79 
Descriptions of New Srecizs of British Diatomacra, chiefly 
observed by the late Professor Grecory. By Roserr 
Kaye Grevitie, LL.D., F.R.S.E., &c. 
Towarps the close of the year 1857, my lamented friend, 
the late Professor Gregory, was engaged in the examina- 
tion of some Diatomaceous gatherings, the results of va- 
rious dredgings made by Professor Balfour in Lamlash 
Bay. He had detected a considerable number of forms 
which he believed to be undescribed; and with reference to 
their publication I had completed drawings of a portion of 
the series, when he was attacked by his last illness. It does 
not appear that he had reduced any of his observations on 
these new species to writing; at least, I have not been able 
to find a single memorandum onthe subject. So that, how- 
ever desirous I may be to secure to the name of my late 
friend the credit due to his discoveries, I fear that, even 
with the aid of his collection, which has been most kindly 
presented to me by his widow, I shall perform this duty 
very imperfectly. It unfortunately happens that, in some 
cases, the slides which contained the objects to be drawn 
were returned to him for description, and I have neither 
been able to find the original slides (in the absence of any 
distinctive mark or label), nor additional examples of the 
forms in question. The present communication consequently 
does not contain a notice even of all the species of which I 
had made drawings. The wonderful memory possessed by 
Professor Gregory rendered him independent of temporary 
notes. The careful study he bestowed upon the forms which 
came under his eye, fixed every character, however minute, 
in his mind, and it was not until he had completed his 
investigations that he sat down to record them. By his 
death Science has lost a most successful explorer, as well 
as one of the most patient and indefatigable of microscopic 
observers. 
1. Cocconeis pinnata, Greg. MSS. 
Valve oval; striz concentric with the extremities, robust, 
moniliform, distant, not reaching the median line, but leaving 
a narrow-elliptical blank space; length ‘0014; strize 11 in 
O01" (Pl. VI, figs hh) 
Marine. Lamlash Bay, in the Island of Arran. Dredged 
by Professor Balfour in 1857. 
Among the new forms detected by Professor Gregory in 
VOL. VII. I 
