54 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



by the large size of tlie filaments and remoteness of the branches, togethej with the 

 shortness of the ultimate branches. The Cladophora diffusa of the Phycologia Brit- 

 tanica is now considered, with good reason, to be a form of C. HuicMnsice in which 

 the branches are very long and nearly destitute of branchlets. Probably the Clado- 

 phora diffusa? of the Nereis Am. Bor., said by Harvey to be found in "New York 

 Sound," is to be referred to the present species. Specimens which correspond well 

 enough to the C. diffusa o£ the Alga? Danmonienses, No. 144, have been collected by Mrs. 

 Davis and Mrs. Bray at Gloucester. 



0. flexuosa, (Griff.) Harv. 



" Filaments very slender, pale green, tufted, flexuous, sparingly and 

 distantly branched ; branches elongate, subsimple, of unequal length, 

 flexuous, sometimes nearly naked, sometimes ramuliferous j the ulti- 

 mate ramuli secund or alternate, short or long, curved j articulations of 

 the branches 3-4 times, of the ramuli twice as long as broad." (Nereis 

 Am. Bor., Part III, p. 78.) 



Rocks between tide-marks, &c. 



Hingham and Boston, Mass. ; Jackson Ferry and Hell Gate, N. T. 



We have quoted from the Nereis Am. Bor. the description given by Harvey of the 

 present species, and have purposely refrained from adding any localities of our own. 

 Harvey considers C. flexuosa very nearly related to CI. glaucescens, if indeed it is distinct 

 from it. On the other hand, the greater part of the French specimens of C. flexuosa 

 which we have seen are quite distinct from C. glaucescens, and seem to approach some 

 of the forms of C. gracilis. We have frequently seen at Wood's Holl, Newport, and 

 Gloucester specimens which correspond pretty well with the C. flexuosa of Alg. Dan- 

 mon., No. 227. As we understand the species, it is more rigid than CI. glaucescens, 

 and has shorter branches, which are at times refracted. The cells are .02-6 mm in 

 diameter and not more than two or three times as long as broad as a rule. Le Jolis 

 states that C. flexuosa lines the bottom of pools. The American forms which we would 

 refer to this species are found in pools on rather exposed rocky shores. 



0. Morrisi^:, Harv. 



"Tufts elongate, dense, somewhat interwoven, dark green ; filaments 

 very slender, much and irregularly branched ; the penultimate branches 

 very long, filiform, flexuous, simple, set with alternate or secund, short, 

 erecto-patent ramuli, some of which are simple and spine-like, others 

 pectinated on their upper side; articulations filled wi(h dense endo- 

 chrome, in the branches 2-3 times, in the ramuli about twice as long as 

 broad, cylindrical, not contracted at the nodes." (Harvey, Nereis 

 Am. Bor., Part HI, p. 79, PI. 45 6.) 



Elsinborough, Del., Miss Morris. 



We only know this species from the description and plate of Harvey. 



0. Rtjdolphiana, Ag. 



Filaments very long and gelatinous, forming loose tufts one or two 

 feet long, color yellowish green ; branches opposite or irregular, very 

 long and flexuous, given off at Avide angles, clothed with long, secund, 



