704 
Proceedings of the Royal Society 
that form will be readily seen on comparing the summary given above 
with that of M. Perrier. 
I have great pleasure in naming this interesting species after 
Captain Tizard, R.N., under whose command the “ Knight Errant” 
cruise was conducted,— an officer to whom science is much indebted 
for many services and contributions, amongst the foremost of which 
may be mentioned the important hydrographic investigations on 
board H.M.S. “ Challenger.” 
7. Cribrella ocidata (Linck), Forbes. 
Station 3. Aug. 3 and 4, 1880. Lat. 59° 12' N., long. 5° 57' 
W. Depth, 53 fathoms. A single example. 
8. Crossaster papposus (Linck), Muller and Troschel. 
Station 3. Aug. 3 and 4, 1880. Lat. 59° 12' N., long. 5° 57 
W. Depth, 53 fathoms. Two examples. 
One large specimen having thirteen rays, R=122 millim., r = 45 
millim. ; and the other a small one with twelve rays. 
9. Crossaster papposus , var. septentrionalis, n. 
Station 2. July 29, 1880. Lat. 60° 29' 1ST., long. 8° 19' W. 
Depth, 375 fathoms; bottom temperature, 31° Fahr. ; surface tempera- 
ture, 53° Fahr.; mud. A single example. 
An interesting variety was dredged at Station 2 in 375 fathoms, 
which on account of its well-marked character I consider desirable 
to recognise by name, — a course further justified by its constancy 
over a considerable area of distribution. In proposing this step, 
however, I wish to state clearly that I do not regard the form as 
specifically distinct from Crossaster papposus. The form is ten rayed, 
and accords in this and other particulars with a number of examples 
taken at different stations during the “ Porcupine ” cruise. The 
chief characters are persistent throughout the whole series of speci- 
mens that I have examined ; several, however, are present in an 
extreme degree in the specimen under notice, of which the following 
may be taken as a brief description : — 
Rays ten, short, broad at the base, and sharply tapering, radial 
proportions = R < 2 r ; R = 35 millim., r— 18 millim. Dorsal sur- 
face of the disk gibbous, sloping rather quickly at the base of the 
rays. Paxillae small, numerous, closely crowded, with 10 to 21 
spinelets, which are more or less divergent from the pedicel. 15 to 17 
paxillse may be counted in a median interradial line and about 10 
