234 CERAMIACE^. v. 



distinct species. But Dr. Roche's specimens above noticed seem to connect Mr. 

 Cono'don's with some European varieties of this variable species. 



At Greenport, Long Island, 1 collected a CalUthamnion, infested by parasites and 

 otherwise in bad order, which at present I doubtfully refer to C. Borreri. These 

 specimens are more robust than the other North American ones, but not more so 

 than European states of the species, and despite some minor peculiarities I hesitate 

 to pronounce them different. Possibly more perfect specimens would compel us 

 to separate them. 



6. Callithamnion polyspermwn, Ag.; fronds densely tufted, capillary, much 

 branched, pellucidly articulate nearly to the base, decompound pinnate ; main 

 branches either naked or ramulose below, distichously plumulate above ; plumules 

 linear or oblong in outline, simply pinnate ; pinna3 incurved, obtuse, cylindrical, 

 nearly equal in length, the uppermost sometimes pinnulate near the tips ; articula- 

 tions of the stem mostly veinless, three or four times, of the pinnas twice or thrice 

 as long as broad ; tetraspores elliptical, solitary, or two or more together near the 

 base of the pinnaa. /. Ag. Sp. Alg. 2, p. 48. Harv. Phyc. Brit. t. 231. Phlebo- 

 thamnion polyspermum, Kiitz. Sp. Alg. p. 653. 



Hab, Hellgate, New York, Mr. J. Hooper. Jackson Ferry, Messrs. Walters and 

 Pike. Sullivan's Island, Charleston, Prof. L. W. Gibbes and W. H. H. St. Augus- 

 tine, Florida, Pi^of. J. W. Bailey, (v. v.) 



Tufts two to three inches high. Filaments capillary, irregularly branched from 

 the base, the main branches frequently naked below and distantly divided, their 

 divisions decompound-pinnate or closely plumulate in the upper half Plumules 

 distichous, broadly oblong or linear, rounded at the top, scarcely petiolate, the 

 lowest pinniB generally springing from the second articulation counting from the 

 base of the rachis ; pinnae simple, linear and obtuse, the upper ones not remarkably 

 shorter than the lower. Tetraspores frequently solitary on the second or third joint 

 from the base, elliptical, sometimes two or three or more on the same pinnule. 

 Favella;, near the ends of shortened plumules, in pairs. Colour^ a fine purplish-red, 

 given out in fresh water. Substance, soft, but not gelatinous. It closely adheres to 

 paper in drying. 



A variable species, allied on the one hand to C. Borreri, and on the other to 

 C. roseum. The above description is taken exclusively from American specimens, 

 which, though not strictly agreeing with the typical state, figured in Phyc. Brit.,iire: 

 very similar to many specimens from the South of England ; particularly to those 

 from Plymouth Harbour. 



7. Callithamnion byssoideum, Aim.; fronds densely tufted, of extreme tenuity, 

 very flaccid and tender, pellucidly articulate nearly to the base, excessively 



