FISHES FROM NORTHEASTERN PACIFIC — CHAPMAN 505 



POL= Posterolateral organ(s), macula(e) posterolateralis, between the 

 lateral line and the gap between the two series of AO. 



PRC = Praecaudal organs, maculae praecaudalis, along the base of the 

 lower lobe of the caudal fin and along the posteroventral surface 

 of the caudal peduncle. 



The series of luminous scales along the dorsal and ventral side of the 

 caudal peduncle in some of the fishes are called respectively the 

 supracaudal and infracaudal series. 



In treating the stomiatoid fishes the luminescent organs of the 

 lateral, ventral, and caudal series have been described (after Parr, 

 1927, p. 23, fig. 19) as follows: 



The upper, or lateral, series is divided into — 

 0-'V=Photophores present between the gill opening and a perpendicular 



from the base of the ventral fin. 

 V-A = Photophores between the perpendicular from the base of the ventral 

 and the beginning of the single caudal series (A-C) . 



The lower, or ventral, series is divided into — 

 I-P=Photophores anterior to the base of the pectoral fin. 

 P-V = Photophores between the bases of the pectoral and ventral fine. 

 V-A=Photophores from below the base of the ventral to the beginning of 

 the single caudal series (the A-C). 



The "length" in the descriptions is, unless specifically stated other- 

 wise, the straight line from the tip of the snout to the bases of the 

 middle rays of the caudal fins, the "length without caudal." 



The "proportions of length" in the descriptions are the result of 

 dividing the particular measurement of the body into the length 

 without caudal. 



SYSTEMATIC ACCOUNT 



Order ISOSPONDYLI: Suborder Salmonoidei 

 Family BATHYLAGIDAE 



Genus BATHYLAGUS Gunther, 1878 



BATHYLAGUS ALASCANUS, new epecies 



Figure 58 



Types. — The holotype, a specimen 83 mm long without caudal 

 taken at station 444C, June 13, 1931, latitude 58°25' N., longitude 

 146°04' W., U.S.N.M. no. 108148, and 35 paratypes ranging from 27 

 to 81 mm in length without caudal taken at the following stations': 

 4B; 6C; 12B; 2lC; 184B; 189B; 218C; 234B; 236B; 256B; 258C; 

 267B; 290C; 293C; 303C; 324C; 326C; 336C; 338B; 384C; 391D; 

 407B; 447D.T.; 450C; 455D.T.; 456C; 457D.T.; 493D.T.; 495D.T.; 

 622C; 636C; 639C; 764B; 1116B. 



« For data on stations listed in this paper see Report No, 9, International Fisheries Commission (Thomp- 

 son and Van Cieve, 1936, table 16, pp. 134-160). 



