90 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Dr. E. Bornet and with an authentic specimen of G. serndatum from 

 herb. Agiirdh. It seems to nie that there can be no doubt that they 

 agree perfectly with G. serndatum and differ from G.filicinum although 

 the two species are certainly closely related. 



G. FiLiciNUM, Bory, Coquille, 162 (1820). — Albemarle Isl. : 

 Iguana Cove, Dec. 30, 1898, Snodgrass & Heller. Further distrib. 

 west coast of South America. 



But a single specimen was found which may be referred to this 

 species. 



GiGARTiNA, Stackh. 



G. Lessonii, J. Ag. Spec, Alg. ii. 268 (1851). Sphaerococcus 

 Lessonii, Bory, Coquille, 171 (1829), excl. syn. — Albemarle Isl.: 

 Elizabeth Bay and Iguana Cove, Feb. 1899, Snodfjrass & Heller. 

 Further distrib. Peru, Chili. 



Most of the specimens were small and sterile, but one had con- 

 ceptacles which in this species are borne at the base of small branchlets 

 rather than in well-marked papillae as in most species of the genus. 



Gracilakia, Grev. 



? G. RUGULOSA, Mont. Pole Sufl, 155, PI. 13, fig. 1 (1845) sub 

 Hypnea. — Albemarle Isl. : Iguana Cove. Snodgrass & Heller. 

 Further distrib. Australia. 



Two specimens with cruciate sporidia which agree well with the 

 description and figure of the habit of this species. Montague's figuie 

 shows sporidia which certainly are not zonate as in Hypnea, but may 

 be tripartite, although the figure is not quite clear on that point. The 

 Galapagos alga has cruciate sporidia and hence, in spite of its habit, can 

 be referred only with doubt to Montague's species. 



Gymnogongrcs, Mart. 



G. Griffithsiae, var. galapagensis, Pice. & Grun. in Piccone (1), 

 GO, & (2), 31. — ■Charles and Chatham Ids.: Marcacci, ace. to 

 Piccone, 11. cc. Endemic. 



G. melanothrix, Gruuow in Piccone (1), 60, & (2), 31. Gigartina 

 melanothrix, Bory, Coquille, 152, t. 19, f, 3 (1829.) — Charles and 

 Chatham Ids. : J/arcacci, ace. to Piccone, 11. cc. Further distrib. 

 Chili. 



G. VERMicuLARis, J. Ag. Spec. Alg. ii. 323 (1851.) Fucus ver- 

 micularis, Turn. Hist. Fuc. PI. 221 (1819); Piccoue (1), Gl. — 



