6/ 



Valves perfectly circular. Rays short, rather indistinct, tooth 

 like, 0*033 l° n g- 



Two short marginal, bifid beads, with a granular surface to 

 each inter-radial; length of these beads, 0*013. There exists, 

 besides these large beads, a row of minute granules along the 

 margin. Area smooth. 



Philippine Islands. From Mr. Rae's collection. 



Campylodiscus marg-osinuatus. Deby. 



Group of the Hyalinae, with rays reduced to teeth or spikes. 



Diam. of valves, 0*146 m.m. 



Area : length, 0*113 m.m., breadth the same. 



Length of rays, 0*016 m.m. 



The rays consist in short, straight teeth, rounded at their ends. 

 They are separated by inter-radials of the same shape, but reversed, 

 so that the internal margin of the valve appears regularly scalloped, 

 or rather like a cog-wheel. The area is smooth. A circlet 

 of minute dots at some distance from Rays. No inter-radial beads. 

 No appearance of striae on the area. Rays with a line of beads. 



From Challenger trawl in lat. 140 , 33 s , long. 34 , 37', in 117 

 fathoms. From Mr. Rae's collection. 



Campylodiscus Balticus. Cleve. In litt. 



Group of the Hyalinae. 



Diam. of valve, which is circular, 0*077 m.m. 



Diam. of area, 0*048 m.m. 



Length of rays, 0*008 m.m. 



Breadth of inter-radials, 0*009 m.m. 



Rays 30 in number. 



No circlet. No inter-radial beads. Striae very fine, delicately 

 and longitudinally punctate. 



Striae, 12 in o*oi m.m. 



This species was lately discovered in the Baltic Sea by M. 

 Cleve, in 3 fathoms, off Killvilken. 



Campylodiscus Californicus (Grove). Deby. PL XIV., f. 70). 

 Group of the Striatae. 



