NO. 1 TAYLOR: PACIFIC MARINE ALGAE 65 



marked constriction and ultimately developing a marked pseudoseptal 

 thickening, the supporting segment not bifurcate at the top; diameter of 

 filaments 148-185 /x, branching intervals 0.2 mm to 1.0 cm or more, the 

 apices obtuse. 



Mexico: Oaxaca, intertidal rocks in Ba. Tangola-Tangola, no. 34- 

 558B, 28 Feb. 1934. Is. Revilla Gigedo, abundant in the littoral and in 

 tide pools about Braithwaite Bay, I. Soccoro, nos. 34-1, 34-24B (TYPE), 

 2 Jan. 1934. Ecuador: Guayas, south side of Pta. Santa Elena, 

 Salinas, Schmitt no. 5C, 16 Sept. 1926. Ibid., on the rocky southeast 

 side of Pta. Santa Elena, no. 34-458A, 8 Feb. 1934. 



When best developed, this species was tufted, but it often grew in an 

 expanded turf. The branches in these plants are at first simply contracted 

 at the base to 0.5-0.66 their full diameter, but later at this point the wall 

 gradually becomes greatly thickened, so that the cavity is nearly divided. 

 It seems that in old filaments a true wall sometimes finally does complete 

 this septum, but it is hard to be sure. 



This is probably the Clarion I. plant referred to C. comosa Harv. & 

 Bail. (1851, p. 373) by Setchell and Gardner (1930, p. 115). From C. 

 comosa as interpreted by Okamura (Algae Japonicae Exsiccatae no. 96; 

 1936, p. 107, fig. 55) this species differs in a less well-developed base, it 

 being not at all stalklike, and in that the filament segments at the forward 

 end were not at all bifurcate below the articulations, as his were. It is 

 also coarser, the filaments in his specimen hardly exceeding 130 \i. Mate- 

 rial from the earliest collection of C. comosa in the U.S. National Her- 

 barium consists of 9 individuals mounted on a piece of blue paper. The 

 label is the blue printed one of the U.S. North Pacific Exploring Expe- 

 dition under the command of Comm. Cadwallader Ringgold and Lt. 

 John Rogers, 1853-56, with Chas. Wright as collector. The place is indi- 

 cated faintly in pencil as "Feeji Ids." However, while it is from the 

 same part of the world, Harvey indicates that the type material was 

 brought back by Captain Wilkes from the U.S. Exploring Expedition, 

 1838-42, and by inference was collected by Dr. Chas. Pickering, after 

 whom a Caulerpa was named. This material the writer has not seen. 

 Information regarding these expeditions is given by Meisel (1924-29). 



Of the Wright specimens, four show no stalklike part, though the 

 bases are compact and felted, but the others show a free filamentous 

 portion 3.0-4.5 cm long and a paler portion with the filaments held 

 together somewhat at the top and clearly felted below, the whole being 

 7-15 mm long. The upper part of the base may well be stalklike simply 

 because it had been squeezed between the fingers to drain it before mount- 

 ing, but below the filaments are clearly intertwined. The free filaments 

 are 65-115 /a diam., and in most cases there was a little, or even consider- 



