REPORT ON THE PYCNOGONIDA. 65 



three are very long aud slender, and not inconsiderably curved. Their relative length 

 is the same as in Colossendeis gigas. Of the last two joints, the first is longer than the 

 second. The claw is small. 



Of this species seven adult and two young specimens were dredged during the 

 cruise of H.M.S. Challenger. By stretching out the legs parallel wth each other, the 

 body of the animal assumes a very peculiar aspect.^ Of the eight adult specimens, 

 seven are females — one only a male. Both the females and the male have genital 

 openings only on the two hindermost legs, where they are j^laced on the ventral surface 

 of the second joint of the leg. Perhaps the ovigerous legs of this species, and in that 

 case probably of the other species of this genus also, have lost their egg-bearing function. 

 Small capsules filled with numerous eggs were attached to several joints of the legs, 

 but as these eggs were quite undeveloped, it was impossible to determine whether they 

 belong really to this animal, or to some other inhabitant of the same locality. The 

 capsules, I observed, were attached to the fourth joint of the leg in a female, and to the 

 second joint of the leg in the single male specimen. 



Habitat. — This species was dredged at the same stations a.s the foregoing species 

 {Colossendeis gigas), and also at a fourth station (310). 



Station 146. December 29, 1873. Lat. 46° 46' S., long. 45° 31' E. Depth of the 

 sea, 1375 fathoms. Temperature of the bottom, 1*5° C. Sea bottom, globigerina ooze. 



Station 147. December 30, 1873. Lat. 46° 16' S., long. 48° 27' E. Depth of the 

 sea, 1600 fathoms. Temperature of the bottom, 0-8° C. Sea bottom, globigerina ooze. 



Station 300. December 17, 1875. Lat. 33° 42' S., long. 78° 13' W. Depth of the 

 sea, 1375 fathoms. Temperature of the bottom, 1'5° C. Sea bottom, globigerina 

 ooze. 



Station 310. January 10, 1876. Lat. 51° 30' S., long. 74° 3' W. Depth of the 

 sea, 400 fathoms. Temperature of the bottom, 7-9° C. Sea bottom, mud. 



Observations — This species is distinguished from the fijregoing by its much more 

 slender form and shorter palpus. From Colossendeis angusta, G. 0. Sars (Arch. f. 

 Math, og Naturvid., vol. ii. p. 268, 1877), and other species, it may be easily distinguished 

 by the dimensions of the joints of the palpus ; for, as far as 1 know, Colossendeis 

 leptorhijnchiis is the only species of this genus which has the fifth joint of the palpus 

 considerably longer than the third. The form of the cephahc part of the cephalothorax, 

 and the extremely small claws at the ends of the legs indicate, I believe, a near relation- 

 ship between this species aud Colossendeis gigas. 



Colossendeis gigas-leptorliynchus. 



A single specimen — unfortunately defective — dredged at Station 158, shows to a 



1 This, of course, refers to the animal preserved in s^jirits. I observed the same thing in living specimens of Kympho-n- 

 gradle, Leach, and Pallene brevirosiris, Johnston. 



(ZOOL. CHALU EXP. — PART X, — 1881) K. 9 



