226 



The basipodites of the uropods are considerably longer than the 

 endopodites; the exopodites are relatively well developed and the same 

 size in uropods II and III but slightly smaller in uropods I; all the 

 exopodites are considerably shorter than the endopodites. In uropods I 

 the anterior margin of the basipodite is denticulate while the posterior 

 margin of the uropod is armed with a small number (4-5) of strong 

 straight spines. In uropods II the distal part of the anterior margin of the 

 basipodite is denticulate, and distal to the base of the exopodite a large 

 recurved denticle-lobe occurs on the inner margin, which has a finely 

 denticulate inner margin. The telson is rounded and its width greater 

 than its length. 



Distribution: This is a widely distributed but rare species. It is known 

 from a few specimens caught near the Canary Islands, at the Cape of 

 Good Hope, in the tropical regions of the Indian Ocean (the Seychelles), 

 and its Antarctic regions (55°27' S, 28°59' E, 65°06' S, lir24' E), as 

 well as in the southern (30° 32' S, 176° 38' W), eastern equatorial and 

 northwestern (between 49° and 43° N, 152° and 158°30' E) regions of 

 the Pacific Ocean. It is found in catches from depths of 700, 500-1,000, 

 950-1,500, 2,200-5,250 m and in through catches from depths of over 

 1 ,000 m to the surface. 



2. Ctenoscina tenuis Wagler, 1926 (Fig. 95) 



Wagler, 1926: 431. 



Length of sexually mature female 3.5 mm. 



Dorsal denticles are present on all the pereon somites, pleon and 

 urosomite I; the denticles on the first three pereon somites are short, and 

 the one on somite I is stretched forward; all the denticles are smooth. 

 The head has forwardly directed spines located under antennae I. 



The strong antennae I are armed with spines on the inner and outer 

 edges; antennae II are absent in both males and females. The mouth cone 

 is small. Maxillae I have a distally tapering inner lobe. In maxillae II the 

 outer lobe terminates in one spine and the inner lobe in two spines. The 

 maxillipeds have oblong-oval outer lobes carrying small marginal setae 

 on the inner margin. 



Coxal plates I-V have acute angles. 



Pereopods I and II are the same as in C. brevicaudata. Pereopods III 

 and IV have similar proportions; the length ratios of the 2nd, 4th, 5th, 

 and 6th segments are 24:10:22:16; the inner margin of the three distal 

 segments is slightly denticulate; the claw is small and retractile. The 

 long and broad 2nd segment of pereopods V is armed with seven large 

 denticle-lobes, as in C. brevicaudata; the anterior margin has small den- 

 ticles; the broad lobelike distal prolongation of the 2nd segment is very 

 long, nearly reaches the distal end of the 4th segment, and is divided into 

 four large denticle-lobes; the 4th, 5th and 6th segments are roughly equal; 



