620 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



lion 452(3) : Oregon station 1073(2), 1168(4), 1273(2), 1370(11), 1440(3); Pel- 

 ican station 53(1), 58(1 ). 



Description: Counts made are given in table 1, p. 591, and table 

 5, p. (117. 



Range: The species is commonly taken at depths of from 100 to 

 1,000 fathoms in the Pacific, Atlantic, and Indian Oceans, but many 

 records exceed 1,000 fathoms. Of SIO numbers H53-371, taken at 

 hit. 32°8' N., long. 142°4' E., over the Japan Trench, one specimen 

 was taken between the surface and 4,455 fathoms; of SIO H53-307 

 taken at lat. 39°34'~23' X., long. 142°29.5'-51' W., one specimen was 

 taken between 2,500 and 2,700 fathoms, the latter record being also 

 the most northerly latitude for the species in the Pacific. In the At- 

 lantic the deepest records are for Oregon station 1273 at 1,600 fathoms 

 and Albatross station 2101 (USNM 33563) at 1,686 fathoms. The 

 most northerly record for the Atlantic is MCZ 37662 taken at lat. 

 42°46' X., long. 63°22' W. 



Genus Polyipnus Giinther 



Polyipnus Giinther, Report of the scientific results of the voyage of H.M.S. 



Challenger during 1873-76, vol. 22, p. 170, 1887 (type species Polyipnus 



spinosus Giinther). — Haneda, Pacific Sci., vol. 6, No. 1, pp. 13-16, 1052 



(light organs). 

 Acanthopolyipnus Fowler, Proc. Acad. Nat. Sci. Philadelphia, vol. 85, p. 257. L93 I 



(type species Polyipnus fraseri Fowler). 



Species referable to the genus Polyipnus have the following charac- 

 ters in common: Abdominal vertebrae 11; caudal vertebrae 21 to 25: 

 branched caudal fin rays 9 + 8; pectoral rays ii,10-ii,15; dorsal rays 

 11 to 17; anal rays 13 to 19; gill rakers on first gill arch 4 to 10 + 6 to 18. 



The number of organs in groups of photophores are as follows: 

 Abdominal 10, anal 4 to 17, branchiostegal 6, isthmus 6, lateral 1, 

 preanal 5, preopercular 1, preorbital 1, postorbital 1, subcaudal 4, 

 subopercular 1, supra-anal 3 when present, supra-abdominal 3, supra- 

 pectoral 3. For the location of the groups of photophores see figure 1. 

 p. 588. 



Premaxillary and maxillary finely denticulate teeth pointing out- 

 ward and backward; dentition in both jaws in two or three rows; 

 dorsal blade represented by a pair of small diverging bony keels end- 

 ing in spines at front base of dorsal fin ; posttemporal with one or more 

 spines projecting posteriorly, and dorsal ridge of posttemporal may 

 bear spines; bony preopercular edge may be spiny and a long or short 

 spine occurs at posteroventrai corner of preopercle; ventral odi^v of 

 abdomen may be denticulate. In adults spiny ridges may develop 

 around anal region and on ventral edge of caudal peduncle; a pair of 

 diverging spines at pelvic bases; pectoral shield usually with ventral 

 edge denticulate; teeth present on vomer and present or absent on 



