66 THE VOYAGE OF H.M.S. CHALLENGER. 
certain extent the characteristics of Colossendeis gigas, and in other respects those of 
Colossendeis leptorhynchus. I therefore wish to consider it as an intermediate form. Its 
dimensions are as follow :— 
Length of the proboscis, . : : : : : 26 mm. 
Length of the trunk with the ahaa, : F : < : 18>; 
Length of the palpus, i : ; A - 4 334 ,, 
Length of the ovigerous leg, : 5 ; : : q 
Length of the leg, . 5 ; 2 F 5 ; c 37 +,, 
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 palpus, and that of the whole palpus, isthe same as in Colossendeis 
leptorhynchus, viz., the third joint of the palpus is 8°5 mm., and the fifth 14mm. 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 with legs only 
furnished with extremely small hairs. 
Habitat.—This curious form was dredged at Station 158, March 7, 1874. Lat. 
50° 1’ §., long. 123° 4°E. Depth of the sea, 1800 fathoms. Bottom temperature, 
03° C. Sea bottom, globigerina ooze. 
Colossendeis robusta, nu. sp. (Pl. 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, . : : : - : 15 mm. 
Length of the trunk with the seen: : : . : : ile} Be 
Length of the abdomen, : ~ : : é é : 3°5,, 
Length of the palpus, : : 3 : 3 ; : PAI, 
Length of the ovigerous legs, " . - : . 6 BPI op 
Length of the leg of the third pair, < é = : ae 113"; 
Only a single specimen of this beautiful 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. : 
