46 COLLINS AND HEKVEY. 



record for this Mediterranean plant. The specimen is well developed 

 and characteristic. 



9. C. CRYSTALLINA (Roth) Kutzing, 1845, p. 213; 1854, p. 4, 

 PI. XIX, fig. II; Collins, 1909, p. 342; P. B.-A., No. 1865; Conferva 

 crystallina Roth, 1797, p. 196. Rein, as C. glaucescens; Gravelly 

 Bay, Feb., Dec., Hervey; Hungry Bay, April, North Shore, Harring- 

 ton Sound, May, Collins. A handsome plant, soft and silky, growing 

 on rocks on somewhat exposed shores, more commonly and luxuriantly 

 in quiet water, where it sometimes becomes detached and continues 

 growing in the floating state. 



10. C. FASCICULARIS (Mert.) Kiitzing, 1843, p. 268; Vickers, 1905, 

 p. 56; 1908, p. 18, PI. XIII; Collins, 1909, p. 345; P. B.-A. No. 

 2163; Conferva fascicularis Mertens in Agardh, 1824, p. 114. Har- 

 rington Sound, Feb., Hervey. A quite variable species, common 

 from Florida to South America, but found only once in Bermuda. 



11. C. piscinae sp. nov. P. B.-A., No. 2165. Filamentis pri- 

 mariis 100 /JL diarn.; ramulis ultimis 50 n; cellularum longitudine 

 diametrum 3-5-plo superante; nodis haud constrictis; cellula ter- 

 minali rotundata vel truncata, longitudine cellulas ceteras non super- 

 ante; ramificatione inferne per dichotomias patentes, distantes, 

 aequales, cellula dichotomias gerente plerumque sed non semper 

 ceteris breviore; ramis superne ramulos distantes, patentes, ferenti- 

 bus; colore laeteviridi; chromatophora laxe reticulata; substantia 

 subcrispa, nee fragili. 



Main filaments 100 /j. diam.; ultimate ramuli 50 M; length of cells 

 3-5 diam., nodes not constricted; terminal cell rounded or truncate, 

 not longer than other cells; branching below by wide, equal, distant 

 forkings, the cell bearing the forking usually but not always shorter 

 than the others; above with distant patent ramuli; color light green; 

 chromatophore a loose network; substance somewhat crisp but not 

 fragile. In an old fishpool at Godet's Island, Nov. 30, 1915. Type 

 in Collins herbarium, No. 8427. 



The water in this pool is quite still, the tide having access only by 

 small openings in the wall. The plant formed a loose mass, over one 

 meter in diameter, the lower part caught on coral; the appearance was 

 quite that of a loose Spirogyra. Though crisp to the touch, the fronds 

 collapsed immediately on being taken from the water; the living plant 

 is of a light green color, but this becomes dark in drying. There is 

 some similarity in the characters above to those of the description of 

 C. MacaUana Harv., but that is a stouter and stiffer plant, with differ- 

 ent habit. C. patens Kiitz. has cells 4-8 diam. long, larger main fila- 



