48 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



lovr-Tvater mark. It cau be distinguislied from the preceding species by its lighter 

 color, by being less rigid, and by the smaller size of the cells, ^hich are rather uni- 

 formly as broad as long. If we may suspect that C. Ficquotiana is only a form of C. 

 meJogonium, we may also suggest that the present is possibly the corresponding form 

 of C. cerea. To unravel the synonymy of the species is quite hopeless. Our specimens 

 agree with No. 353 of Crouan's Algues Marines du Finistere and No. 183 of Ares- 

 choug's Algae Scandinavicse, both of which are supx)osed to be the Conferva Linum of 

 the Flora Danica. They are also identical with No. 355 of Hohenacker's Meeralgen, 

 which purports to have been determined as C. lierhacea, Kg., by Kiitzing himself. 

 Whether they are the same as the Conferva Linum of the Phycologia Brittanica we 

 cannot determine. They approach very near to, if they are not identical with, C. 

 crassa of the Italian algologists. In fact, Crouau considers C. Linum, Fl. Dan., to be 

 the same as C. crassa, Ag. The Cluetomorplia sutoria of the Nereis Am. Bor. seems to 

 us the same thing. We have examined Bailey's specimens, from which Harvey named 

 the species in the Nereis, and have also examined. Bailey's locality, at Stonington. 

 To the naked eye, in Bailey's specimens, the filaments ai^pear smaller than the typical 

 form, but a microscopic examination gives the same measurements as specimens we 

 collected ourselves, \N'hich agreed precisely with No. 353, Crouan. In saying that the 

 New England specimens of C. sutoria should be considered to be rather C. Linum, Ave do 

 not mean to imjily that the European C. sutoria is not distinct. Whether our species 

 is the same as Rliizoclonium Linum, Thuret, is, perhaps, doubtful. In specimens of the 

 last-named species from Cherbourg the filaments appear to be somewhat smaller. The 

 species usually, but not always, loses its color drying, and scarcely adheres to pai^er 

 unless under considerable pressure. 



SPECIES INQUIEEND^. 



C. Olneyi, Harv., Xer. Am. Bor., Part III, p. m^ PI. 46 d. 



"Filaments tufted, setaceous, straight or curved, soft, pale green j 

 articulations once and a half as long as broad." (Harvey, 1. c.) 



Rhode Island, Olney. 



C. LONGiARTicuLATA, Harv., Xcr. Am. Bor., Part III, p. 86, PI. 46 e. 



"Filaments capillary, curved, loosely bundled together, flaccid, soft, 

 pale green J articulations 4-6 times as long as broad, s\rollen at the 

 nodes j var. ;?, crassior^ filaments more robust." (Harvey, 1. c.) 



In rock-pools, between tide-marks. Ship Anne Point, Mr. Hooper ; 

 Boston Bay, Mrs. Asa Gray ; Little Compton, 2Ir. Olney ; var. /3 in 

 brackish ditches at Little Compton, Mr. Olney. 



The two last species are only known from the descriptions in the Nereis. No au- 

 thentic specimens exist in the Olney Herbarium, which is now the property of Brown 

 University. The specimen of C. Olneyi mentioned in Algce Bliodiacece by Olney was 

 determined by the present writer, not by Harvey himself, and a recent examination of 

 the specimen, for which we are indebted to the kindness of Professor Bailey, lead us 

 to think that the specimen was not correctly determined. 



EHIZOCLOXIUM, Kiitz. 



(From pi^ov, a root, and kauv, a branch.) 



Filaments decumbent, entangled, branches short and root-like. 



The genus is easily recognized, as a rule, by the root-like character of the branches. 



In some species the branches are frequent ; in others, however, they are only occa- 



