IS 



C. anceps. Castr. ChalL, pi C. timi/is, Jan, GazeL* 



C. angularis. Greg. Clyde, f. 53 ; Km. and R. Honduras, pi. i, 

 f. 10; A. S, Atl., pi. 18, f. 7- = C. hypodromuSy 

 Bran. 



C. Arabica. Gran., A. s. Atl., pi. 55, f. 7, = C. bicostatus, 

 Rop. var., ? 



C. arachnoides. Halting. Banda Sec pi 2, f. 38, - Auliscus 



compost t us, A. S. 



C. areolatus. Hart. Bod o. Amsterdam, = Doubtful form; 

 not a Campy lodiscus. 



C. argUS. Bail., Micr. Obs., f. 24, 25 (1854), = C. cchcncis. Khr. 

 (1840). 



C. Australis. Grun., A. S. Atl., pi. 51, f. 9, = C. Crcbrcstrosta- 

 tus var. 



C. Aralensis. Khr. Abh., 1872, pi. 12, f. 16. Not determinable. 



C. Atlanticus. Peragal. in T. et. P Diat Exicat., No. 11, 

 Nomina nuda. In this slide I have found C. 

 ornalus, C. biangulatus, C. Damelianus, C. 

 adontatus, C. conti\ r uus. and ( \ Samoensis ; but 

 no form I can refer to as a new species repre- 

 senting C. Atlanticus. 



B. 



Campylodiscus Baldjickianus. Gran., A. S. Atl., pi. 51.' 

 f. 16 — 21, = C. Thuretii. 



C. Balearicus. Cleve, A. S. Atl., pi. 53, f . 1 1 ; pi. 18, f. u, 



= ? C. undulatus, Grev. 



* Belongs very doubtfully to Campylodiscus, as the valves seem not to be 

 concavo-convex and have no apparent marginal wings. 



