THE MARINE ALG^l OF NEW ENGLAND. 155 



iii cavities on the branchlets ; cystocarps sessile on the branches, ovoid, 

 with a distinct terminal carpostome. 



Var. filifokmis, Harv., 1. c. 



Slender, elongate, with longer and less arching branches. 



On wharves, sponges, &c, below low- water mark. 



Quincy, Mass., Harvey ; common from Cape Cod southward. 



A common and characteristic species of Long Island Sound, forming very densely 

 branching tufts. The branches are usually arched backwards and hear secund branch- 

 lets which are much constricted at base. The arrangement of the tetraspores in cavi- 

 ties can easily be seen in fresh or alcoholic specimens, but not well in pressed plants. 

 It is principally on the authority of Zanardini that our species is united with his C. 

 uncihata, and as he had plenty of material for comparison his opinion is probably cor- 

 rect. The Adriatic specimens of G. uneinata which we have examined corresponded 

 better with the var. filiformis than with the more common secund form of Long Island 

 Sound. 



L. rosea, (Harv.) Thuret. (Chrysymenia rosea, Harv., Phyc. Brit., PL 

 358 a. — Ghylocladia rosea, Harv., Ker. Am. Bor., Part H, p. 186.) 



Fronds rose-colored, compressed, hollow, triangular in outline, main 

 divisions simple or once or twice forked, one and a half to three inches 

 long, an eighth to a quarter of an inch broad, tapering at the apex, pin- 

 nate with simple or pinnate, opposite, distichous branchlets, which are 

 much contracted at the base ; tetraspores tripartite, sunk in cavities in 

 the cortex of branches. 



On stones and shells in ten fathoms. 



Portsmouth, 1ST. H. j Newport, E. I., Harvey ; Gay Head, W. G. F.; 



Northern Europe. 



A rare and beautiful species, easily distinguished from the last by being broader and 

 flattened, with beautifully regular, opposite, distichous pinnae. As far as we know, 

 the cystocarpic fruit of this species has never been seen. It is tolerably abundant on 

 shells of Mytilus, in company with Seinaia furcellata, off Gay Head. 



CHAMPIA. 



(In honor of AT. Deschamps, a French botanist.) 



Fronds fdamentous, branching, hollow, nodose, formed of one or more 

 layers of roundish-angular cells with cellular diaphragms at the nodes, 

 traversed internally by a few longitudinal filaments ; tetraspores tripar- 

 tite, scattered in the cortex j cystocarps as in Lomentaria. 



A small genus, comprising about a dozen species, most of which are tropical or Aus- 

 tralian, our species, C.parvula, being the most widely diffused. The genus resembles 

 Lomentaria very closely in the cystocarpic fruit. The fronds, however, are not only 

 constricted at the joints, but are nodose throughout, a diaphragm composed of a sin- 

 gle layer of cells extending across the nodes. The tetraspores are not contained in 

 sunken cavities as in Lomentaria. A section of the cystocarps of C. parvula and X. 

 uneinata shows the same arrangement of the spores, but in the Jirst-named speaiea 

 the carpogenic cell is larger and projects further into the ooncepfcacle. 



