KEVIEW OF POLYIPNUS AND AKGYROPELECUS — SCHULTZ 141 



Paratypes. — U.S.N.M. no. 103028, 2 specimens, 1Y.5 and 21.5 mm, 

 Albatross station 5500, latitude 8°37'45" N., longitude 124°36'45'' E., 

 267 fathoms, August 4, 1909. 



Description. — The description is based on the holotype and the two 

 paratypes. Counts and measurements made as in other two new 

 species. Standard lengths 20 (17.5 and 21.5 mm) ; the number of 

 dorsal soft rays are 12 (12 and 12) ; anal rays 17 (17) ; pelvic fin 

 rays probably 7; pectoral fin rays 14 (14) ; gill rakers on anterior 

 margin of first gill arch 5 + 9 and 5 + 10 (5 + 11) ; abdominal plates 

 10 (10). The lanterns occur as follows: Branchiostegals always 6; 

 istlimus always 6; abdominals always 10; anals 9 (8 or 9), the last 

 organ usually rudimentary and very small; preanals always 5; 

 supra-anals always 3 ; suprapectorals always 3 ; subcaudals always 4 ; 

 supra-abdominals always 3; preopercular, postorbital, preorbital, 

 subopercular, and lateral organs always 1 each. Length of head 35 

 (33.5 and 34.3) ; length of snout 7.5 (6.9 and 7.9) ; width of bony 

 interorbital 6.5 (5.7 and 7.0) ; horizontal diameter of eye 17.5 (16.3 

 and 17.1) ; length from tip of snout to rear margin of maxillary 29.0 

 (28.0 and 28.5) ; length from tip of snout to origin of soft dorsal 

 60.0 (52.3 and 57.2) ; greatest depth of body 70.0 (62.9 and 64.0) ; 

 least depth of caudal peduncle 14.0 (11.6 and 12.0) ; length of caudal 

 peduncle 13.0 (13.1 and 14.0) ; length of longest gill raker on first 

 gill arch 10.0 (8.4 and 8.6) ; length of abdomen 42.0 (37.2) ; distance 

 from origin of soft dorsal to base of caudal fin rays 54.0 (51.3 and 

 51.4) ; length of base of dorsal fin 20.0 (16.3 and 17.1). 



Remarks. — This species differs from laternatus and asteroides in 

 the number of gill rakers, 5 + 9 to 11 instead of 7 to 8 + 14 to 16, 

 and in the size and arrangement of the photophores. The width of 

 the first three anal organs in triphanos equals the width of the last 

 3 1/2 to 414 organs, instead of 5 or 6 in laternatus. The second supra- 

 abdominal photophore is not in line with the third but is below it 

 a distance equal to its width, and the second is below the first a 

 distance equal to li/^ to 2 times the width of the first. 



The name triphanos refers to the characteristic position of the 

 three supra-abdominal photophores. 



SYNOPSIS OP THE SPECIES OF POLYIPNUS 



a' Minute teeth present on vomer and palatines ; posttemporal process of one 

 main spine, which is smooth and shorter than diameter of eye, usually 

 not longer than diameter of pupil ; at anterior end of anal series of pho- 

 tophores are 3 supra-anal photophores located much above general line of 

 anal organs. 

 &\ Anal organs 11 or 12; gill rakers on first gill arch about 8+14; vpidth of 

 first 3 anal organs equal to width of last 5 or 6 anal organs ; first and 



