Marine Algae from Eniwetok — Dawson 
a circulo unico cellulis majoribus 22-30 g 
diametro et in lateribus ambis circulo irregu- 
lari cellulis minoribus angulosis 10-17 /jl 
diametro, internodis 40-70 /jl latis, tetraspo- 
rangiis 35-40 fi diametro verticillatis plerum- 
que tota immersis sub cortice tumidi. 
type: Dawson 14013, growing in a Jania 
turf among rocks near the northern seaward 
reef edge of Rigili Island, Sept. 2. 
This species is distinct in its small size, 
circinate apices, narrow cortical bands less 
than one-half as tall as broad, and in its 
immersed, whorled tetrasporangia. It ap- 
proaches C. mazatlanense Dawson, but differs 
in the cellular arrangement of the cortical 
bands and in the whorled, immersed tetra- 
sporangia. 
Ceramium sympodiale sp. nov. 
Fig. 27 c, d 
Thalli 1 cm. or less in height or extent, 
with main axes 110-130 g in diameter, con- 
sisting of repent or entangled lower parts 
growing amid other small algae in tufts or 
turfs, attached at many places by rhizoids 
from the nodes, giving rise to erect, free parts 
3-4 mm. high; branching sympodial and 
essentially distichous, the branches approx- 
imate above and becoming more widely 
spaced below by elongation of the internodes; 
branches at extreme apices at first more or less 
corymbose and the tips slightly forcipate with 
clearly visible apical cells; cortication incom- 
plete, in narrow bands 35-40 [x wide ( l A the 
diameter of the axis or less), consisting of a 
single ring of larger cells about 30-35 /jl in 
diameter with smaller, angular cells on either 
side; internodes very narrow in upper parts, 
about 10 /d wide, expanding below to as much 
as 170 id ; reproduction not seen. 
Thallis ad 1 cm. latis, axilibus principalibus 
110-130 fd diametro, partibus inferis repenti- 
bus a rhizoideis noduloris affixis, partibus 
solutis 3-4 mm. altis, ramis sympodialibus et 
plerumque distichis ad apices corymbosis, 
apicibus subforcipatis, cortice interrupti vittis 
121 
corticosis nodi 35-40 /d latis a circulo unico 
cellulis majoribus 30-35 /d diametro et in 
lateribus ambis cellulis minoribus anguloris, 
inter nodis supra angustioribus ca. 10 /d latis 
infra latioribus ad 170 /d latis. 
type: Dawson 14014, in clumps of other 
small algae under coral rocks near the north- 
ern edge of the seaward reef of Rigili Island, 
September 2. 
The sympodial, distichous branching and 
very narrow cortical bands are distinctive in 
this small species despite the absence of fertile 
material. 
Ceramium vagahunde sp. nov. 
Fig. lie 
Plants minute, 4-5 mm. high, growing 
among other tufted algae, consisting of a 
creeping, semi-prostrate basal filament pro- 
vided with numerous ventral rhizoids from 
the nodes, giving rise to irregularly and 
sparsely branched erect branches with blunt, 
non-forcipate tips; erect axes 120-140 /d in 
diameter, incompletely corticated, the inter- 
nodes bare for intervals of 30-70 /d in middle 
and lower parts; cortical bands 114-2 times 
as broad as tall, without secondary growth 
above or below, the margins even, especially 
the lower ones, consisting of a narrow inner 
ring of larger cells and on either side of an 
outer ring of irregularly arranged small an- 
gular cells less than 10 fd in maximum diam- 
eter; tetrasporangia cruciate, ovate, about 40 
Id in length, borne verticillately within prom- 
inently swollen involucres which develop 
acropetally from the closely juxtaposed distal 
nodal bands of the erect axes; terminal fertile 
areas to 220-250 fd in diameter, resembling 
those of Equisetum in form. 
Thallis 4-5 mm. altis e filamentis basilaribus 
repentibus a rhizoideis nodularibus affixis et 
ramis sparsis irregularibus erectis apicibus 
obtusis eforcipatis, axilaribus erectis 120-140 
/d diametro, cortice interrupto, vittis corticosis 
nodi lV 2 - 2 -plo latioribus quam longis a cir- 
culo angusto centrali cellulis majoribus et 
