G. ALCYONIUM. 
251 
In the running and still waters in the environs of 
Paris, particularly at the fountain of Bagnolet. 
COMPACT. 
41. Alcyonium compactum. A globulous and ra- 
ther irregular mass, perhaps detached ; surface sleek ; 
flesh firm and corky in a dry state. 
Var. B. Lower part almost pointed. 
Atlantic Ocean. 
Nota. This last species commences the second 
section of M. Lamarck’s Alcyonias, which are distin- 
guished from the first by the non-apparent oscules of 
the cells on the dry Polypidom ; it includes the Alcyo- 
nium compactum, medullare, paniceum , testudinarium, 
orbiculatum , radiatum , cuspidiferum , granulosum , putri - 
dosum , purpureum, boletus, boletiforme, gelatinosum, and 
bursa . The last of these I have placed among the Tha- 
lassiophy tes, under the name of Spongodium bursa ; 
the Alcyonium gelatinosum evidently belongs to the 
genus ; all the others are doubtful, and perhaps form 
an intermediate group between the Alcyonias and 
the Spongias. 
MARROW OF THE SEA. 
42. Alcyonium medullare. 
43. Alcyonium paniceum. See the description of 
Spongia panicea, (p. 157). 
TORTOISE. 
44. Alcyonium testudinarium. Elliptical patches, 
a little convex above, and concave below, friable, and 
reticulated ; the upper surface garnished with a coat- 
