34 CRUSTACEA MALACOSTRACA. II. 



than deep and much shorter than the second; fourth joint extremely long, almost four times as long 

 as the penultimate joint, which is conspicuously longer than second and third joints combined. 



Chelipeds somewhat long and slender (fig. 43). Carpus twice as long as the basal joint and 

 three times as long as deep. Chela a little less than half as long again as the carpus, four and a 

 half times as long as broad (fig. 4d); the fixed finger at the base somewhat broader than the movable 

 and keeping almost the same breadth to beyond the middle; the movable finger slender, tapering 

 from near the base to the end, and the fingers without any interval between them when their ter- 

 minal parts cross each other. 



Fifth thoracic segment slightly longer than the three preceding segments combined, or than the 

 sixth segment. The legs extremely long and very slender; second pair with the sixth joint, though 

 very long, scarcely as long as the sum of the two preceding joints but somewhat longer than seventh 

 joint with claw, and the claw almost twice as long as seventh joint. Third pair (fig. 4f) with the sixth joint 

 slightly shorter than the fifth and slightly longer than seventh joint with claw; the spur on fifth 

 joint is a very long, slender spine. Fourth pair in the main as the third pair; the spur on fifth joint 

 is a slender spine more than two-thirds as long as the sixth joint (fig. 4g) which is considerably 

 longer than seventh joint with claw. - Seventh pair (fig. 4h) with the sixth joint slightly longer 

 than the fifth and about two and a half times as long as seventh joint with claw. 



Abdomen slightly longer than seventh, sixth and half of the fifth thoracic segment combined. 

 Pleopods with slender rami and long setae. - Uropods long and very slender (fig. 41); the endopod 

 with the proximal joint somewhat longer than the distal; the exopod reaches a little beyond the 

 middle of the distal joint of the endopod, but its division into two joints could not be perceived with 

 certainty; one of the terminal setae of the exopod is nearly three times as long as the ram us itself 

 and a little longer than the longest terminal seta of the endopod. 



Length of the immature female drawn (the marsupial lamellae are small) i.6o mm ; another female 

 without marsupium measures 1.95 mm . 



Remarks. P. longipes is easily distinguished from all other species of the genus by its ex- 

 tremely long and slender antennulaa, legs and uropods and the long and narrow chelae. 



It was taken at the station, where the trawl was filled with an enormous quantity of sponges, 

 and it is of interest to note, that Typhlotanais eximius n. sp., which possesses chelae more narrow and 

 longer than any other species of the genus, and besides a most curious, extremely long-legged species 

 of the sub-order Asellola have been taken at the same station. Judging from these facts I am in- 

 clined to suppose that such long-legged species have been developed under the influence of the en- 

 vironment, the sponges, and have been adapted to live on that peculiar ground. 



Occurrence. This species has been taken by the "Ingolf" at a single station. 



South-West of Iceland: St. 78: Lat 6o37' N., Long. 27 52' W., 799 fm., temp. 4.5; 3 spec. 



Paratanais Dana. 



This genus comprises at present nine species, but only a single form is known from the area 

 investigated. 



