CRUvSTACRA MAI,ACOSTRACA. II. 



49 



than second pair, because fourth, fifth and sixth joints are conspicuously shorter than in the last- 

 named pair; the distal anterior setae on fourth, fifth and sixth joints somewhat long, and in one spec- 

 imen the distal posterior seta on fourth joint was very long; seventh joint with claw distinctly more 

 than half as long as sixth joint Three posterior pairs of legs (fig. 70) with second joint about three 

 times as long as broad; fourth joint (fig. yc) with two distal short spines on the anterior side; fifth 

 joint somewhat thick, with a rounded expansion on almost the distal half of the anterior margin and 

 a few tiny spinules on that expansion; sixth joint about as long as the fifth plus half of the fourth, 

 twice as long as seventh joint with claw. 



Abdomen not fully as long as the two preceding segments combined, but a little broader than 

 the last thoracic segment. -- Uropods somewhat long and slender (fig. yd); endopod with the proximal 

 joint a little or slightly longer than the distal; exopod distinctly longer and more slender than the 

 endopod, two-jointed, and the distal joint almost twice as long as the proximal. 



Length of a female with marsupium and of the largest female without marsupium 2.4 mm . 



Sub adult Male. The antennulse are thick (fig. ac); first joint only a little more than three 

 times as long as deep and tapers a little towards the end; second joint about as long as deep; third 

 joint with the proximal half somewhat thickened below. Ventral process on second thoracic segment 

 well developed (fig. 2c). Abdomen a little longer than the two preceding segments combined. 



Remarks. T. variabilis is easily distinguished from all other species of Typhlotanais men- 

 tioned here or found at Norway by having the exopod of the uropods distinctly longer than the 

 endopod. In various features it is allied to T. penicillatus. 



As to the variation in presence or absence of a ventral process on second thoracic segment I 

 refer to the statements on p. 7. 



Occurrence. T. variabilis has been taken by the "Ingolf" at three stations, all in the cold 

 deep-sea area. 



North of the Faeroes: St. 139: Lat. 63 36' N., Long. 7 30' W., 702 mi., temp. -=- 0.6; 3 spec. 



East of Iceland: St. 105: Lat. 65 34' N., Long. 73i'W., 762 fm., temp. -=- 0.8; 3 spec. 



St. 102: Lat. 66 23' N., Long. io26'W., 750 fm., temp. -=- 0.9; 2 spec. 

 (One of these specimens, represented in fig. 2 a, has a minute parasitic 

 Copepod (/) fixed on the base of second left leg.) 



30. Typhlotanais trispinosus u. sp. 

 (PI. V, figs. 4 a- 4 f.) 



Female (without marsupium). Body slender, nearly seven and a half times as long as broad 

 (fig. 43). - - Carapace about as long as the two following segments combined, somewhat longer than 

 broad ; its lateral margins converge slightly from near the base to somewhat from the front end where 

 they are more curved; the front end is a little more than half as broad as the carapace near its base, 

 and the rostral process is well developed, somewhat narrow, acute. 



Antennnlse (fig. 4 b) nearly or scarcely as long as the carapace, moderately slender. First joint 

 about three and a half times as long as deep, somewhat tapering and somewhat longer than the two 



The Ingolf-Expedition. III. ;. 7 



