' B OOLLINB WD Hi i:\i.y. 



ilu' upper m subspherical gonidangium, containing gonidia, 5 

 diam., usually 8 12 in Dumber; the lower eel] oboonicaJ with flat or 

 concave upper surface, contents bright blue-green; wall thick, some- 

 what lamellate. 



On older parts of fronds of Spermothamnion gorgoneum and 

 mothamnion Codii, which grew on Codium decorticatum, in company 

 with Xenococctu Schousboei, Lyngbya Menegkiniana and other small 

 algae. The cells are always scattered, never forming cushion-like 

 masses, as is the case with most species of Dermooarpa. The general 

 appearance of the plant is not unlike that of some small speci< 

 Codiolum, except for the shade of color, and that the colorless stipe 



IS shorter. 



2. D. i-kasiw (Reinsch) Bornet & Thuret, 1876, p. 75, PI. XXVI; 

 P. B.-A., No. 2051. Sphaenosiphon prannus Reinsch, L875, p. 

 PI. XII. Not D. prarina P. B. A.. No. 1, which is D. Farlowi 

 On Catenella Opuntia var. pinnata generally. 



Xexococcls Thuret. 



X. Schousboei Thuret in Bornet & Thuret, 1SS0, p. 74, PI. 

 XXX' I, figs. 1-2; P. B.-A., No. 2052. On Lyngbya amfervoides, in 

 ditch hack of Shelly Bay, Aug., Collins. Cells mostly separate 

 and exactly spherical; hut sometimes closely packed and compressed. 



Var. pallida Hansgirg, 18S9, p. 5. On algae on roof of cave, 

 Gravelly Bay, April, Collins. What may be a species of Xcnococcus 

 with minute cells was found on Oedogonium from Devonshire marshes, 

 hut could not be specifically identified. 



Family OSCILLATORIACEAE. 



Spirulixa Turpin. 



1. Trichome rose-color. 1. 8. 1 



1. Trichome aeruginous. 2. 



2. Trichome less than l p diam., spiral loose. 2. 8. tenerrima. 



2. Trichome over 1 ii diam., spiral close. 3. B. subsale mica. 



1. S. rosea Crouan ex Gomont, 1893, p. 273. Forming a pinkish 



film on Amphiroa between tide mark-. North Shore, Sept., Collin-. 

 *2. S. TENERRIMA Kiitzing ex Gomont, 1893, p. 27'2\ Kfitong, 



