136 CRY'PTONEMIACE^. 



XI. Halymenia. Frond compressed or flat, gelatinoso- 

 membranaceous, the membranous surfaces separated 

 by a few slender, anastomosing filaments. Masses of 

 spores attached to the inner face of the membranous 

 wall. [Plate 19, D.] 



XII. GiNANNiA. Frond cylindrical, dichotomons, tra- 

 versed by a fibrous axis ; the walls membranaceous. 

 Masses of spores attached to the inner face of the 

 membranous wall. [Plate 19, C] 



XIII. Kallymenia. Frond expanded, leaf-like, fleshy- 

 membranous, solid, of dense structure. Favellidia 

 like pimples, half immersed in the frond, and scat- 

 tered over its surface. [Plate 19, B.] 



XIV. Irid^a. Frond expanded, leaf-like, thick, carnoso- 

 coriaceous, solid, of dense structure. Favellidia 

 wholly immersed, densely crowded. [Plate 19, A.] 



XV. Catenella. Frond filiform, branched, constricted 

 at intervals into oblong articulations ; the tube filled 

 with lax filaments. [Plate 20, B.] 



Sub-order 4. GLOiocLADiEiE. Frond loosely -gelatinous ; 

 the filaments of which it is composed lying apart from one 

 another, surrounded by a copious gelatine. Favellidia 

 immersed among the filaments of the periphery. 



XVI. Cruoria. i^/-o/?c?crustaceous, skin-like. [Plate 20, C] 



XVII. Naccaria. i^ro??f/ filiform, solid, cellular ; the ra- 

 muli only composed of radiating, free filaments. 

 [Plate 20, D.] 



XVIII. Gloiosiphonia. i^/-o«tZ tubular, hollow; the walls 

 of the tube composed of radiating filaments. [Plate 



21, A.] 



XIX. Nemaleon. Frond filiform, solid, elastic, filament- 

 ous ; the axis composed of closely packed filaments ; 

 the periphery of moniliform, free filaments. [Plate 

 21, B.] 



XX. Dudresnaia. Frond filiform, solid, gelatinous, fila- 

 mentous; the axis composed of a network of anasto- 

 mosing filaments; the periphery of moniliform, free 

 filaments. [Plate 21, C] 



XXI. Crouania. Frond filiform, consisting of a joiuted 

 filament, whorled at the joints with minute, mullifid, 

 gelatinous ramelli. [Plate 21, D.] 



