544 THE VOYAGE OF H.M.S. CHALLENGER. 



The niadreporiforni 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 convpacta is readily distinguished from Cribrella 

 ornata. 



4. Cribrella obesa, n. sp. (PI. XCVI. figs. 3 and 4 ; PI. XCVIII. figs. 5 and 6). 



Rays five. R = 70 mm. ; r = 13 mm. R>5 r. Breadth of a ray near the base, 15 mm. 



Ra) r s 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 papulae 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-rnarginal 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 





