JUAN-FERNANDEZ ISLAND AXD HONOLULU. 453 



SlPilONACEiE. 



Codium tomextosum, Stackh. 



A slightly branched variety 2 lo 3 feet long. 



Ulvaceje. 



Ulva latissima, L. 



Enteromorpiia intestinalis. Link. 



Both species are dwarf. 



CONFERVACET. 



Ch/ETomorpha /erea, Dillw. 



C. TORTUOSA, Dillw. 



DlATOMACEJE 



Cocconeis SC TELLUM, Ehr. 



Forming a white crust on Gigartina. 

 Melosira nummuloides, Ktz. 



Gramm atophora marina, Ktz. 



BlDDULPHIA AURITA, Brcb. 



B. pulchella, Gray. 

 Climacosph^ria moxiligeea, Ehr. 



(6) Alga? found at Honolulu Harbour. 



FuCACEJE. 



Sargassum obtusifolium, J. Ag. 



S. dexsum, n. sp. ? 



Frondibus ex collo in caules plures divisis ; ram is parce muriculatis, 

 foliis linearibus obtusis, costatis, dense stipatis, hinc et hinc furcatis, 



nraltiplice glandulosis ; receptaculis linearibus, terminalibus, furcato- 

 ramosissimis ; vesiculis 



S. incisum, n. sp. ? 



Foliis linearibus crispatis, inciso-dentatis, ad apicera costatis, dnplici 



aerie glandulosis ; vesiculis terrainalibus sphrerieis, nuiticis, glandulo- 



sis, breviter pedicellatis. Receptaculis — ? 



Turbinaria vulgaris, /. Ag. 



DlCTYOTACEJS. 



Pictvota spinulosa, Harv.l 



A solitary specimen, not quite perfect, seems to belong to this 

 species. 



Asperococcus bullosus, Lamx. 



