420 



PROCEEDINGS OF THE ACADEMY OP 



[Oct. 



Body elongate, well compressed, and tapering from head into a long 

 slender tail, though not filamentous. Greatest depth falls about origin 

 of pectoral. 



Head large, compressed, its width about 2^, and its depth nearly 

 equal to its length. Upper profile of head rather evenly convex, and 

 well inclined to base of dorsal spine, depression above eye probably 

 due to shrinkage. Lower profile of head forming a broad triangle at 

 lower symphysis of mandible. Snout long, broad, its greatest width 

 about I3- in its length. Eye small, rounded, high, or near upper profile 

 of head, and a trifle behind middle of its length. Mouth broad, trans- 

 verse, inferior. Lips thick and fleshy. Teeth evidently damaged. 

 At present upper jaw with 2 small approximated flat triangular laminae, 

 •and posteriorly along each side of upper jaw a broad and also long 

 lamina extending far back. On each of these upper plates are 2 series 



Fig. 1. — Hydrolagus waitci Fowler. (Type.) 



of slightly elongated obsolete asperous patches and well separated. 

 Mandible consisting of 2 trenchant strong plates, division or approxi- 

 mation at symphysis, and their edges entire. Maxillary covered above 

 more or less by skin of preorbital region, and its distal extremity falls 

 about half an eye-diameter anterior to front margin of eye. 



Gill-openings small, inferior, below origin of pectoral and forming a 

 '■ fold over isthmus well in advance of latter. 



First dorsal inserted a trifle before origin of pectoral, and furnished 

 with a long strong spine, well compressed, its anterior edge sharply 

 trenchant, and its length a little greater than head, possibly an eye- 

 <liatneter more. Posterior margins of dorsal spine with rather broad 



