4 6 4 



BELLEROCHEA. 



StreptOtheca Tamesis Cleve (in Shrubsole "On a new 



Diatom in the Estuary of the Thames," J.Q.M.C., 1890, iv., n.s., p. 259, 

 pi. 13, f. 4-6). 



Marine. In the Thames at Sheerness-on-Sea (Shrubs. !). 



This curious form, of which, in consequence of its fragileness and 

 transparence, no durable preparation has hitherto been made, must be 

 accepted as a diatom with caution, as the arrangement of the endochrome 

 alone enables us to rank it with diatoms. Further study should be able to 

 determine the question. 



GENUS 130. BELLEROCHEA. H. VAN HEURCK, 1885. 



Fig. 195. 

 Bellerochea Malleus. 



Frustules scarcely silicious, united into a 

 long narrow filament, leaving elliptical open- 

 ings between one another. Valve triangular 

 or quadrangular,with margins unequal, deeply 

 excavated, undulate and apices slightly raised 

 into a not very robust process. 



B. Malleus (Brightwell) H. Van Heurck. (Tr-ceratium 



Malleus Brightw. ; Q.J. M.S., 1858, vi., p. 154 : H.V.H. At]., pi. 114, f. 1*). 



Characteristics of genus. Length of valves from one angle to another, 

 10 c.dm. 



Marine. Very rare? Scheldt at Antwerp (Belleroche !) Eastern and Western Scheldt 

 (H.V.H.) England, stomachs of Noctilucce (Brightwell, Kitton). Thames. 



This species encloses a greenish endochrome ; the valves appear quite 

 smooth ; all kinds of illumination have failed to discover any detail 

 whatsoever. This form is closely allied to Eucampia. I ventured to form 

 this as the type of a new genus which I dedicated to the memory of my 

 former excellent friend the late Professor John Belleroche, an enthusiastic 

 diatomphile, who found the only recorded Belgian specimen which has been 

 in my possession for a long time. The species therefore appeared to be very 

 rare up to June, 1893, when I found specimens which had suddenly developed 

 in a gathering from the Thames. Some weeks afterwards I found some rather 

 numerous examples in one of my pelagic gatherings from near Hansweert 



