150 NOTES ON RANGE IN DEPTH OF MARINE ALGÆ. 
kaliformis, Melobesia calcarea, Rhodymenia cristata, Phyllophora rubens, 
rodiei, Peyssonelia Dubyi, and species of Delesseria. Seve 
iie are also found in the littoral zone. 
. It is of interest, however, to ascertain the absolute limit of vegetable 
life on our own shores, and the only case which has come under my 
own notice is the following :—About ten years ago, in company with 
the late Mr. Hyndman, of Belfast, and Mr. Waller, when dredging 
near the Maiden Rocks, coast of Antrim, our dredge got fast on rocky 
bottom at a depth of about S0 fathoms. With some difficulty we re- 
covered it. On examination it contained a few mollusca, abundance 
of living zoophytes,* and two red Alga, the largest being Phyllophora 
Brodiai, quite fresh and of the usual colour. It appeared to have 
been recently torn from its site; still, as it is not unfrequently cast 
upon the Antrim coast, it is just possible that the specimen may have 
been loose and accidentally entangled in the dredge. Regarding the 
other species, I have no doubt it was attached near the base of one of 
the living zoophytes; and, although not more than a quarter of an 
inch in length, it could be referred to Delesseria sinuosa, a species very 
widely distributed along the British and Irish shores. 
In vol. ii. page 464 of the ‘ Antarctic Flora, Dr. J. D. Hooker 
states that “ 8 to 10 fathoms are the utmost depth at which, judging 
by our experience, submerged seaweed vegetates in the South Tempe- 
rate and Antarctic Ocean." This may be the general limit, but Macro- 
cystis pyrifera is reported, in the same work, as attached to the bottom 
in 40 fathoms, though most of the very long stem—700 feet—lies near 
the surface. Lamouroux speaks of the d/ge@ growing at 100 or 200 
pices. pal m brings. is more than doubtful. Humboldt records 
us folia, Lamx. ; Chauvinia tais Kützing), 
as growing in 30 ihoni i quite green. In ‘ eis Americana,’ 
Anadyomene stellata is stated to grow in 20 fathoms, pe of the usual 
green colour, in the Gulf of Mexico. In his report on the /Egean Sea, 
the late Professor E. Forbes states that Constantinea reniformis, P. and 
R., occurs at 50 fathoms, and he considered this as the greatest depth, 
accurately observed, at which 44/ge vegetate. In a recent number of 
* It may be Vi mua. to — the species :—Sertularia abietina, S. rugosa. 
S. argentea, - rosace keen indivisa, T. Larynx, Tub ws ipora serpens, 
Halecium Bea Flus alari. Crisia eburnea, La and 
Caryophy wy llia Smithi. The fattat lived i in an aquarium for id as years 
