12 



than the constriction of the rachis. The form of ramenta varies 

 in several fronds. Basal ones are generally shorter than the upper 

 and they are obovate, while the upper ones are oblong or sub- 

 clavato-cylindrical, their apical portion being a little thicker than 

 their basal portion. They attain a length of 2-5 mm. being ca. 

 1.5 mm. thick, that is subequal to diameter of the rachis. Color 

 of plant is grass-green, which is well preserved in drying, or in 

 older fronds it fades to a dull straw color. Substance is soft and 

 the plant imperfectly adheres to paper in drying." Okam. /. c. 



Hab, : On rocks covered with sand, near low tide. Nomo 

 (near Nagasaki), Amakusa-jima, Provs. Kii, Suruga, Mikawa, 

 Sagami, Boshyu, Hitachi, Iwaki, Noto and Ugo. 



Geogr. area : Ponape and Truck. 



f. OligOphylla Okam. n. f. PL CLIV., Eig. 7. 



Syn. f Caulerpa tateyamensis Yendo Three New Mar. Alg. fr. Japan. 

 (Bot. Mag. Tokyo, Vol. XVII, p. 99, PI. Ill, f. 1-3). 



Fronds much elongated, often 15 cm. long or more, irregularly 

 branched ; ramenta almost none or very few present, sometimes 

 here and there a little imbricated which are pedicelled as the type 

 species or sessile. 



The present plant is evidently an aberrant form of C. Oka- 

 mnrai, as is shown by the nature of ramenta. It is abundantly 

 obtained by trawling in the water 2-3 fathoms deep at Bay of 

 Tateyama, Prov. Boshyu, where the type-form is also observed. 

 Mr. Yendo described a Caitlcrpa from the same locality as a new 

 sp., C. Tateyamensis, which is probably same as the form here 

 mentioned, though I am not able to see his specimen. 



PL. CLIV, fig. 1-8. Fig. 1: frond of Caulerpa Okamurai Weber-v. 

 Bos. \. Fig. 2 : portion of frond, -J-. Fig. 3 : growing apex, a, 1 1 3 . Fig. 



