33 



C. singularis. A. S. At]., pi. 14, f. 29, = C. crebrecostatus, 

 ( irev. 



C. socialis. O. Witt., A. S. Atl., pi. 14, f. 7—9. 



C. Sonderianus. Grun., in litt., Moller slides, = C. Hard- 

 manianus, Grew, in litt., 1866. 



C. speculum. Leud., Ceylon, pi. 4, f. 49, = C. signatus, Leud., 

 = C. radians, Leud., C. latus, Shadb. vars. 



C. spiralis. W. Sm., pi. 7, f. 54, = Surirella spiralis. 



C. stellatus. Grev., M. J., 1859, pi. 7, f. 3. 



C. Stellula. Schum. Preus., Diat., pi. 3, f. 6, = C. dypeus, Ehr. 



C. Striatus. Ehr., Amer., pi. 3, 7, f. 13; Bright, M. J., Vol. 

 VII., pi. 9, f. 4, = ? C. undulatus, Grev. 



C. Striolatus. Grun., A. S. Atl. (1885), pi. 53, f. 1, 2, = C. 

 Kutzingii., Harv. and Bail. (1862 — 1874), pi. 

 9, f. 20. 



C. Studeri. Jan. Gazel., pi. 19, f. 9 — 10, = C. Greenleafianus, 

 Grun., = C. erosus, Castr., = C. undulatus, 

 Grev. var. 



C. subangularis. Cleve and Moll., Diat., Nos. 154, 155, 

 Nomina nuda. My slides only contain C. simu- 

 lans and C. circumactns, from the Balearic Islands 



C. Sumatrensis. Leud., in litt. 



C. suberbus. Rabn., Flor. Europ. Alg., p. 45, pi. 8, f. 8 ; Suss- 

 wasser, Diat., pi. 3, = Calodiscus superbus. 

 Possibly not a Campylodiscus, as it is described 

 as flat and immersed in mucus. This form, 

 from " paludosus subtnarinis terra di Otranto 

 Italice Australis" should be looked for by 

 Italian diatomists, as it is a puzzle to algologists. 



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