145 
have numerous hairs disposed on the surface, the more distal segments having hairs almost 
exclusively round the base of each following segment. 
The second cirrus also has very unequal rami: the short ramus has 7 segments and 
looks as if it was truncated at the extremity; the long one has 20 segments, increasing slightly 
in length, but decreasing considerably in breadth towards the extremity of the ramus. Shorter 
ramus and lower 6—7 segments of the longer ramus thickly clothed with hairs. 
The third cirrus has shorter rami than the 4t®—6‘ cirri. Surface of the lower 10 
segments densely clothed with hairs in both rami. Number of segments 16 in the shorter, 18 
in the longer ramus. 
The fourth-sixth cirri have slightly longer rami — but even these cannot be said 
to be very long. The number of segments seems to increase from the 3 to the 6: at 
least I found in a specimen the following numbers: 
SIECihUSE elms LO ald: Tossegiients 
AUS ers 0). 19) and 20nseements 
FUTCIEEUSH, 3 4 9 22 .and 22 segments 
GN cinch =) #23) atid! 24 seoments. 
All the segments of the 4—6" cirri bear at the anterior side two pairs of stronger 
and a third pair of delicate bristles; at the posterior side near the extremity of each segment 
a few delicate spines, which on the more distal segments are almost rudimentary. 
The caudal appendage is very slender; I counted 25 segments in one of them. 
Length of last segments (PI. XIII, fig. 13) about four times their breadth. 
The penis is thick, broad at its base, tapering towards the extremity. It is distinctly 
ringed and bears delicate hairs scattered over its surface; at and near the extremity, the hairs 
‘are disposed much more densely. 
This species was collected at: 
Stat. 74. June 8, 1899. Lat. 5°3'.5S., Long. 119°0’ E. Depth 450 m. Bottom: Globigerina 
ooze (obviously a thin layer). Numerous specimens attached to the spines of 
Cidaris ( Histocidaris) elegans Alex. Agassiz. 
Stat. 267. December 20, 1899. Lat. 5°54'S., Long. 132°56'.7 E. Depth 984 m. Bottom: grey 
mud with a brown upper layer. Six specimens, two of them attached to a spine 
of Crdaris mtsakiensis Yoshiwara, the others loose; the latter have also been 
attached to a cylindrical object. 
Stat. 297. January 27, 1900. Lat. 10°39 S., Long. 123°40’E. Depth 520 m. Bottom: soft 
grey mud with brown upper layer. One specimen attached to a spine of Czdaris 
japonica Doderlein. 
General Remarks. This is a very peculiar species of Verruca. It shows some 
resemblance to V. radiata Gruvel in the structure of the moveable valves, although the articular 
ridges of the scutum, which in V. radiata are very narrow, are quite broad in V. grex. 
The shape of the fixed valves and of the rostrum and carina especially, is quite different from 
what we find in other species of the genus. 
The number of specimens on the same spine of a Czdarzs is sometimes considerable. 
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SIBOGA-EXPEDITIE XXXIa@. 19 
