SOME NEW AND HARK DIATOMS. 



A very interesting species of this noted Genus; its enormous size, which is quite uniform 

 in several individuals, and the coarse striation at once place this as a different species from any 

 yet observed : the ends of the median line have a slight elongation ; there is also visible in the 



median line the distinct rudiment of a central nodule; the figure in our plate lacks these points, 

 but otherwise is reliable. 



Aiilacoditcii* kiiikcriainiv X. Sp., E. S. Xott. Disc large, .009 inch in diameter; 

 lurid; 5 to 7 rounded marginal processes; furrows conspicuous, extending but half way to the 

 centre: umbilicus smooth and circular; granules minute, arranged in masses, which are radiant 



on the outer half of the valve, but irregularly disposed on remainder. Plate 1. Fig. 9. Habitat. 

 Moravian Earth : Mr. Edw. S. Xott. 



.One of the most striking members of a Genus full of curious and instructive forms ; the 

 valve, when the under surface is in focus, bearing a remarkable resemblance to Eupodiscus Argus, 

 and when the other surface is in focus having an entirely different appearance. Mr. Xott fur- 

 nished us with samples of this species early in the spring of 1S85. and has requested us to call it 

 after his friend. Mr. Kinker. of Amsterdam, who furnished him with the material, which is a fossil 

 deposit from Eastern Austria 



\iilnco<li*i'ii* ^rmidi*. X. Sp.. YV. C. Walker. Disc pale, distinctly bullate beneath 



the 5 to 7 very prominent submarginal processes : granules small, distinct, arranged in radiant 

 rows over entire surface of valve: furrows distinct, and placed on elevated ridges extending to 

 centre of disc: umbilicus smooth and irregular: margin coarsely striated. Width, .0103 inch. 

 Plate 1. Fig. 8. Habitat. Cambridge Kstate. Barbadoes ; W. C. Walker. 



This beautiful species possesses several interesting points : the central part of the valve is ele- 

 vated to an equal degree with the furrows, and when in focus the remainder is so far without as 

 to cause the whole to present the appearance of a live-rayed star : the very close arrangement of 

 the beautiful pearly granules, and its huge size, all combine to make this one of the finest of its 

 kind. 



Aiilacodiscus Stoschii, Janisch. Disc clear, with 6 or S minute, submarginal pro- 

 . situated on prominent thimble-shaped elevations: central half of disc elevated : granules 

 arranged in radiant lines on the entire surface: rounded and distant on elevated portion of valve. 

 but compressed and irregular in outline on remainder of surface: umbilicus circular and irregu- 

 larly granular : margin finely striated: width .0088 inch. Gazelle Expedition, C. Janisch ; Cam- 

 bridge Kstate. Barbadoes. W. C. Walker. Plate 1. Pig. 2. 



This species o( a genus that has furnished the Diatomist with so many beautiful forms, is 

 figured by Ilerr Janisch in Fig. 11, Plate 34. of Schmidt's Atlas. It presents several distinctive- 

 characteristics : the thimble-shaped elevations: the deeply-depressed spaces between the pn 



