken by the Research Vessel 

 "Atlantis," Station 2947, north of the Bahamas at Lat. 25° 11' N., Long. 77° 19' W., 

 where the depth was 1,000 fathoms^ (Harv. Mus. Comp. ZooL, No. 36039); two fe- 



FicuRE 98. Isistius brasiliensis, immature male, about 383 mm. long, from north of the Bahamas (Harv. 

 Mus. Comp. Zool., No. 36039). A Anterior part of head from above to show spiracles, about 1. 1 x. S Head 

 from below, about I.I x. C Dermal denticles, about 4.5 x. D Lateral oblique view of dermal denticle, about 

 45 X. 



I. But not necessarily from so great a depth, as the nets were brought up open to the surface. 



