286 BEEP SEA FISHES. 



papillne along each side. PseudobranchijB present. Opercles broad, thin, 

 membranous at the margins. Skull bones rather thin and fragile. About 

 eight pyloric ca^ca. 



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 stria? ; 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 jiarticular interest in these fishes that the species is introduced 

 in the Professor's name. 



station. Latitude. Longitude. Depth. Temperature. Bottom. 



3398 1° 7' N. 80° 21' W. 1573 fathoms 36° F. Gii. Oz. 



Bathytroctes alvifrons sp. n. 

 Plate LVIII. fij.2,2a. 



Br.r. 7; D. 13 (to 14); A. 12 (to 11); V. 7; P. 11; Lh44; 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 ; crowij 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 foreliead. 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 ; intenuaxillary expanded forward in a scalloped edge. Teeth 



