492 BULLETIN OF THE BUREAU OF FISHERIES. 



1. Lomentaria uncinata Meneghini. PI. CIV, fig. 2. 



Lomentaria uncinata, Meneghini, in Zanardini, 1840, p. 215 (21). 

 Chylodadia baileyana, Harvey, 1853, p. 185, pi. 20 C. 

 Lomentaria uncinata, Farlow, 1882, p. 154, 

 Chylodadia 9 uncinata, De Toni, 1900, p. 574. 

 A. A. B. Ex. No. 75 (Lomentaria baileyana). 

 P. B.-A. Nos. 886, 1399- 



Frond rather terete, o.i to i mm. in diameter, r to 12 cm. tall, hollow throughout, not segmented 

 by constrictions, branching usually fairly profuse, irregular, often secund, branches tapering, often 

 recurved, sometimes becoming attached by their apices, branchlets fusiform, constricted at the base, 

 tapering at apex, and irregularly borne; tetrasporangia in slightly thickened branchlets; antheridia 

 usually occurring on separate plants, usually borne at the apices of branches, in enlarged, spherical 

 heads composed of short, radiating, club-shaped, 2 to 4 celled filaments arising from the cortical cells 

 and bearing the antheridia at their apices; cystocarps ovoid, sessile on the branchlets; texture gelati- 

 nous-membranaceous; color dull rose, sometimes yellowish or greenish. 



New England to Florida and West Indies; Mediterranean. 



Fairly abundant along town front and on Fort Macon jetties, Beaufort, N. C., April, 1908, occa- 

 sional on other algae and on Ascidian, Styela plicata, in harbor, summer and autumn, fairly abundant 

 on sea buoy, September, 1905. One small mass on buoy in sound, Port Royal, S. C., August, 1909. 



This species is most easily recognized by its recurved branches, which may bend down and become 

 attached at the apices. Stich branches may give off other branches from their convex sides, some of 

 which may in turn bend down and become attached, the continuation of this process giving rise to an 

 appearance like a series of arches. The plants of this species growing in the harbor at Beaufort in April, 

 1908, were well developed, being 2 to 4 cm. tall ; those found during the summer and autumn are minute, 

 scarcely recognizable forms i cm. or less in height. 



2. Lomentaria roses (Harvey) Thuret. PI. CIV, fig. 3. 



Chylodadia rosea, Harvey, 1853, p. 186. 

 Lomentaria rosea, Thuret in Le Jolis, 1863, p. 131. 

 Lomenlaria rosea, Farlow, 1882, p. 155. 

 Chylodadia rosea, De Toni, 1900, p. 575. 

 A. A. B. Ex. No. 17. 

 P. B.-A. No. 1241. 



Frond somewhat flattened, i to 4.5 mm. wide, 2 to 7.5 cm. tall, hollow throughout, not segmented 

 by constrictions, .branching usually profuse, branches straight, tapering, bearing numerous distichous, 

 opposite or alternate simple, or pinnate branchlets, which are lanceolate-oblong above a markedly 

 constricted base; tetrasporangia in the branchlets; cystocarps unknown; texture gelatinous-membra- 

 naceous; color bright rose. 



North Atlantic shores of America and Europe. 



One well-developed specimen on coral reef offshore, Beaufort, N. C., May, 1907. 



This species is readily distinguished from the preceding one by its flattened frond, with denser 

 habit, the branches not recurved at the apices, the branchlets being numerous, distichous, regularly 

 opposite or alternate, and greatly contracted at the bases. It is distinguished from Champia parvula, 

 which it somewhat resembles, by the lack of constrictions and transverse diaphragms segmenting the 

 frond. 



This is the southern known limit of the species. 



Genus 5. Champia Desvaux. 



Champia, Desvaux, 1808, p. 245. 



Frond terete or slightly flattened, hollow-tubular, but septate by thin, cellular, 

 transverse diaphragms occurring at more or less conspicuously constricted nodes, branch- 

 ing various; structure cellular, central axis lacking, thallus wall thin, composed of more 

 or less of three layers (a loose layer of elongated filaments bordering the internal tube 

 and sometimes scatteringly traversing this, connecting the diaphragms, a middle layer 

 of larger cells, and an outer layer of more or less numerous smaller cortical cells) , often 



