OF ARTS AHB SCIENCES. 243 



the genus Prionifis, it may be readily distinguisliefl by its flabellate 

 habit. In some respects, it resembles in form Iridcea lacera, Post, and 

 Rupr. Ill, p. 17. 



SciiiZYMEXiA ? COCCINEA Harv. Santa Cruz, Cal., Dr. Anderson ; 

 San Diego, Mr. Cleveland. To this species, described in Jour. Proc. 

 Liunean Soc, Vol. VI., No. 24, is doubtfully assigned several large 

 specimens from California. 



Grateloupia Cutleri^, Binder. Santa Cruz, Cal., Dr. Anderson ; 

 San Diego, Mr. Cleveland. This very variable species has undoubt- 

 edly received several specific names, and it must be said that even 

 Gr. Gibbesii Harv., of our southern coast, is not decidedly distinct. If 

 one is to found species of Grateloupia on the outlines of the frond 

 alone, it will be easy to make almost any number of species out of 

 Gr. Cutlerice. 



Haltmenia decipiens, J. Ag. Key West, Mr. Hooper. 



Nemastoma Californica, n. sp. fronde gelatinosa roseo-purpurea 

 tereto-compressa basi alternata irregulariter pinnata ; pinnis pinnatis ; 

 pinnulis ultimis subuliformibus ; cystocarpii§ in corticali parte frondis 

 numerosis. — Santa Cruz, Dr. Anderson ; Santa Barbara, Miss Lenne- 

 backer. — This plant, which we formerly referred to Halymenia ligu- 

 lata under the name of variety Californica, differs in the structure of 

 the cortical filaments from. any species of Halymenia ; and granting 

 that the genera Halymenia, Nemastoma, Gloiosipho7iia,and Calosiphonia, 

 are nearly related to one another, the present species, owing to the fact 

 that the central siphon can be traced only at the tips of the branchlets, 

 cannot well be included in GloiosipJionia or Oalosipho7iia, nor in 

 Halymenia, since the cortical filaments are not united into a membrane, 

 as is more or less the case with the species of that genus. In aspect 

 the plant resembles rather closely Gloiosiphonia capillaris, and some 

 of the older specimens are not very unlike narrow forms of Halymenia 

 ligulata. It seems to be a connecting link between the genera Gloiosi- 

 phonia and Halymenia as far as the structure of the frond is concerned. 

 When freshly mounted, the species is of an agreeable purplish-rose 

 color ; but, as usually received from California, it is brownish, and dis- 

 torted by too heavy pressure. 



Griffithsia opuntioides Ag. Santa Cruz, Cal., Dr. Anderson. 



Griffithsia Bornetiana Farlow. In the Ner. Am. Bor., Harvey 

 refers the common Griffithsia of the North American coast to Griffith- 

 sia corallina, Ag., with some doubt, and describes a variety globifera 

 and a variety tenuis. In his Epicrisis, Agardh adopts the manuscript 

 name of Harvey, G. globifera, to designate the American species. 



