large size of its nearly empty cells, in the centre of which a small 
spherical grain of emerald-green endochrome is found. ‘The 
ramuli are so slender that they consist of a single row of such 
cells, and thus have something the character of the threads of a 
Conferva. . 
My first knowledge of this species was from specimens dredged 
in 1838 by Mrs. Griffiths in Torbay. They remained m my 
Herbarium unnamed until the plant was again found, im 1845, 
by the late Mr. M‘Calla, who bestowed the name as a tribute of 
grateful respect to Mr. Thomas Hopkirk, author of ‘“ Flora Glot- 
tiana,” from whom he had received kindness whilst resident in 
the neighbourhood of Belfast. In now adopting Mr. M‘Calla’s 
specific name I wish to record the regret I feel, in common with 
all naturalists acquaimted with his merits, that death should so 
soon have closed a career which opened with much promise of 
future fame. ‘The readers of the Phycologia must be well ac- 
quainted with the name of Mr. William M‘Calla, in connection 
with the habitats of many of our rarest Alge. It is therefore 
almost superfluous to say that he was well acquaimted with the 
species, and had a most acute eye to detect a minute species, and 
a most accurate judgment to discriminate one varying form from 
another. But though Algze were the natural objects in which, 
of late, he chiefly delighted, he had a very extensive knowledge 
of marine zoology, and has made large additions to the Irish 
Faunee. Born in very humble circumstances, imperfectly educated, 
and always with narrow means, he had to struggle through life 
with many hindrances to progress. ‘That he overcame many of 
those hindrances is a proof of his talents and energy; that he 
did not overcome all may well be forgotten by those who have 
not had to struggle with any, and yet feel disposed to criticise 
the short-comings of others. Mr. M‘Calla fell a victim to Cholera, 
in May 1849, aged about 35. 
Kig. 1. ENreromMorPHA Hopkrrkit:—of the natural size. 2. Portion of a 
branch :—magnified. 3. Small fragment of the same, with its subulati 
ramuli :—very highly magnified. 
