371 



collected by the United States Exploring Expedition, as 

 follows : — 



NoTHEiA, Nov. Gen. Fucoidearum. 



Frons (parasitica) filiformis, prolifera, solida. Scaphidia per 

 totam frondem sparsa, in strato corticali infra superficiem exca- 

 vata, sphserica, cum ostioli superficiali per canalem communi- 

 cantia. SporcE inter perisporium hyalinum lineari-obovatum 

 parietali nidulantur. Paranemaia simplicia. 



Alga parasitica, pusilla, organis nuUis discretis, quasi recep- 

 taculis Cystoselrje vel Sargassi habitu referens. 



1. Noiheia anotnala. Harv. et Bail. 



Bay of Islands, New Zealand, parasitical on Hormoseira 

 Sieheri. 



2. Dasya (Stichocarpus) plumosa H. et B., fronde inarticulata 

 compressa ancipite bi-tripinnata, pinnis elongatis, pinnulisque 

 brevibus alternis, ramellis monosiphoniis distichiis, crebris, ssepius 

 oppositis strictis simplicibus vel furcatis, axillis angustiformis, 

 ariiculis rameilorum cylindricis, diametro triple longioribus. 

 Hah. Puget Sound, N. W. America. 



3. Rhodomenia Wilkesii H. et B., stipite brevi cartilaginea 

 compressa mox cuneato-plana et in laminam 1-3 pedalem lato- 

 lanceolatam sub-indivisam membranaceam sanguineo-albescen- 

 tem, explanata, coccidiis numerosissimis per frondem densissime 

 sparsis. Hob. Straits of St. John de Fuca, N. W. America. A 

 fine species having the habit of an Iridasa ; the fruit of a Kally- 

 menia, and the structure of Rhodomenia. 



4. Hypriea CouUeri, Harv., radice fibrosa, caule erecto basi 

 attenuate sursum incrassato simplici ramos alternos emittente, 

 ramis basi alternatis incrassatis vermicularibus nunc nudis nunc 

 .alterne ramulosis patentibus, coccidiis conicis numerosis per 

 ramos sparsis. Harv. in Smith. Mem. ined. Hab. California, 

 Dr. Coulter ; Puget Sound, Ex. Exped. 



5. Gigartina (Mastocarpus) exasperata H. et B., frondis 

 stipite mox in laminam coriaceo-membranaceam bi-tripedalem 

 late lanceolatam integram dilatata, margine incrassato eroso- 



