on 
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THE VOYAGE OF H.M.S. CHALLENGER. 
9. Asterias cunninghanw, Perrier. 
Asterias Cunningham, Perrier, 1875, Révis. Stell. Mus., p. 75 (Archives de Zool. expér., t. iv. p. 339). 
Localities —Station 313. Near the Atlantic entrance to the Strait of Magellan. 
January 20, 1876. Lat. 52° 20’ 0” S., long. 67° 390” W. Depth 55 fathoms. Sand. 
Bottom temperature 47°°8 Fahr. ; surface temperature 48°°2 Fahr. 
Station 315. Port William, Falkland Islands. January 26,1876. Lat. 51° 40’ 0”S., 
ee Oo 
long. 57° 500” W. Depth 12 fathoms. Sand, gravel. Surface temperature 50°°0 Fahr. 
B. Asterias sulcifera group : Subgenus COSMASTERIAS, nov. 
10. Asterias (Cosmasterias) tomidata, n. sp. (Pl. CV. figs. 8-10). 
Rays five. R=92 mm.; r=19 mm. R<5r. Breadth of a ray near the base, 
21mm. Larger examples are in the collection, which measure about R= 110 mm., but 
are too much contorted in their present state for careful measurement. 
Rays elongate, robust, inflated, tapering gradually from the base to the pointed ex- 
tremity, which is rather attenuate. Disk rather small, more or less inflated, with deep 
contracted sulci on the outer part of the median interradial lines, the rays appearing 
closely crushed together at their base, and causing the disk to seem smaller than is really 
the case. At the base of the ray there is sometimes a transverse depression, emphasising 
the distinction of disk and ray. The interbrachial ares are acute. 
The abactinal area is covered with rather small plates, amongst which five recular 
longitudinal series may be defined, and two less regular series on each side of the median 
radial series. The median radial series forms a slightly raised rib which proceeds from 
the disk to the extremity, and each of the plates bears three or four small, short, trun- 
cate spinelets, with crowded membranous vesicles at their base. These spinelets are not 
definitely arranged, although their general disposition forms an irregular transverse series. 
Small isolated forcipiform pedicellarize are present with each group. On the small plates 
which succeed the median radial series there are not more than one or rarely two 
spinelets, and small isolated forcipiform pedicellarie. Owing to the small size and the 
irregularity in position of these plates, the spinelets in this region have a tendency to form 
an indistinct reticulation. The plates of the two succeeding series, which form regular 
longitudinal lines along the ray, may bear two or three spinelets, accompanied by isolated 
forcipiform pedicellaria. Between the outermost series of these plates and the adambu- 
lacral plates there are at the base of the ray about four longitudinal series of small con- 
tingent plates, which bear larger and more robust spines than elsewhere on the test. At 
the base of the ray these actinal spines form transverse series of four, but doubling is not 
unfrequent, and the arrangement shows a tendency to fall into oblique pairs ; and on the 
