414 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



Bor., No. 170. Pinnules linear, subpatent, mucronate, distinct ; 

 sinus not rounded ; innovations of frond frequent, borne on long 

 pedicels. Bermuda. Indian Ocean. 



The forms above described are connected by intermediate 

 stages. The only species likely to be mistaken for C. crass/folia 

 is C. taxifolia, which has narrower, sickle-shaped, always opposite 

 pinnae. C. crassifolia forma pectinata, (Kiitz.) nov. comb.; C. 

 pinnata forma pectinata Weber, 1898, p. 291, with narrow frond 

 and short, patent pinnules, has been found at Guyana, and is to 

 be looked for in the more southern West India Islands. 



7. C. TAXIFOLIA (Vahl) Agardh, 1822. p. 435; Weber, 

 1898, p. 292; Vickers, 1908, p. 26, PI. XIJ ; P. B.-A., No. 

 768; C. asplenioides Greville, 1853, p. 2, PI. I, fig. i. Stolon 

 creeping, naked ; frond plane, lanceolate-linear, simple or 

 branched, pinnate, up to 30 cm. long; pinnules sickle-shaped, 

 always opposite, erect, distinctly contracted at the base, long- 

 attenuate at the tip, ending in a short mucro ; rachis slender. 

 W. I. lyitoral to 30 m. depth. 



In some respects intermediate between C. crassifolia and C. 

 sertularioides ; distinguished from both by the opposite, sickle- 

 shaped, narrow pinnules, with contracted base. 



8. C. ASHMEADI Harvey, 1858, p. 18, PL XXXVIII. A ; 

 Weber, 1898, p. 293; Alg. Am. -Bor., No. 36. Stolon stout, 

 creeping, naked ; frond simple or branched, up to 25 cm. high, 

 base usually naked, above bearing long, linear, distichous, usu- 

 ally opposite but sometimes alternate pinnules ; pinnules cylin- 

 drical or compressed, 2-3 cm. long, slightly increasing in 

 diameter from the base to the obtuse summit. Fla. from Jupi- 

 ter Inlet to Key West ; Bermuda, St. Thomas; 20-30 m. depth. 



Apparently a rare plant, and probably only from deeper 

 water than most species of the genus. 



9. C. SERTULARIOIDES (Gmel.) Howe, igosa, p. 576; Vick- 

 ers, 1908, p. 26, PI. Xlyll ; C.plumaris Harvey, 1858, p. 17, 

 PI. XXXVIII. C; Weber, 1898, p. 294, PI. XXIV, figs. 5 and 

 6; Alg. Am. -Bor., No. .169; P. B.-A., Nos. 27, 766. Stolon 

 creeping, naked*; frond simple or branched, plane, linear, pin- 

 nate, up to 25 cm. high ; pinnules opposite or subopposite, 

 cylindrical or compressed, patent, base slightly larger than the 

 curved and mucronate summit ; rachis narrow, interval between 

 pinnules as wide as the pinnule. lyitoral to 4 m. depth. Fla., 

 W. I. All tropical seas . 



