162 C R Y P T G A M I A. 



A very fine species, quite unlike any of the genus hitherto described. 

 It has the habit of an Iridcea, the abundant scattered fruit of a Ral- 

 ly men/la, and the essential structure of a Rhodymenia. 



Calophtllis laciniata, Ifillz. I. c. ; Harv. Ner. Bor. Am. 2, p. 171. 



Rhabdonia Coulteri, Harv. Ner. Bor. Am. 2, p. 154, t. 23. 



R. ra dice fibrosa ; caule eretio basi attenuate sursvm incrassato simplici 

 rarnos alternos emittente ; ramis inerassatis basi attenuatis vermicula- 

 ribus nunc nudis nunc alterne ramulosis patentibus ; coccidiis conicis 

 ? turner osis per rarnos sparsis. 



Hab. Puget Sound. (Monterey, California, Coulter.) 



Fronds rising from a mass of fibres, 6 to 8 inches long, much attenu- 

 ated below, gradually thickened upwards, and at length more than a 

 line in diameter above, shrinking much in drying, undivided, naked 

 below, furnished with alternate or secund branches above, from an 

 eighth to a fourth, or even half an inch apart. Branches from one 

 to three or four inches in length, tapering at the base, and thickened 

 upwards, obtuse and worm-like, or acute, naked, or with a few secon- 

 dary alternate branches, similar to the primary ones. Coccidia abun- 

 dant on the branches, prominent, conical. Structure dense ; the axis 

 composed of numerous filaments. Color a dark-purplish red. Sub- 

 stance cartilaginous, shrinking much in drying. — Description chiefly 

 from Coulter's specimens, which are more perfect than those brought 

 home by the Expedition. 



Amphiroa Californica, Becaisne; Harv. Ner. Bor. Am. 2, p. 86. 



Halosacciojst hydrophora, J. Ag. sp. 2, p. 358 ; Post & Ruppr. FL 



t. 25. 



Corallina officinalis, Ellis & Soland. ; Harv. Ner. Bor. Am. I. c. 



Prionites lanceolata, Harv. I. c. 2, p. 197, t. 27. 



Gigartina (Mastocarpus) Kadula, Kiitz. ; Harv. I. c. 



Gigartina (Mastocarpus) corymbifera, Kiitz. (G. Kadula, var.) 



Gigartina (Metrocarptjs) exasperata, Harv. & Bail. (Tab. 5.) 



G. fronde stipite mox in laminam coriaceo-ynembranaceam bi-tripedalem 

 lato-lanceolatam integram dilatata, margine incrassato eroso-dentato et 



