286 DEEP SEA FISHES. 
papille along each side. Pseudobranchiz present. Opercles broad, thin, 
membranous at the margins. Skull bones rather thin and fragile. About 
eight pyloric cxca. 
Base of the dorsal nearly twice its length from the bases of the median 
rays of the caudal ; origin behind the middle of the body, little more than 
half the length of the head behind the operculum. Anal origin below the 
hinder extremity of the base of the dorsal. Caudal pedicel deep; caudal 
fin forked. Pectorals small, below the posterior margin of the operculum, 
Ventrals small, forward of the origin of the dorsal. Vent below the tenth 
ray of the dorsal fin. . 
Scales cycloid, broad, thin, with prominent concentric strize ; those of 
the lateral line much narrower than those at either side of it and forming 
but elongate covers for the tubes extended between. Lateral line carried 
well out toward the end of the caudal. 
Entire length about twelve inches. 
Black on body, head, fins, and linings. 
This is one of the most interesting types in the collection. It is be- 
cause of his particular interest in these fishes that the species is introduced 
in the Professor’s name. 
Station, Latitude, Longitude. Depth. Temperature, Bottom. 
3398 WET Iie 80° 21’ W. 1573 fathoms 36° F. Gn, Oz, 
Bathytroctes alvifrons sp. n. 
Plate LVUI. fig. 2, 2a. 
Br.r.7; D.13 (to14); A.12(to11); V.7; P. 113 L1. 44; Ltr..4+.1+ 5. 
Form moderately slender, pointed anteriorly, compressed, depth one half 
of the length of the head. Head rather sharp forward, broad on the occi- 
pital region, narrowing downward, length about one third of the distance 
from the snout to the base of the caudal; crown with a wide deep trough- 
like groove from nape to nostrils between ridges that are nearly parallel 
throughout. Snout as long as the eye, blunt, swollen around the mouth, 
narrow above the nostrils, concave from the nostrils to below the eye, slightly 
convex from snout to forehead. Eye large, three tenths of the length of the 
head, twice the width of the interorbital space. Mouth wide; maxillary 
extending below the anterior two thirds of the eye, tooth-bearing, broad pos- 
teriorly and rounded at the end, forming nearly two thirds of the upper margin 
of the mouth ; intermaxillary expanded forward in a scalloped edge. Teeth 
