SIPHONACEiE. 
17 
flattened, two-edged, oblongo-falcate, mucronulate, scarcely constricted at base, their 
margin entire. Sonder in Kutz. Sp. Alp. p. 49b. (Tab. XXXVII. A.) 
Hab. Keys of Florida, on submarine sands and sand covered rocks. Key West, 
W.H. H. (No. 94.) Professor Tuomey , No. 72. Mr. Ashrnead. (v. v.) 
Surculi 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. Pachis 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 pinnae. Pinnae 
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. Sonder’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. Nat. Hist. vol. 12. 
tab. 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. Fig 1. Caulerpa Mexicana ; the natural size. Fig. 2, a 
pair of pinnae, magnified. 
3. Caolerpa plumaris , Ag. ; surculi naked, glabrous ; fronds erect, subsessile, dis- 
tichously pectin ato-pinn ate ; rachis (narrow) filiform ; pinnae opposite, slender, 
filiform, setaceous, incurved, or subfalcate, either acute or sub-obtuse. Ag. Sp. Alg. 1, 
p. 436. Kutz. Sp. Alg. p. 496. Bory , Voy. Coq. tab. 22, f. 4. Corradoria plu- 
maris, Trevis. in Linn. 22, p. 133. Fucus taxifolius, Turn. t. 54 (excl. syn.) Fucus 
plumaris, Forsk. (Tab. XXXVIII. C.) 
Hab. Sandy shores, on the Florida Keys. Key West, W. H. H., Professor Tuomey , 
Mr. Ashrnead, (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. Fronds 
numerous, rising from the upper side of the surculi, erect, simple or with one or two 
D 
