

the rays. Inter radials quite smooth. R tys 2 \ in number. Outer 

 mi valves finely - One large marginal hyaline 



hc.nl to 1 ach pair ol rays. 



roblance to this spe< ies, belongs 

 to the group pf Hyalinae, and lias a reniform area. 



C. chrysanthemum is from the Yedo limestone, and according 

 to M. Brun from Nossi Be*. 



5. Campylodiscus clivosus, J. Brun. 



Brun. et Pemp., Diat Foss. Japan., p. 28, pi. II., f. 11 a, b. . 



Brun. ( 'oil.. No. 2532. 

 Group oi the Punctata?. 



Dimensions of large specimen .•— 

 Diam. of valves, 0*103 m - m - 

 Diam. of area. 0-070 m.m. 

 Length of rays, o - ot3 m.m. 



Width of inter-radials varying, but average is 0-006 m.m. I 

 have seen small specimens only 0050 in diameter of frustule. 

 Valves circular. Area circular, with a slight angle or notch top 

 and bottom. Rays simple, originating at the margin in a small 

 triangular notch. No marginal, inter-radial heads. Inter-radials 

 finely, longitudinally striate. From 5 to 10 striae to each inter- 

 radial. Area very finely punctate, with a clepsydrate figure. At a 

 certain focus of the microscope the whole surface of the valve 

 shows an exquisitely fine and close very characteristic radial 

 striation. 



This diatom has no relation to C. Gran/andicus, CI., nor to 

 ('.. Hybemicus, Ehr. It is more nearly intermediate between C. 

 GrcenlandicuS) CI., and C. simplex, Brun. 



I issil from Vedo, Japan, and, according to Brun, from the 

 mouth of the Oregon, U.S.A 



6.— Campylodiscus coronilla, J. Brun. 



Diat. Bspeces Nouv., p. 14, pi. XXL, f. 3. 



Deby, Analysis, pi. XIV., f. 69 ; and pi. XIII., f. 66. 



