THE MARINE ALG2E OF NEW ENGLAND. 47 



common in Long Island Sound, but is little known north of Cape Cod. It "-rows in 

 pools, sometimes near high- water mark, and resembles in habit C. melagonium, from 

 •which it differs in color, in being much less rigid, and in the smaller size -of its cells. 

 As found ou our coast, the filaments are rather more slender than the average of 

 European specimens. 



C. Picquotiana, (Mont.) Kiitz. (Conferva Picquotiana, Ann. Scien. 

 Nat., 3d Ser., Vol. XI, p. GO. — Chcctomorplia Piquotiana, Ner. Am. Bor., 

 Part III, p. 85, PI. 46 c.) 



Filaments prostrate, intricately twisted together in masses, rigid, 

 dark-green, cells .2-4 mm broad by .2-1.6 mm long, slightly oval in shape. 



Deep water, and washed ashore. 



Rather common from Boston northward; Staten Island, Harvey; 

 Gay Head, Mass. 



This species was first described by Montagne from specimens collected by Lamare- 

 Picquot in Labrador. It is the largest of our prostrate Chcctomorphw, and north of 

 Boston is not uncommon on beaches after a storm, but it has not been seen in tide-pools. 

 The localities South of Cape Cod perhaps need revision. We have found the species 

 washed ashore at Gay Head, from deep water. It reminds one of C. melagonium by 

 its color, rigidity, and size of the filaments, and it seems to us probable that it is 

 merely an advanced stage of that species which has broken from its attachments and 

 become entangled without having lost its power of growth. It is certainly very 

 unlikely that any alga of this suborder is throughout its whole period of existence 

 unattached. The cells differ from those of C. melagonium in being sometimes several 

 times longer than broad, but, on the other hand, they frequently are found no longer 

 than broad. If the species is really distinct and not an older stage of C. melagonium, 

 as we suspect, it is the largest and coarsest of our species, and is to be compared with 

 C. iorulosa, Zan, of which we have examined specimens collected by Hauck at Pirano, 

 in the Adriatic. In drying, our species does not adhere to paper, and the cells con- 

 tract at the joints so as to give a toruloid appearance. 



C. Lintjm, (Flor. Dan.) Kiitz. (Conferva Linum, Crouan, Algues 

 Marines du Finistere, No. 353. — Conferva Linum, Areschong, Alg. 

 Scand., Xo. 183. — Chcctomorplia herbacea, Kiitz., in Hohenacker's Meeral- 

 gen, No. 355. — Chwtomorpha Linum, Kiitz., Spec. Alg., p. 378. — Chceto- 

 morpha sutoria, (Berk.) Harv., Xer. Am. Bor., Part 3, p. 87. — Non 

 Conferva Linum, Alg. Danmon., Xo. 220, nee Rhizoclonium Linum, 

 Herb. Thuret.) 



Filaments prostrate, intricately twisted together in masses, rigid, 

 bright green, cells .20-25 mm broad by .20-30 mm long, about as broad as 

 long. 



Just below low- water mark. 



Common in Long Island Sound; Xahant, Ten Pound Island, Glou- 

 cester, Mass.; Europe. 



The confusion which has arisen from the application of the name Conferva Linum to 

 different species and the useless multiplication of names, especially on the part of 

 Kutzing, makes it exceedingly difficult to ascertain the name of this common species 

 on our coast. It forms strata of considerable extent upon rocks and gravel just below 



