REPORT ON THE ASTEROIDEA. 547 



are closely studded with conical spinelets, which give the surface a very echinulate appear- 

 ance, and almost mask its presence. 



Colour in alcohol, a dirty light brownish grey. 



Locality. — Station 148. Off the Crozet Islands. January 3, 1874. Lat. 46" 47' 0" S., 

 long. 51° 37' 0" E. Depth 210 fathoms. Hard ground, gravel, shells. Surface tempera- 

 ture 41°-0 Fahr. 



Remarks. — This species is distinguished from all the species with which I am 

 acquainted by the peculiar secondary network on the abactinal surface, the meshes of 

 which are filled up with smaller plates. The extremely small microscopic spines borne on 

 the abactinal plates, and the subregular well-defined series of actinal intermediate plates, 

 also furnish marks by which the species may be recognised. 



6. Cribrella simplex, n. sp. (PL XCVII. figs. 5 and 6 ; PI. XCVIII. figs. 9 and 10). 



Eays five. R = 27 mm. ; r = 6 mm. R = 4o r. Breadth of a ray at the base, 

 6*25 mm. 



Rays elongate, rounded, perfectly cylindrical, tapering gradually but slightly from the 

 base to the extremity, which is obtuse. Disk small, with more or less distinct depres- 

 sions or sulci in the median interradial lines abactinally. Deeper and more conspicuous 

 depressions are present on the actinal surface. Interbrachial arcs angular. 



The plates of the abactinal surface, which are small and narrow, form a clearly defined 

 open network of delicate character. The plates are bevelled into a more or less distinct 

 ridge, upon which are borne, at wide intervals apart, single isolated hemispherical or 

 slightly conoid granules, which are quite invisible without the aid of a magnifying- 

 glass. The meshes are relatively large and are occupied by one or occasionally two 

 papulae. 



On the lateral wall of the ray an indistinct longitudinal series of small plates, which 

 represent a supero-marginal series, may be discerned ; and below these a second and more 

 conspicuous longitudinal series of larger plates, which represent the infero-marginals, is 

 present. These two series are separated on the inner half of the ray by a series 

 of small, vertically disposed, intermediate plates between which are large papulae ; and 

 on the inner half of the ray the infero-marginal series is separated from the adambulacral 

 plates by actinal intermediate plates, of which two or even three series may be present at 

 the base of the ray, but the upper series extends a very short distance, and that next the 

 adambulacral plates extends very little further than half way along the ray. The spinu 

 lation of the plates above described, which intervene between the abactinal and adambu- 

 lacral plates, is remarkable, from the fact that it shows a tendency to form vertical or 

 transverse single lines of papilliform granules. In some examples the vertically disposed 

 series of granules on the infero-marginal plates may be doubled. 



The armature of the adambulacral plates consists of a single transverse series of three 



