64 THE VOYAGE OF H.M.S. CHALLENGER, 
sea, 1600 fathoms. Temperature of the bottom, 0°8° C. Sea bottom, globigerina 
00ze. 
Station 300. December 17, 1875. Lat. 33° 42’ §., long. 78° 13’ W. Depth 1375 
fathoms. Bottom temperature, 1'5° C. Sea bottom, globigerina ooze. 
Of all the species of this genus known at present, this species of Colossendeis shows 
by far the greatest affinity with Colossendeis leptorhynchus, which I shall describe further 
on. ‘The latter species, however, is much more slender. 
Colossendeis leptorhynchus, n. sp. (Pl. VIII. figs. 3-7). 
Diagnosis.—Proboscis almost cylindrical. Cephalic part of the cephalothoracic seg- 
ment distinctly separated from the thoracic part ; eyes obsolete ; third joint of the palpus 
shorter than the fifth; palpus much longer than the body. Legs and _ proboscis 
extremely slender. Claws of the legs minute. 
Description.— 
Male Female 
Length of the proboscis, . - : . = 28mm. 33 mm. 
Length of the trunk with the Bpanren, : : ; : US cs 1: es 
Length of the abdomen, . ; 5 - ; - 2:25, 2593, 
Length of the palpus, . . » - . ; SD Gasih? Wolhew tes 
Length of the ovigerous legs, . eens 0 : 56) 5; SVG Ne 
Length of the leg of the third pair, : : : < HAS) ee pLOG. ys 
The body, and especially the proboscis and legs, are a great deal more slender than 
in Colossendeis gigas. The intervals between the lateral processes are not quite so wide 
as the thickness of these processes, The surface of the body is quite smooth, but the 
palpi and ovigerous legs, and the last five joints of the legs, are furnished with extremely 
small hairs. 
The proboscis is extremely long, more than twice as long as the trunk; about the 
middle it is slightly swollen. The cephalic part of the cephalothorax is distinctly 
separated from the thoracic part. It is elongated, a little more slender towards the end, 
and bears on the dorsal surface, about the middle, a small blunt knob as a rudimentary 
oculiferous tubercle. 
The four thoracic segments are closely united. The abdomen is small, about 1-18th 
of the total length of the body. The palpi are not very loug. ‘The first two and the 
fourth joints are extremely small ; the third is long, and the fifth a great deal longer still. 
The sixth joint is shorter than the seventh, and of the last three joints (fig. 5), the third 
is by far the longest. The relative lengths of the joints of the ovigerous legs is the 
same as in Colossendeis gigas, Hoek ; the sixth joint is again considerably longer than 
the fourth, and the fifth is extremely short. The last four joints decrease in length, and 
the claw is very small (fig. 6). 
The first three joints of the legs are very small, nearly as long as broad ; the following 
