328 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



M. 40, 46, 67, cast ashore, Eureka, May; M. 41, Guaymas, May; 

 J. 18b, on rocks in lower littoral zone, Tortuga Island, June; D. 635, 

 middle littoral rocks, San Jose del Cabo, Feb. 



The limited collections would seem to indicate a more or less tropical 

 distribution for this species in our area. A small specimen from Santa 

 Maria Bay on the outer coast resembles the type of var. laxa and sug- 

 gests a distribution extending up the southern outer coast of the peninsula. 



For the sake of simplicity, the named varieties are here reduced to 

 synonymy in view of the absence of additional, and the inadequacy of 

 the original, material. 



Laurencia Johnstonii S. & G. 



Setch. & Card., 1924, p. 764, pis. 52a, 53. 



Mature specimens of this plant, probably a near relative of Laurencia 

 obtusiuscula, are known from summer collections in the northern Gulf. 

 Its very dark color and relatively dense branching serve to distinguish it. 



J. 30a, San Francisquito Bay, June; J. 127, on rocks in lower littoral, 

 San Marcos Island, June; D. 203, lower littoral rocks, reef at Turner's 

 Island, January (young), D. 749, July (mature). 



Laurencia sinicola S. & G. 



Setch. & Gard., 1924, p. 764, pi. 28, figs. 65, 66, pi. 50a. 



M. 34, 37, growing on Sargassum, Eureka, May; J. 126, San Marcos 

 Island, June. Not again collected. Apparently a summer annual. 



Laurencia estebaniana S. & G. 



Setch. & Gard., 1924, p. 763, pi. 24, fig. 33, pi. 45a. 



J. 53c, growing on rocks at San Esteban Island, April ; J. 89, Smith 

 Island, June. Not again collected. 



Laurencia Hancockii sp. nov. 

 Plate SO, Fig. 1 



Frondes usque ad 2 cm. altae, siccitate atrae, cylindricae, prorsus graciles, 

 rhizinis laxis curtisque affixae, valde ramosae et e basi divergentes, axi percurrenti 

 deunte; ramelli circa 300 (a crassis, corticibus palisadiformibus deuntibus, cellulis 

 omnibus diam. equalibus. 



Plants to 2 cm. high, cylindrical, slender throughout, attached by 

 short, loose rhizoids, much branched and divergent from the base, form- 



