64 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



COCCONEIS PELLUCIDA Grunow 



(Hantzsch, Diat., Ostind., pi. 6, fig. 11; Schmidt, Atlas, pi. 194, fig. 27; pi. 195, 

 fig. 3.) 



Although De Toni notes the similarity between this and C. pseudo- 

 marginata Gregory, his not uniting them is probably right. But he 

 removes from this Grunow's figure in Neue and Ungeniigend Diato- 

 maceen, plate 13, figure 6, and puts it in C. pseudomarginata Gregory 

 (Syl. Alg., pp. 455, 457). 



COCCONEIS PINNATA Gregory 



(Micro. Journ., 1859, p. 79, pi. 6, fig. 1; Schmidt, Atlas, pi. 189, figs. 1-5; 

 pi. 190, fig. 3.) 



De Tonti can not be sustained in placing this under C. brundusiaca 

 Rabenhorst (Rabenhorst, Suss. Diat., pi. 3, fig. 16.) 



COCCONEIS PSEUDOMARGINATA Gregory 



(Gregory, Diat., Clyde, pi. 9, fig. 27; Schmidt, Atlas, pi. 194, figs. 5-7; H. L. 

 Smith, Types, No. 74. ) 



COCCONEIS TRANSVERSA A. Schmidt 



(Schmidt, Atlas, pi. 196, fig. 39.) 



Genus COSCINODISCUS Ehrenberg 



COSCINODISCUS AFRICANUS Janisch 



(Janisch, Gaz. Exp., pi. 3, fig. 2; Schmidt, Atlas, pi. 59, figs. 24-25.) 



COSCINODISCUS APOLL1NIS Ehrenberg 



(Ehrenberg, Mikrogeologie, pi. 35A, sec. 22, fig. 4.) 



There is not much doubt that this and C. scintillans Greville 

 (Quart. Journ. Micro. Soc, 1863, p. 230, pi. 10, fig. 6) are the same 

 (see Rattray, Rev. Cose, p. 578). My specimen agrees fully with 

 that in Schmidt's Nordseefahrt Diatomaceen, plate 3, figure 33, to 

 which Rattray attaches the varietal name, compacta. Greville's 

 type came from the fossil bed at Cambridge, Barbados, and Ehren- 

 berg's from a dredging in the Antarctic, while Grove reports it from 

 the fossil deposit of Oamaru, New Zealand, a rather strikingly wide 

 distribution in time and space. The very similar C. galapagensis Rat- 

 tray, figured as C. griseus Greville, in Van Heurck's Synopsis, plate 128 

 figure 7, and plate 132, figure 1, led me in my Diatoms of the Alba- 

 tross Voyages (p. 252) to place this variety of apollinis with it. 

 Although difficult to separate these two, their union was hardly jus- 

 tified. Rattray is correct in throwing out of this combination "C. 

 scintillans Greville" in H. L. Smith's Types, No. 99. 



