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CLASS IV. 
SEA-QUINCE. 
5. Alcyonium cydonium. Mass oval or elliptic, 
convex above, and flattened below ; laciniated or irre- 
gularly creviced ; little cells apparent when the exte- 
rior has not been rubbed off. 
Seas of the North, of Africa and of India* 
LUMPY. 
6. Alcyonium massci* Shapeless, fawn-coloured, 
spongy, and spread out ; little cells with five rays ; 
centre black. 
Sea of Norway. 
TURBAN. 
7. Alcyonium cidaris. Of a nearly round form ; 
surface firm, hard, cellular, undulated, and sometimes 
osculated. 
Mediterranean. 
HIVE-FORMED. 
8. Alcyonium vesparium. A large, upright mass, 
of an oblong oval sh ape, slightly pyramidal, obtuse 
or truncated at the summit ; from five to eight deci- 
metres in height. 
Seas of India. 
INCRUSTING. 
9. Alcyonium incrustans. Masses incrusting, 
obtuse, proliferous, or lobed, and very white; pores 
numerous, close together, and somewhat in the form of 
a star. 
On the fucus of the European seas. 
climbing. 
10. Alcyonium serpens . Fleshy and whitish 
