382 PERCY SLADEN TRUST EXPEDITION. 
This is an intermediate specimen, standing nearer to var. ¢ypica than to var. 
mamillosa f. nuda. 
Var. typica f. denudata, Web. v. Bosse, f. n.; rhachi passim pinnulis orbata, 
pinnulis parvis. 
Cargados Carajos [depth unknown ; probably about 30 fms.]. Farquhar Lagoon. 
The main axis is in many parts bare of pinnules, and the pinnules where present are 
small. In the dried specimens the axis is a little constricted above a whorl of pinnules. 
This is, however, not always the case, and may be due to the drying process. 
Var. typica f. Gardineri, Web. v. Bosse, f.n. (Plates 47, 48. figs. 12,13); frondibus 
a surculo repente erectis elongatis dichotome ramosis fastigiatis, vel planis pro 
specie latis (1°5-2 mim.) pinnulas distichas gerentibus, vel triangularibus pinnulas 
regulares tristrichas breves subnaviculares gerentibus. 
Saya de Malha, 25 fms, Cargados Carajos, 28 and 45 fms. 
The form Gardineri is another instance of the difficulty of distinguishing definitely 
the members of Caulerpa cupressoides. Some months ago I received from my friends 
Mr. and Mrs. Gepp a small collection of Mr. Stanley Gardiner’s Caulerpe, and among 
these I found the above-named form, but only with branches bearing distichous 
pinuules (fig. 12). These plants were dried specimens, and bore no indication of the 
depth at which they had been collected. The rather broad axis and the distichous 
pinnules pointed towards C. Lessonii, Bory, but the entire absence of cylindrical 
pinnules, the great length (20 cm. and more) of the branches, or ‘‘assimilators” as 
Svedelius calls them, made me think that this plant was a deep-water form of 
C. cupressoides. 
A short time ago I received from Mr. and Mrs. Gepp some more Caulerpe from the 
same collection for determination. This time the material was preserved in alcohol, 
and amongst it was this same form Gardineri. On the accompanying label was 
mentioned the depth from which the alga had been hauled up; it was 28 fathoms, 
Amongst these specimens there was one large plant with triangular regularly tri- 
stichous pinnules, all subnavicular (fig. 13). We know, and Svedelius in his beautiful 
paper on the Caulerpe of Ceylon has described the fact at full length, that some species 
of Caulerpe increase in length when they grow in places where the water is deep, and 
that other species do not, C. cupressoides seems to belong to the first category; but 
with the lengthening of the main axis we observe a reduction of the pinnules in size 
and often in number. The pinnules of the form Gardineri are smaller than the 
pinnules of C. cupressoides var. typica, and they are often distichous instead of tri- 
stichous, but specimens with tristichous pinnules do occur. The present form is new 
to science, and I have given it the name of Gardineri, in honour of Mr. Stanley Gardiner 
who collected it for the first time. Its characteristics are the great length of the 
assimilators and the regular, rather small, subnayicular pinnules, placed either 
distichously (fig. 12) along a rather broad, or tristichously (fig. 13) along a triangular, 
axis. 
