ALG OF MAURITIUS. 155 
In height and mode of growth it resembles Z. but is 
far more robust and with compressed stems. 
14. Chondrus multipartitus, 8. foliifer, Grev. Sph. multi- 
partitus, Ag. Syst. 216. Fucus sruginosus, Turn. T. 147. 
(admirable.) This variety appears to abound in the Mauri- 
tius. 
15. Corallopsis?—I find in the collection a solitary im- 
perfect specimen of a plant which may belong to this genus; 
but I dare not describe it as a new species, without some 
more certain data. "The stem is slightly branched, irregu- 
larly dichotomous, 1 inch in diameter at the thickest part, 
articulated at various distances, the articulations much con- 
tracted at their insertion and swollen upwards. Colour 
purplish. Substance coriaceo-membranaceous. 
SIPHONE.E.* 
16. Caulerpa clavifera, Ag. Syst. 181. Fucus clavifer, 
Turn, t. 57. 
17. Caulerpa sedoides, Ag. Syst. 182. F. sedoides, Turn. 
E172. 
18. Codium adherens. Ag. Syst. 178. 
Specimens agreeing with Agardh’s description of this 
supposed species, occur in the collection; but I really do 
not see how they are to be distinguished from the young 
state of Codium tomentosum, which, as is well known, is ** plane 
and encrusting." 
ULVACE. 
19. Ulva latissima, Ag. Syst. p. 188. U. Lactuca. E. Bot. - 
t. 1551. 
* Dr. Greville, in his excellent arrangement of tlie Genera of the Alge, 
has made Caulerpa the type of a distinct family, “ Caulerpee;” but the 
structure and substance of this curious genus appear to me so truly anala- 
gous to those of Codium and Vaucheria, that I have ventured to refer it 
to the “ Siphoneg."—W. H. H. 
