25 



f 



S. multipartita, Ag. ; New York Bay. 

 S. augustissima, Ag. ; New York Bay. 

 S. Torreyii, Ag. ; New York Bay. 



III. Gracilaria. Grev. 



i 



Frond slender, filiform, irregularly branched, central cells very 

 large ; cartilaginous Tubercle, fruit with thick pericarp. Tetras- 

 pores imbedded in the surface cells. 



G. multipartita, Clem. ; New York Bay. 



G. dura, Ag. ; Key West. 



G. Helmintochorton, J. Ag. ; Key West. 



3 Sp. ? or new. 



IV. Hypnea. Lamour. 



Frond filiform, irregularly branched, cartilaginous. Tubercles 

 spherical, sessile, or embedded in the ramuli. Tetraspores em- 

 bedded in the surface. 



H. purpurascens, Hudson ; New York Bay. 



H. purpurea ; Mass. Bay. 



H. Wurdemannia, Key West. 



H. musciformis, Lamour ; Key West. 



H. robusta ; Key West. 



3 Sp. ? or new. 



Order VI.— CRYPTONEMIACE.E. 



Frond filiform, rarely expanded, gelatinous. Axis formed of 

 horizontal radiating filaments. Conceptacles globose. Spores in 

 swellings of the branches. Contains 13 genera. 



I. Gelidium. Lamour. — Name, gelatine. 

 II. Gigartina. Lamour. — Name, grapestone. 



III. Gymnogondrus. Lamour. — Name, naked wort. 



IV. Chondrus. Lamour. — Name, cartilage. 



V. Phyllophora. Greville. — Name, to bear a leaf. 

 VI. Polyides, Ag. — Name, many forms. 

 - VII. Furcellaria. Lamour. — Name, a little fork. 

 VIII. Dumontia. Lamour. — Name, M, Dumont. 

 IX. Halymenia. Agandh. 



X. Ginannia. Mont. — Name, Count Ginanni. 

 XI. Catenella. Grev. — Name, a little chain. 

 XII, Crouania, J. Ag. — Name, Brothers Crouan. 

 XIII. Rhabdonia. Harvey. 



Genus I. — Geledium. Lamour. 



Frond solid, corneous, pinnated, and linear. Fruit in swollen 

 ramuli. 



G. corneum. Variety crinale. Hudson ; New York Bay, &c. 

 G. Sp, ? or new. 



