MEMORANDA. ; 63 
anticipated, nearly the whole of the new forms figured by 
me from the Glenshira sand are found living, and generally 
abundant, in these waters. The following list contains the 
names of such of the marie species, figured in my former 
papers, as I have found in the new materials : 
“ Cocconeis distans, Navicula diuyma 6. 
7 costata. 23 crassa. 
RKupodiseus Ralfsii; also var. 6, sparsus. Pinnularia Pandura. 
Campylodiscus simulans. 5 longa. 
Surirella fastuosa, very large. 3 inflexa. 
Amphiprora recta. Amphora Arcus. 
~ lepidoptera. 3 crassa. 
Navicula rhombica. ne elegans. 
be maxima. be plicata. 
i, angulosa, and var. £. f. obtusa. 
x humerosa. * Grevilliana. 
_ latissima. a rectangularis. 
3 clavata. % lineata. 
an splendida. Synedra undulata. 
% incurvata. Tryblionella constricta. 
e didyma, var. y, costate. # apiculata. 
“TY think we can hardly doubt that all the new Glenshira 
marine forms will ultimately be found in the neighbouring 
waters. 
*‘ Before going farther, I have to remark, that two of the 
forms in the first list above given, namely, Campylodiscus 
Horologium and Himantidium Williamsoni, which had only 
been found by Professor Williamson, who detected them 
both in a dredging made by Mr. Barlee on the coast of 
Skye, im which they were very scarce indeed, have occurred 
abundantly, the former in one of the Loch Fine dredgings, 
and sparingly in some of the others, the latter m another of 
them, and, though less abundantly, yet frequent in nearly 
all the Clyde materials. We shall see Himantidium Wil- 
liamsoni, which Professor Smith had referred doubtfully to 
that genus, not having been able to see more than the front 
view of it, is really no Himantidium ; the side view, which is 
very abundant in one of my dredgings, having characters 
quite incompatible with the genus Himantidium. On this 
account, I shall refer to it among the new forms which I 
have to mention. I have found it a matter of very great 
difficulty, if not impossible, to refer it to any of the genera in 
Smith’s ‘Synopsis.’ I may here add, that Synedra undulata, 
which I had recognised in the Glenshira sand, but which 
had never occurred entire in that deposit, is frequent in the 
first material from Lamlash Bay (Professor Allman’s), where 
it occurs quite entire in more than half of those I have seen, 
