P. T. CLEVE ON SOME FOSSIL MARINE DIATOMS. 167 



Schm. Atl., PI. 13, f. 36-38 (1875). I have seen only one speci- 

 men ; it is *13 mm. in length and '42 in breadth. It has only a 

 slight central constriction, as in figure 38 of the Atlas. The stria? 

 are 4*5 in -01 mm. 



JV. gemmatula, Grnn. A. Schm. Atl., PI. 13, f. 20-21 

 (1875). A somewhat corroded valve (PL 12, f. 1); measures *18 

 mm. in length and *048 in breadth, and has 4*5 stria? in -01 mm. 

 It resembles the last-named form, but is larger, It also re- 

 sembles JV.mcesta, A. Schm. Atl., PL 69, f. 18-19, which, however, 

 has closer stria? (7 in # 01 mm.). Nearly related to our specimen 

 is JV. Lesinensis, Grun., m.s., measuring *144 mm. in length and 

 •05 in breadth, with 5 stria? in *01 mm., but the depressions 

 parallel to the median line are narrower. 



JV. Beyrichiana. A. Schm. Atl., PL 69, f. 16-17 (1881). 

 One specimen, which measures '18 mm. in length and '05 in 

 breadth, and has 33 rows of distant puncta in *01 mm. This 

 species has been found in zEgena (? fossil). 



JV. Crabo (Ehr.), Kiitz. Diploneis Crabo, Ehr. Mb. (1844). 

 JV. Crabo, Kiitz., Sp. AL, p. 83 (1819). JV. Pandura, Bieb. Diat, 

 Cherb., PL 18, f. 4 (1854). I have seen four valves from the 

 " Tegel," all of which have lost their finely-sculptured layer. All 

 of them agree very well with Figures 4 and 8 (pi. 69) in the 

 Atlas ; Figure 8 seems to be more nearly related to JV. multicostata, 

 if this is reallv distinct from JV. Crabo. 



SuiURELLE^E. 



Surirella opulenta. Grun. Verb., p. 461, PL 11, f. 10 (1862). 



S. fastuosa, var. opulenta. A. Schm. Atl., PL 20, f. 1. One 

 large specimen. 



S. Baldjikii. Norman, T.M.S., ix., p. 6, PL 2, f. 2. A. 

 Schm. Atl., PL 20, f. 7. One specimen. This species is still 

 living in the Mediterranean and Black Seas. 



Campylodiscus hibernicus, Ehr. A. Schm. Atl., PL 55, F. 10- 

 11. I have seen one perfect specimen from the "Tegel." Mr. 

 Thum informs me that this well-known freshwater species really 

 occurs in this deposit. This seems highly improbable, as all the 

 other species found in it are purely marine. 



C. Clypeus, Ehr. Ehr. Mb., p. 205 (1840). Cocconeis 

 Clypeus, Ehr. (1838). I have seen one small specimen closely 

 agreeing with figure 3, PL 55, in Schm., Atl. 



