60 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



These plants suggest A. parvula Solms Laubach, but the disks and 

 especially the dorsal projections were larger than designated for that 

 species. The calcification could not be carefully studied because after 

 storage for 8 years in formaldehyde it had largely been destroyed. 



Mexico: Is. Revilla Gigedo, very rare as dredged from 25-32 meters 

 at sta. 139 off Braithwaite Bay, I. Soccoro, no. 34-16 (TYPE), 3 Jan. 

 1934. 



Bryopsidaceae 



Plants tufted, coenocytic, the axial coenocytes bearing radial or pin- 

 nate lateral branchlets which are not entirely cut off from the axis, but 

 which in mature plants may act as gametangia. 



BRYOPSIS Lamouroux, 1809 



KEY TO SPECIES 



1. Branching bilaterally pinnate at least in the distinctive plumose 

 ultimate divisions 2 



1. Branching radial, the last orders not distinctive . . B. hypnoides 



2. Erect axes pinnate on the upper half, the pinnules 130 ju, in 

 diameter or less B. galapagensis 



2. Erect axes pinnate near the tips only, though with irregularly 

 placed pinnules below in some cases, the pinnules 150 /j, diam. or 

 more B. pennatula 



Bryopsis hypnoides Lamouroux, prox. 



Collins 1909, p. 403; Taylor 1937, p. 97; Smith 1944, p. 73. 



This material formed rather involved soft tufts, relatively dark green 

 in color. The stronger axes were barely distinct, and their branches im- 

 perceptibly intergraded and were nearly as long. The branchlets were 

 never bilaterally arranged or plumose and reached 85 {x diam. 



Panama : infrequent in rock crevices in the intertidal flats at San 

 Francisco, Panama City, no. 39-142, 31 Mar. 1939. 



Bryopsis galapagensis n. sp.^*' 

 Plate 6, Fig. 1 



Plants small, light green, soft and delicate, 1-3 cm tall, the erect axes 

 infrequently branched, bearing distichous pinnules in a flat linear to ob- 



50 Bryopsis galapagensis n. sp. — Plantae subvirides, 1-3 cm altitudine, axibus 

 erectis sparse ramosis, pinnulas distichas in lamina a lineari ad lanceolatam vari- 

 ante, ad 15 mm long,, 3 mm lat., ferentibus; axe 130-370 \i diam., pinnulis 55-130 

 H diam. Planta typica in loco dicto I. Wenman, Ecuador, legit W. R. Taylor no. 

 34-83, 11 Jan. 1934. 



