CHRISTIANIA V1DENSK.-SELSK. FORHANDL. 1883. No. 7. 



27 



2ik1 pair of legs mach sraaller thaii in Th. gregaria, by no means 

 attaining half the length of the body, when fully extended. Telson 

 rather elongated and nmch narrowed posteriorly. Inner lamella of 

 the nropods much longer than the outer, and snrpassing the tip of 

 the telson. Length: 13 mm. 



Hul. Antaretic ocean near the ice barrier, and off Kerguelen; 

 snrface. 



Gen. 5. Nematosc e I is 1 n. 



Generic characters. Form of body and structure of eyes and 

 antennæ almost as in Thysanoéssa. Mandibnlar palpus very small. 

 Terminal joint of 2nd pair of maxillæ poorly developed. Ist pair 

 of legs slender. with the last joint compressed and provided with 

 a row of ciliated spines. 2nd pair of legs greatly elongated and 

 very narrow, filiform, almost qnite nacked, only last joint provided 

 with a few setæ, forming a small brush at the tip of the leg. 

 The subsequent pairs of legs mach smaller and stouter than the 

 Ist, with the terminal portion very short. 7th pair of legs with 

 the stem small, twojointed. Last pair quite rudimentary, only for- 

 ming a broad seåferous lamella (exopodite). Most of the bran- 

 chiæ sending off a narrow branch on the ventral face, the 2 poste- 

 rior pairs very complex. Phosphorescent organs as in Thysanoéssa. 



Remarhs. This new genas is nearest allied to Thysanoéssa, 

 bat is readily distingnished by the strnctare of the legs, especially 

 the greatly elongated and filiform 2nd pair. 4 different spedes of 

 this genus are represented in the 'Challenger' collection. 



31. Ncmatoscelis nunjalops n. sp. 



Body rather stoat, tapering posteriorly. Carapax withoat any 

 lateral denticle, anterior part keeled above; rostram very narrow. 

 sabnlate, and generally carved downward at the tip. 4th and 5th 

 postabdominal segments slightly keeled above. Last segment lon- 

 ger than the preceeding; præanal spine simple, ungviform. Eyes 



1 Derived from VlQJI.a: a thread and ØXfiXlC ; a shin-bonf . 



