NO. 1 TAYLOR: PACIFIC MARINE ALGAE 197 



To the plant which B0rgesen calls /. capillacea he attributes a diame- 

 ter of 150 /jt, a length of 350-400 /* (interchanged by error in his text) ; 

 he considers that the obtuse-angled forking and occasionally recurved 

 branches are distinctive, but this is probably not so. The record in Hoyt 

 (1920, p. 527) calls for a diameter of 100-200 ju,, but figure 6 on plate 

 114 resembles neither J. adhaerens nor /. capillacea closely. There is 

 every reason to respect Howe's interpretation of Harvey's species /. capil- 

 lacea; the fact that he found segments often to be longer than Harvey 

 did is not surprising in view of the more ample material available. There 

 seems no particularly good reason for accepting Yendo's interpretation of 

 /. adhaerens, for the materials collected in Japan and the Red Sea or 

 Mediterranean may well have been different species. Rather, we should 

 judge Lamouroux's species by what we have of Red Sea material since 

 Kiitzing, who was in a good position to judge, did so; and that would 

 point to J. adhaerens being a stouter species with shorter, but not distinc- 

 tively shorter, segments. 



Ecuador: Esmeraldas, dredged from 5.4 meters' depth off San Fran- 

 cisco, no. 34-482 p. p., 11 Feb. 1934. 



Jania arborescens Yendo, prox. ? 



Plants about 1 cm tall, sparingly branched below, closely corymbosely 

 branched above, the lower segments 95-135 ju, diam., the upper little less, 

 in length the lower segments 0.55-0.85 mm, the upper segments somewhat 

 shorter, about three times as long as broad, not distinctively flattened. 



Yendo 1902, p. 25, pi. 3, fig. 5, pi. 7, fig. 6. 



These specimens may represent the same species as no. 34-169A, re- 

 ferred with some doubt to /. ungulata, and neither may be exactly like 

 the Japanese plants, but it seems best tentatively to distinguish the collec- 

 tions in some way until more ample material is available. 



Ecuador: Guayas, from rocks on the southeast side of Pta. Santa 

 Elena, Salinas, no. 34-472B, 8 Feb. 1934. 



Jania mexicana n. sp.^^^ 

 Plate 60 



Plants densely tufted, about 2 cm tall, the branching erect and dense, 

 subcorymbose ; axes below 170-205 /t diam., the segments 340-425 /t long, 

 the ultimate branches 120-150 ix diam., with apices obtuse conical; con- 



116 Jania mexicana n. sp.— Plantae caespitosae, ad 2 cm altitudine, ramificatione 

 erecta subcorymbosaque ; segmentis infra 170-205 m-, supra 120-150 |x diam.; apici- 

 bus ramorum obtuso-conicis; conceptaculis late pyriformibus, bilateraliter cornes- 

 centibus, et, saepe usque ad 4 furcationes crescentibus. Planta typica in loco dicto 

 Ba. Petatldn, Guerrero, Mexico, legit W. R. Taylor no. 34-569. 2 Mar. 1934. 



