68 



I >iam. of valves, o*i8a m.m. 



Area : long diam., o*o66 m.m. ; short diam., 0046 m.m. 



Length of loi s, 0*033 no.m. 



Area oval. Rays about 60, alternate ones reaching area, the 



others only half as long. A smooth circle exists between the 



and termination of the rays, 0-003 wide. No circlet. No 



inter-radial beads. The central rays inclined to be horizontal and 



sub-parallel, those at the ends radiate. 



This diatom seems to be abundant in the marine California 

 deposits. I have seen it from Sta. Monica, San Pedro, San 

 Redondo, and Sta. Barbara. I have a small variety, recent, with 

 only 30 rays, from Apia. Samoa. 



Campylodiscus coronilla, Brum, = C. Doegeanus, Deby. 

 In litt. (PI. XIV.. f. 69, and pi. XIII., f. 66.) 



Group of the Striata?. 



Diam. of valves, 0*132 m.m., but I have it as small as 0*062. 



Area oval ; long axis, 0-056 m.m. ; short axis, 0*041 m.m. 



Length of long rays, 0*043. 



Alternate rays reach the area, the others stop mid-way. 

 Breadth of inter-radials at margin, 0-006 m.m. Number of rays, 

 including both long and short ones, 48. Radiating stria? same 

 number as rays, and continuous with them. A circlet of small, 

 rounded granules rather irregularly scattered. (I have seen a 

 smaller variety, 0T15 in diam., with only 40 rays.) 



Margin with two beads per inter-radial. Length of marginal 

 beads, 0*007 ni.m. The rays radiate from a central line. No 

 central smooth space. 



I have this fossil form from San Redondo and Sta. Monica, 

 and seen it in Mr. Rae's collection, from the Philippine Islands 

 (Challenger). It cannot be confounded with C. Rabenhorsfii, but 

 may be a form of C. Califomicus (Grove), Deby, with a circlet. 



Campylodiscus Hardmanianus. (.rev. in litt. 1866. 

 (PI. XV., f. 78.) 

 Group of the Punctatae. 



