MARINE SPONGES. 
9 
2°.—Specimens collected by tlie dredge on board the 
“ Aerolite” steam-launch in 15-20 fths. in 1883. 
These have been treated precisely in the same way as the 
dredgings on board the “ Curlew” above mentioned, and the 
species tied up separately in bits of muslin, numbered as 
follows:— 
1. —Hymeniacidon carnosa, Bk. 
2. — Halichondria Pattersoni, Bk. 
8. —Hymeniacidon suberea, Bk. 
4. — Halichondria panicea, Bk. 
5. — Isodictya fucorum, Bk. 
Calcareous Sponges. 
G.— Grantia compressa, Bk., (Op. cit., vol. iii., pi. 1), and 
Grantia ciliata, Bk., (Ib., pi. 2,) growing together on small 
Fuci. 
7. — Lencosolenia botryoides, Bk., (Ib., pi. 3.) 
8. — Lencosolenia contorta , Bk., (Ib., pi. 3.) 
9. — Debris, contents similar to those above mentioned. 
Observations.— Although there is no specimen of Micro- 
ciona here, all the rest of the species obtained in the dredging 
of 1881 appear in that of 1883, so that the “observations” 
already made on them are equally applicable to those of 1881. 
But, in addition to these species, all of which are provided 
with siliceous spicules, there are several others here whose 
spicules, minerally, are compossed of carbonate of lime, i.e., 
the so-called “ Calcareous Sponges,” of which it might be 
observed that:— 
Grantia compressa may be known by its compressed form, 
smooth surface and unfringed or naked mouth, growing 
together on small Fuci here, with Grantia ciliata, from which 
again it may be distinguished by the rough surface and 
fringed mouth of the latter. 
Lencosolenia botryoides, a branching little sponge, requiring 
the aid of a two-inch focus lens to be well seen; growing in 
small patches, with the ends of the branches terminating in 
a little sacciform head respectively; on small Fuci. 
Lencosolenia contorta — Clathrina, Gray = Ascetta, Haeckel; 
is represented by one specimen only. It grows abundantly on 
the rocks between tides, at this place, and an account of it 
may be found in the Ann. Mag. Nat. History for 1884, 
vol. xiv., p. 17, under its original name of Sponyia coriacea, 
Montagu. 
In short, all four species, with many others, may 
often be found growing together on the same Fucus or piece 
of rock. 
