268 
RADI AT A. 
Alcyonium hirsutum.—Common on fuci. 
Alcyonium echinatum.—Common on shells in 
estuaries. 
Alcyonium gelatinosum.-Not uncommon on 
shells, &c. 
SPONGIADiE. 
* Tethya sphaerica_Coast of Devon (Montagu.) 
Bovisand. (J. C. B.) 
Halichondria papillaris.- Crumb of bread 
sponge. Common at various depths. 
? Halichondria panicea.—Encrusting rocks at 
low water, Bovisand. 
Halichondria parasitica.—Bare. 
Halichondria hirsuta.—Bare. Mount Batten. 
* Halichondria suberica_Common. Encrusting 
dead univalves, especially Nasa reticulata, and 
these shells being themselves the habitations of the 
Hermit crab at the same time. I have found it also 
enveloping stems of sea-weed. 
Halichondria fruticosa.—On stones from deep 
water, Plymouth Sound. 
Halichondria coalita.—Not uncommon on ex¬ 
posed beaches. 
* Halichondria Montagui.—Kingsbridge. (Mon¬ 
tagu.) Plymouth Sound ? (J. C. B.) 
* Halichondria liispida.—Devon. (Montagu.) 
Halichondria ramosa.—Bare. 
Halichondria palmata.—Deep water. 
Halichondria ventilabra_Bovisand. (Miss Hook) 
Halichondria plumosa.—Common on oysters, 
stones, &c. at various depths. 
I have in hand a number of yet undetermined, or undescribed 
species of this genus. 
Spongia pulchella.—A specimen from the beach 
under the Hoe. 
Grantia compressa_Deep water, not uncommon. 
Grantia botryoides.—Barer than comprgssa. 
