6 ART. 4.— BASHFORD DEAN. 



55 were counted) «and smaller. Incidentally, the sheath of the frontal 

 organ is longer, and from the great length of the socket-like depres- 

 sions, which form sheaths for the superjacent denticles, one can reaso- 

 nably conclude that the snout of " Harriotta " was capable of consider- 

 able vertical movement. 



From our present knowledge H. raleighana and " H." pacifica dif- 

 fer from one another in the following regards : 



H. raleighana Goode and Bean. 



Head length, measured from in front of gill opening, constitutes 

 one fourth that of entire animal. Snout tapers somewhat suddenly. 

 Paired fins broad at bases thence narrow acutely. Second dorsal fin 

 low, with margin nearly straight. Dorsal lobe of caudal fin with well 

 marked dermal rays. Series of conspicuous dermal tubercles situated 

 along the dorsal region of the trunk, near the unpaired tin. 



".fiT." pacifica Mitsukuri. 



Head length about two sevenths that of entire animal. Snout 

 tapers gradually, i.e., in verp acute angle. Paired fins narrow and 

 long. Second dorsal fin high, with margin rounded. Dorsal lobe of 

 caudal fin fleshy with indistinct dermal rays. Dermal denticles along 

 dorsal margin of caudal fin, but absent on the trunk. In addition to 

 these characters the present species has thin, flat tritorless dental 

 plates, produced ectad so as to form a sectorial mouth-rim. Also an 

 undivided mixipterygium. The corresponding features in raleighana 

 have not as yet been described. 



U. Integument. 

 The only dermal denticles observed in the female specimen are 

 scattered along the dorsal rim of the caudal fin.«.- Over fifty of these 

 were counted, situated at irregular intervals (about 3-5 mm.) apart. 



1) Cf., however, Carman's recent paper, op. eil. 



