268 RADIATA. 
Alcyonium hirsutum.—Common on fuci. 
Alcyonium echinatum.—Common on shells in 
estuaries. 
Alcyonium gelatinosum.—Not uncommon on 
Shells, &c. 
SPONGIADZ. 
* Tethya spherica.—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.—Rare. 
Halichondria hirsuta.—Rare. 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. oot uncommon on ex- 
posed beaches. 
* Halichondria Montagu: —Kingsbridge. (Mon- 
tagu.) Plymouth Sound ? (J. C. B.) 
* Halichondria hispida.—Devon. (Montagu.) 
Halichondria ramosa.—Rare. 
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.—Rarer than compressa. 
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