NO. 1 TAYLOR: PACIFIC MARINE ALGAE 53 



macropus) for the Javanese C. pacifica, which he considers a synonym of 

 the Panamanian C. antennina, is 24 mm long. On close inspection of the 

 plate it is evident that the two basal cells shown are 14 mm and 15 mm 

 long, respectively, and each is cut off from a suprabasal cell which is also 

 longer than the vegetative cells above it. In Kiitzing's figures these cells 

 are 7 mm and 6 mm long, respectively. In the Petatlan material of the 

 present collections, which was of smaller stature, the length of the supra- 

 basal cell was 1.9-2.6 mm, and that of the cell next above it 1.2-1.9 mm. 

 Here the difference was usually marked, averaging almost 50 per cent, 

 about as much as in Kiitzing's figures, but in other Pacific specimens from 

 several sources this character was found not to be altogether reliable. 

 B0rgesen, after taking a contraiy stand, decided (1940, p. 37) that C. 

 media was a synonym of C. antennina, for he found such variation that 

 he was not able to delimit the species to his satisfaction. The present 

 writer finds it more satisfactory for the present to retain the distinction. 



Mexico: Nayarit, common on surf-beaten rocks of I. Maria Magda- 

 lena. Las Tres Marias, no. 39-635, 9 May 1939. Guerrero, in tufts on 

 rocks in the surf zone. White Friars Is., no. 39-626, 1939. Ibid., in the 

 surf of the lower littoral, Ba. Petatlan, no. 34-567, 2 Mar. 1934. Pan- 

 ama: scarce in the higher tide pools. Is. Secas near Puerto Nuevo, no. 

 39-124, 26 Mar. 1939. Ecuador: Archipielago de Colon, on the rocks 

 at the south side of Banks Bay, I. Isabela, no. 34-134, 13 Jan. 1934. 

 Guayas, on the south side of Pta. St. Elena, Salinas, Schmitt no. 5A, 16 

 Sept. 1926. Ibid., on the rocky southeast side, no. 34-459, 8 Jan. 1934. 



Chaetomorpha brachygona Harvey, v. crassipellita n. v.^^ 



Filaments in tangled masses, flexuous, the diameter 128-170 /x, rarely 

 to 205 )n, the cells 0.75-1.50 diameters long, generally equal or shorter, 

 not or but very slightly contracted at the septa, the wall rather thick ; not 

 adhering to the mounting paper. 



This material is quite different in texture from the Caribbean speci- 

 mens of C. brachygona, although of about the same size. As it grew under 

 somewhat special environmental conditions, it seems best to associate it 

 with C. brachygona (Taylor 1942, p. 23) until more is known of its 

 variation. 



Ecuador: Archipielago de Colon, in a lagoon south of Banks Bay, 

 I. Isabela, no. 34-133 (TYPE), 13 Jan. 1934. 



45 Chaetomorpha brachygona v. crassipellita n. v. — Filamenta 128-170 |li diam., 

 cellulis 0.75-1.50 plo longioribus quam latis, cylindricis aut ad septa paululum 

 constrictis, membrana crassa. Planta typica in loco dicto Banks Bay, I. Isabela, 

 Ecuador, legit W. R. Taylor no. 34-138, 13 Jan. 1934. 



