SIPHONACE^. 17 



flattened, two-edged, oblongo-ftilciite, miici'onulatc, scarcely constricted at base, their 

 margin entire. Sonder in Kiitz. Sp. Alff. p. Adi^. (Tab. XXXVII. A.) 



Hab. Keys of Florida, on submarine sands and sand covered rocks. Key West, 

 W. H. H. (No. 94.) Professor Tuomcy, 1^0. 12. Mr. Ashmead. (v. v.) 



Surcidi prostrate, extensively creeping, rooting from their under surface, branched, 

 twice as thick as hog's bristle, glabrous, glossy, longitudinally furrowed when dry. 

 Fronds springing from the upper surface of the surculi, nearly sessile, or on very short 

 stipites, broadly linear (in outline), 4-6 inches long, \-^ inch wide, either simple or 

 with one or two branches, pinnate or rather very deeply pinnatifid, from just above 

 the base to the bifid or emarginate extremity. RacMs piano-compressed, from one to 

 two lines wide, somewhat thick and fleshy when recent, horny and longitudinally 

 rugulose when dry, closely set throughout with the opposite, distichous pinnaj. Pinnce 

 from two to four times as long as broad, patent, the lower ones somewhat ovate, the 

 upper gradually more and more oblong and incurvo-falcate, vertically flattened, two edged, 

 mucronulate, entire ; the margin quite free from denticulations. Substance when dry 

 horny, membranaceous and glossy, semi-transparent. Colour a brilliant grass green, 

 variously tinged with yellow, and becoming slightly olivaceous when dry. 



This beautiful plant abounds at Key West, particularly under the bridge, where it 

 forms widely spreading patches. Bonder's specimens were sent from Mexico, but the 

 exact locality is not given. It is nearly related on the one hand to C. denticulata, Dne. 

 from the Red Sea ; and on the other to C. asplenioides, Grev. (in An. JSfat. Hist. vol. 12. 

 tub. 1. /. 1.) a native of the East Indies, if indeed that species be really different. It 

 also bears much resemblance to C. taxifolia, Ag., but the pinnae are broader, more 

 sharply two-edged, and distinctly mucronulate. 



Plate XXXVII. A. Fi(j 1. Caulerpa Mexicana ; the natural size. Fig. 2, a 

 pair of pinnte, magnified. 



.3. Cadlerpa j^lumaris, Ag. ; surculi naked, glabrous ; fronds erect, subsessile, dis- 

 tichously pectinato-pinnate ; rachis (narrow) filiform ; pinnaj opposite, slender, 

 filiform, setaceous, incurved, or subfalcate, either acute or sub-obtuse. Ag. Sp. Alg. 1, 

 p. 436. Kiitz. Sp. Alg. p. 496. Bory., Voy. Coq. tab. 22,/. 4. Corradoria plu- 

 maris, Trevis. in Linn. 22, p. 133. Fucus taxifolins, Turn. t. 54 (exd. syn.) Fucus 

 plumaris, Forsk. (Tab. XXXVIII. C.) 



Hab. Sandy shores, on the Florida Keys. Key West, W. H. H., Professor Tiwmey, 

 Mr. Ashmead, (v. v.) 



Surculi prostrate, rooting from the under surface, a line or more in diameter, branched, 

 glabrous, glossy, collapsing, and becoming longitudinally furrowed when dry. Froiids 

 numerous, rising from the upper side of the surculi, erect, simple or with one or two 



D 



