()02 



BULLETIN OF THE UNITED STATES FISH COMMISSION. 



nating in a i^pine diivrted downward and Ijai-kward, with a sliort spint- at its base behind; in front nf 

 tlie spine, the margin iif tlie plate is niinntely serrnlate; tlie plate before the dorsal fin is formed by 

 fusion of the 7 i)7Y)truding interspinals, whieh are regularly graduated in length, the last two of eijual 

 length and closely ajiposed. the others evenly spaced; no trace of an adipose dorsal fin; anterior anal 

 ray under last ray nf ilcrsal; distance fioni last anal ray to first rudimentary caudal ray slightly 

 exceeding length of anal base; the anal consists of (i closely-set anterior rays and 5 more widely-spaced 

 shorter posterior rays; pectorals long, reaching base of ventrals. The ventrals are injured, but one tin 

 being present, and in such condition that it can not be described. Caudal gently forked. 



The genus Ariji/rupchTiix is supposed to be scaleless, but the species here described is c(_)vered with 

 e-xtremely thin, higli and narrow scales, wholly similar to those of Poliiijiiiiis. But few <if the.-^e scales 

 remain, in scattereil patches, in the ty]ie. Where they have Ijeen lo.st, no scale pouches are evident. 



Photophores arranged as in other species of the genus: A group of 4 at the base of the lower caudal 

 lobe, a group of 6 above the fifth to nintli anal rays, the distance separating these groups nearly twice 

 the length of the anal series; a series of 4 between ventrals and anal, and a series of 12 along the 

 ventral margin, betv\een pectorals and ventrals; aliove the p(jsterior fiortion of the ventral series is a 

 second horizontal row of (S spots, on a level with the base of the pectorals, and in advance of these are 

 2 spots at a higher level, the posterior higher than the anterior; a small spot behind lower margin of 

 orbit, one behimi and one before preopercular angle, a series of 6 on each side of breast in front of 

 pectoral fins, and a series of 6, one at the base of each liranchiostegal membrane; each sjiot or group 

 of s[iots has a deeply pigmented area above it. 



Color; Greater piart of head and trunk blackish, middle of trunk with silvery sheen; snout and 

 mandible largely translucent; caudal peduncle whitish, witli a.'-eries of small black spots along anterior 

 half of nnddle line, a dark lilotch (jn middle line at base of caudal fin, and a black area in connection 

 with each group of photophores; fr(.)nt of mouth whitish, back of mouth and gill cavity jet-black. 



The stomach was everted in the tyjie, indicating that it came from a considerable depth. But one 

 S[)ecimen was secureil. 



I-amilv CH.\LLI()DOi\TID^. 



Cyclotlioiie rliodadenia, ricw species. Plate 71, fig. 1. 



Type, a female, 192 mm. long (excluding caudal ), fmrn station 410S, Kaiwi Channel, depth 411 to 

 442 fathoms; tyi)e. No. 51584, U.S. Nat. Mus. 



Very closely allied to C. elongata ((iiinther) ( Deep-Sea Fishes, Challenger, p. 17o, pi. 45, tig. B), 

 from the Indian Ocean south of New (iuinea, differing in the more mnnerous branchiostegal rays, the 

 more posteriorly inserted ventrals, the more anteriorly placed adipo.se dorsal, the development of the 

 glandular areas on caudal peduncle, and minor details in number and arrangement of lateral 

 plKitophores. 



D. 14; .V.oOor.'il; P. lltolo; V. S. Tlie type and the single cotype measure respectively 192 mm. 

 and 76 mm. in total length, exclusive of caudal tin. Below is a table of comparative measurements, 

 expressed in hundredths of this length. 



Total length without caudal 



Length of lioad (in hundredths) 



Snout 



Orbit 



Interorbital width 



Length of mouth to tij) of maxillary 



Length of mandible ." 



Cireatesl (leptll of body 



Least depth ()f ealidal peduncle 



I)i--tanee from snout to dorsal 



Hasi- of dorsal 



Instil nee ttetween dorsals 



From front of adipose to base of middle caudal rays 



Distance from snout to ventrals ". . 



Ventrals to anal 



Base of anal 



('audal peduncle behind anal 



Length of pectorals 



Length of ventrals 



Type. 



■mill. 

 192. 

 21.5 

 4.0 

 2,8 

 4.0 

 17.5 

 18.5 

 14.0 

 4.0 

 5K.0 

 11.0 

 14.0 

 18.5 

 44.0 

 13.0 

 37.0 

 9.0 

 9.0 

 8.0 



Single 

 cotype. 



Ill lit. 



7(i.O 



22. 5 



4.0 



3.2 



3.0 



19.0 



19.0 



1.5.5 



4.6 



58.0 



11.0 



12.5 



19.0 



44.0 



11.5 



37.0 



11.0 



8.6 



9.0 



