502 HOWE: PHYCOLOGICAL STUDIES 
complanata Collins (Phyc. Bor.-Am. 8 36) from Florida, but in that 
the segments are only 2 mm. instead of 5-12 mm. broad and the 
cystocarps are not confined to the Margins. 
SCINAIA FURCELLATA UNDULATA (Mont.) J. Ag. Sp. Gen. et Ord. 
Ig. 2: 422. 1852 
Ginnania undulata Mont. Voy. Bonite, Bot. Crypt. 59. pl. 145. f. 3. 
1844. 
La Paz, Vives rrd and 20b. 
This differs from Scinaia latifrons as noted above. 
The two specimens seen have a length of 10-14 cm. and their 
segments are about 2 mm. wide. The segments are probably 
terete or nearly so in life, though they do not regain that form on 
being soaked out. 
separate it specifically from Scinaia furcellata. 
(?) GIGARTINA CHAMISSOI (Mert.) Mont. Voy. 
Bonite, Bot. Crypt. 71. 1844 
San Felipe Bay, D. T. MacDougal, Feb, 1904. 
The plants are rather small (3-8 cm. long), but are probably 
nearer to G. Chamissoi than to any other described species. The 
main segments are 2-10 mm. broad and are less regularly pinnate 
and less elongate than in G. Chauvinii ( Bory) Mont. The nar- 
Tower specimens resemble certain broader conditions of G. Teedii 
Anatheca dichotoma Sp. nov. 
Thallus cuneate-attenuate at base, subcartilaginous or some- 
what gelatinous, reaching a length ‘of 25 cm., mostly 7-11 times 
and wi i 
