544 THE VOYAGE OF H.M.S. CHALLENGER. 
The madreporiform body is rather large but indistinctly defined, and its surface is 
marked with a few coarse, deep, irregular furrows. It is situated at the summit of one 
of the sloping median interradial depressions above described. 
Colour in alcohol an ashy grey. 
Locality.—Station 166. Off the west coast of New Zealand. June 23, 1874. Lat. 
38° 50’ 0” S., long. 169° 20’ 0” E. Depth 275 fathoms. Globigerina ooze. Bottom tem- 
perature 50°°8 Fahr. ; surface temperature 58°°5 Fahr. 
Remarks.—Although the example described is a small and probably not fully grown 
specimen, its characters appear to. be sufficiently well marked to justify its being regarded 
as a distinct species. It is characterised by the delicate form, by the large plates with the 
compact groups of numerous spinelets, by the small but well-defined papular areas, by the 
distinct series of marginal plates, and by the character of the armature of the adam- 
bulacral plates. In these points Cribrella compacta is readily distinguished from Cribrella 
ornata. 
4. Cribrella obesa, n. sp. (Pl. XCVI. figs. 83 and 4; Pl. XCVIII. figs. 5 and 6). 
Rays five. R=70 mm.; r=13 mm. R>5r. Breadth of a ray near the base, 15 mm. 
Rays rather short, cylindrical, and with a short and swollen appearance, the shortness 
being emphasised by the recurved tips, and the swollen character by the presence of a 
deep and constricted sulcus in the median interradial lines, which gives the appearance of 
a small disk “with very tumid rays closely pressed together. ‘This, however, is in a great 
measure deceptive. The rays taper from the base to the extremity, which is not 
attenuate. 
The plates of the abactinal surface are small and their arrangement forms an open 
network. The plates are beset with small, low, robust, rounded papilliform spinelets, of 
which two short lineal series are usually present in each group, two or three of these 
groups and plates going to form the side of a mesh. Within the larger meshes there may 
be one, two, or more small plates, which seldom bear more than one of the small papilli- 
form spinelets or granules, and single isolated papule are present. On the margin of the 
abactinal area, and on the upper part of the lateral wall, the spinelets become more delicate 
and tapering. 
Rather low down on the lateral wall of the ray is a distinct narrow longitudinal 
line traversing the whole length, and composed of elongate, horizontally disposed 
plates, which I consider to be the representatives of a series of narrow supero-marginal 
plates. Immediately below this series is a series of small, vertically disposed, widely 
spaced plates, succeeded by another series of much larger plates, also vertically dis- 
posed, which I take to be the representatives of the infero-marginal plates. Between 
these and the adambulacral plates at the base of the ray are two or three longitudinal 
series of actinal intermediate plates, but these do not extend far along the ray, and 
