110 JOURNAL OF THE [July, 



FIVE SPECIES OF TRICERATIUM. 



BY E. A. SCHULTZE. 

 Plates IV. and V. 



The slides from which the five species of Triceratium, figured 

 on Plates IV. and V., were taken, are the work of Prof. Thum, 

 in Leipzig, and the frustules are selections from the Barbadoes 

 material. 



I am indebted to my friend H. L. Brevoort, for his kind 

 assistance in the preparation of tliese plates, his camera having 

 furnished the negatives, which were taken with a Wales iV-inch, 

 and a Spencer iV-inch objective, respectively, and which show a 

 magnification of about 650 diameters. So far, I am only able to 

 identify one of the five sj^ecies ; viz., (II.) " Entogonia margi- 

 nala,'" of which Ila. represents the same diatom taken under a 

 different focus. This specimen will be found figured in A. 

 Schmidt's Atlas, Plate 88, No. 6. The other four have been 

 sent to A. Schmidt for identificati )n, the result of which I shall 

 communicate to the Society as soon as I hear from him. No. 

 III. is, I believe, a new species. I can find no specimen among 

 the 125 at my command with which it might be classed as a va- 

 riety, on account of the peculiar markings. The interior net- 

 work is an embossed and sharp structure, interwoven here and 

 there with lines of exceeding fineness. No. IV. is, I think, a 

 variety of Triccratiuin venosum, figured in Schmidt's Atlas, 

 Plate 88, No. 12 ; while V. (Va. a different focus) appears to 

 be a variety of " Triceratiuin caelatum" Schmidt's Atlas, plate 81, 

 No, 19. 



