9i 



Valves circular. Area quadrate. A circlet of small, distinct 

 dots. Rays simple, Inter-r idials moniliformly punctate. Mar 

 ginal heads elliptical, coarsely punctate, one to each pair of rays. 

 Alternate rays often shortened. Marginal beads and rays about 

 too. A narrow (0-003 na.m. wide), smooth space between the 

 circlet and the origin of the striae. Striae distinct, radiating from 

 a central point, obsoletely punctate, half as numerous as rays. 



This form differs very materially from C. ornatus, Grev., of 

 which M. Brun considers it a variety, both in the markings of the 

 area and in the punctuation of the inter-radials. It is also very 

 distinct from C. Rabenhorstii. A. S. 



Fossil from Sendai, Japan. 



3.— Campylodiscus canalisatus, Temp, et Brun. 



Diat. Foss. du Japan., p. 28, pi. II., f. 5 : Brun. Collect., 

 Slide, Xo. 2S64. 



The characters which are supposed to distinguish this species 

 are too slight to be of any specific value. It is barely a variety of 

 C. vitricavus, from the same locality. 



4.— Campylodiscus chrysanthemum, J. Brun. 



Diat. Foss. du Japan., pi. II., f. 7. Brun. Coll., No. 2663. 

 Group of the Punctata?. 



Dimensions : — 



Diam. of valve, 0-083 m.m. 



Long diam. of area, 0-033 no.m. 



Small diam. of area, 00 19 m.m. 



Length of rays, 0-022 m.m. 



Length of funnel, 0-013 na.m. 



Length of stem, 0-009 m.m. 



Diam. of marginal beads, 0*006 m.m. 



Valve circular. Area small, oval. Rays intundibuliform, with 

 linear, non-punctate, non-striate funnels. Stems shorter than 

 funnels. Area carrying a few sparse dots or apiculi. A very 

 narrow, concentric, smooth zone follows the inner termination of 



