86 
Greville, on New Diatoms. 
Hah. Barbadoes deposit, Cambridge estate; C. Johnson,, 
Esq. ; R. K. G. 
The only species with which the present diatom can be 
compared is E. amabilis [' Mic. Journ./ vol. Ill, N. S., PI. X, 
fig. 21) ; but the structure of the border in the latter is very 
different, being composed of distant transverse rows of minute, 
distinct, and somewhat remote pore-like cellules. In the 
species under consideration, on the contrary, it is a uniform 
and continuous network of hexagonal cellules. In both, the 
pseudo-nodules are unusually developed, especially in E. reti- 
culata, where they are so long as to make the valve, when 
seen obliquely, look like a low three-legged footstool. As in 
the other species of this genus, the costse of the border are 
extremely variable in number. I have seen as many as nine 
on one side, without reckoning the short ones connected with 
the angles. The distance between the angles is about -0035^'. 
