168 T. T. CLEVE ON SOME FOSSIL MARINE DIATOMS. 



C. obsoletus, Ch., n.sp. Valve orbicular or oval, diameter *17 

 mm., central area large, surrounded by a circle of short puncta. 

 Limbus, with a few irregular and obliterated canaliculi. Margin 

 with short cellules. Of all the described forms of Campylodisci with 

 which I am acquainted, this shows the nearest affinity to G. 

 tabulates, A. Schm. Atl., PI. 52, f. 4, but the canaliculi in 

 that species extend from the margin to the circle of puncta sur- 

 rounding the central margin. PL 12, f. 2, ^ , b. c, margin in 

 different foci ^. 



Synedre^e. 

 Synedra fulgens (Kiitz). W. Sm. Gomplienema, Kiitz (1833). 

 S.fu1gens,W. Sm., 1853. Van. Heurck Syn., PI. 43, f. 1-4. 

 I have only seen a fragment of a valve "02 mm. broad, with un- 

 usually coarse strise, 6 in *01 mm. 



ENTOPYLE2E. 



Gephyrea media, Arnott, M.J.S. viii.,p. 20 (1860). Achianthes 

 angvstata, Johnst. (nee. Grev.), M.J.S. viii., p. 14, PI. 1, f. 13 

 (1860.) Costa3 6*5 in -01 mm. The species found in the " Tegel " 

 are identical with those from the Moron deposit. It occurs living 

 in California, Japan, &c. 



Striatellejs. 



Rhabdonema adriaticum, Kiitz. One specimen. 



Grammatophora maxima, Grim. Verb., p. 416, PI. 5, f. 5 

 (1862). A large and robust form, -18-*3 mm. in length and *018 

 in breadth. No striation could be detected. 



Isthmie.e. 

 Isthmia nervosa, Kiitz. No difference between this specimen 

 and the recent form could be detected. 



BlDDULPHIE^E. 



Biddulplua pulclxella , Gray. (1821). The Tegel specimens are 

 identical with the recent forms. 



B. Tuomeyi (Bail.), Roper. Zygoceros Tuomcyi, Bailey (1843). 



B. Tuomeyi, Roper (1859). Van Heurck Syn., PI. 98, f. 2-3. 

 This is a very variable species ; some specimens so nearly resemble 

 B. elegantula, Grev., T.M.S. xiii., PI. 6, f. 13, that they might be 

 taken for that species, whilst others can scarcely be distinguished 

 from B. regina, W. Sm. Syn., Vol. ii., p. 50, PI. 76, f. 323. Van 

 Heurck Syn., PI. 98 f. 1. 



