368 PROCEEDINGS OF THE ACADEMY OF [May, 



width about f of least depth and least depth about 41 in its 

 length. 



Head rather deep, more elevated in proportion than that of 0. liexa- 

 cornis. It is also decidedly more narrow or angular when seen from 

 above. Snout rather short, blunt, rounded above, or more rounded 

 than in 0. hexacornis. Upper jaw protruding a little and also pro- 

 duced a little beyond mandible. Eye large, impinging on upper 

 profile, a little longer than deep, and its posterior margin a little 

 before center in length of head. Mouth large, corner or gape extend- 

 ing till about opposite anterior margin of pupil. Lips a little fleshy. 

 Maxillary long, reaching about opposite posterior margin of pupil, 

 and its distal expanded extremity equal to about f of horizontal 

 orbital diameter. Teeth rather large, conic, coarse, and in bands in 

 jaw^s. A patch also on vomer, though none on palatines or on 

 tongue. Tongue broad, thick, triangular and rounded tip free. 

 Buccal flaps rather narrow. Head cavernous, and with rather 

 prominent ridges. Nostrils with rather broad cutaneous rims, 

 anterior on side of snout and in about last third of its length. Pos- 

 terior nostril large, in interorbital space just before anterior margin 

 of orbit, and its margin large. Interorbital space narrow and con- 

 cave, IJ in orbit. Nasal spines 2, well developed, close together 

 and curving a little back. An osseous scabrous postorbital process 

 of large size on each side and another similar one on each side, only 

 larger, in occipital region. Opercular spines 3, upper two close to- 

 gether and both directed back. Lower opercular spine just below 

 second preopercular spine and directed down. Preopercular spines 

 4, large, uppermost longest or about |- of horizontal orbital diameter 

 and directed obliquely up and back, also perfectly straight. Third 

 preopercular spine inclined a little down and second vertical. First 

 opercular spine broad and directed forward. Two humeral spines 

 behind upper opercular spine, and 1 axillary spine just above base 

 of uppermost pectoral ray. ^Mandible cavernous. Ridges on head 

 all more or less rounded. Gill-flap not broad. 



Gill-opening rather large, extending forward till about opposite 

 middle of orbit. Rakers rather broad asperous tubercles, 1 + 6 on 

 fu'st arch. Filaments well developed, about equal to f of horizontal 

 orbital diameter. Isthmus broad and flattened. Branchiostegal 

 rays 6. 



Body covered with smooth skin. Head with exception of spines 

 and processes covered with smooth skin. On back on each side of 

 median line an irregular double series of scabrous tubercles extending 

 from neck to upper part of caudal basally. L'pper edge of pectoral 



