66 



THE VOYAGE OF H.M.S. CHALLENGER. 



certain extent the characteristics of Colossendeis gigas, and in other respects those of 

 Colossendeis leptorhynchiis. I therefore wish to consider it as an intermediate form. Its 

 dimensions arc as follow : — 



As I consider that this specimen is not quite adult, I will not give a detailed de- 

 scription of it. I only wish to point out that the form of the proboscis, though a little 

 more slender, quite agrees with that of Colossendeis gigas, whereas the relative length 

 of the joints of the ^^alpus, and that of the whole palpus, is the same as in Colossendeis 

 lejitorhynchiis, viz., the third joint of the palpus is 8'5 mm., and the fifth 14 mm. The 

 total length of the palpus is only three-quarters the length of the body. 



The specimen is a young female, with the body almost smooth, and mth legs only 

 furnished with extremely small hairs. 



Habitat. — This curious form was dredged at Station 158. March 7, 1874. Lat. 

 50° 1' S., long. 123° 4' E. Depth of the sea, 1800 fathoms. Bottom temperature, 

 0'3° C. Sea bottom, globigerina ooze. 



Colossendeis rohusta, n. sp. (PI. IX. figs. 4, .5). 



Diagnosis. — Proboscis club-shaped, shorter than the trunk. Body and legs rather 

 stout, with large intervals between the lateral processes for the insertion of the legs. 

 Palpi not very long, a great deal shorter than the body, with the third joint longer than 

 the fifth. Legs not very slender, furnished with a claw, which is almost half as long as 

 the second tarsal joint. Oculiferous tubercle conical, with four eyes. 



Description. — 



Length of the proboscis, . 



Length of the trunk with the abdomen. 



Length of the abdomen. 



Length of the palpus. 



Length of the ovigerous legs, 



Length of the leg of the third pair, 



Only a single specimen of this l^eautiful and robust form was dredged. All the 

 segments of the body are closely united, the cephalic part is comparatively short, and 

 bears a conical, robust, not much elevated, oculiferous tubercle. This tubercle shows four 

 distinct eyes, two of which are large and directed forwards, while the two small ones are 

 directed backwards. 



