MR. E. M. HOLMES ON MARINE ALG FROM JAPAN. 259 
GRATELOUPIA (DICHOTOMA, var.?) JAPONICA, Grun. in litt. 
(Pl. XII. fig. 4.) ; fronde Gr. dichotome simili, subcartilaginea, 
humili, pulvinatá, segmentis magis patentibus, apicibus obtusis 
fastigiatis, prolificationibus nunc raris vel nullis, nunc creberrimis. 
Hab. ad litora Japonie (Tanaka, in Mus. Vindob. no. 25). 
The specimens are about 21 cm. high and 14 cm. broad, 
brownish violet or greenish. The cortical layer consists of 
a longer series of cells than in G. dichotoma, especially in 
the tetrasporic individuals. The filaments of the inner layer 
evidently anastomose. Dr. J. Agardh, to whom I sent this 
plant, in his ‘Beiträge zur Systematik der Algen, considered 
it might belong to his G. fastigiata from the Sandwich Isles. 
G. emarginata, Kuetz., from New Caledonia, appears to be a 
similar plant. 
G. (DICHOTOMA, var. P) ACUTIUSCULA, Grun. (Pl. XII. fig. 5); 
fronde humili, déchotome simili, irregulariter dichotomá, seg- 
mentis ultimis acutiusculis, pulvinatá, subcartilagineá, sepe proli- 
ficationibus lateralibus ereberrimis obsessá ; colore obscure fusco- 
olivaceo. 
Hab. adlitora Japonis (Tanaka, Mus. Vindob. no. 14). 
The plant is about 4 cm. high and 2 mm. broad. Very like 
G. japonica, Grun., but differing in the pointed apices. 
NEMALEON PULVINATUM, Grun. in litt. (Pl. XII. fig. 6); 
fronde pumila, pulvinatá, irregulariter dichotoma, ramosissimá, 
teretiusculá, segmentis patentibus ultimis obtusiuseulis ; colore 
obscure fusco-olivaceo ; fructificatio ? Structuraé Nemalionis. 
Hab. ad litora Japoniæ (Tanaka, no. 13 in Mus. Vindob.). 
This species forms little cushions 13 cm. high, very branched, 
with 1 mm. thick, blackish olive-green, squarrose, dichotomous 
branchlets. The structure is that of Memaleon. 
EXPLANATION OF THE PLATES. 
Puiate VII. 
Fig. la. Codium cylindricum, nat. size. 1). Utricle, magnified. 
2a. Codium divaricatum. 2b. Utricle, magnified. 
3a. Letterstedtia japonica, portion of frond, nat. size, 3b. Vertical 
section of frond, magnified ; 3c, more magnified ; 3d, surface view 
of cells. 
