46 COLLINS AND HEEVET. 



record for this Mediterranean plant. The specimen is well developed 

 and characteristic. 



9. C. CRTSTALLIXA (Eoth) Kiitzing, 1845, p. 213; 1854, p. 4, 

 PL XIX, fig. II; Collins, 1909, p. 342; P. B.-A., Xo. 1865; Cmferva 

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

 Bay, Feb., Dec, Hervey; Hungry Bay, April, X'orth 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. FASCiCTiLAEis (Mert.) Kiitzing, 1843, p. 268; Vickers, 1905, 

 p. 56; 1908, p. 18, PI. XIII; Collins, 1909, p. 345; P. B.-A. Xo. 

 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. FUamentis pri- 

 mariis 100 ;u diam.; ramulis ultimis 50 fx; ceUularum longitudine 

 diametrum 3-5-plo superante; nodis baud constrictis; ceUula ter- 

 minali rotundata vel truncata, longitudine ceUulas ceteras non super- 

 ante; ramificatione infeme per dichotomias patentes, distantes, 

 aequales, cellula dichotomias gerente plerumque sed non semper 

 ceteris bre^iore; ramis supeme ramulos distantes, patentes, ferenti- 

 bus; colore laete\'iridi; chromatophora laxe reticulata; substantia 

 subcrispa, nee fragUi. 



Main filaments 100 ^ diam.; ultimate ramuli 50 >i; length of cells 

 3-5 diam., nodes not constricted; terminal cell roimded 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 stUl, the tide having access only by 

 small openings in the waU. 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 

 coUapsed 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. Macallana Harv., but that is a stouter and stiff er plant, with differ- 

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



