212 МВ. б. MURRAY ON NEW. SPECIES OF CAULERPA. 
the stalk and surculus having neither of them annulate constrictions, but also in the 
form of the ramenta, which are much shorter and ovate, while those of C. cactoides are 
distinetly club-shaped (Plate LII. figs. 6 & 8, Plate LIII. fig. 1) I have therefore 
given it specific rank as follows :— 
CAULERPA FERGUSONII, n. sp. (Plate LIII. figs. 1 & 2); frondibus a surculo repente 
glabro, continuo erectis difformibus, simplicibus, rhachide inferne tereti, subdistiche 
ramentaceis, ramentis oppositis, ovatis, strictura conspicua а rhachide sejunctis. 
Caulerpa cactoides, var. Fergusonii, Grun. in litt. 
Hab. ad Ceylonam, Ferguson | no. 415. 
This species is most closely allied to C. cactoides on the one hand, and on the other it 
forms a link between this species and C. sedoides, which it resembles in stature, being 
considerably slighter than C. cactoides. At first sight it strongly resembles Montagne's 
figure of his C. corynephora noted above, but a close inspection of this figure shows 
indieations of annulate constrietions of the rhachis, and moreover the form of the leaves 
is distinetly elavate. 
There remains one more species for me to describe, and it is, perhaps, the most 
beautiful of all even of this genus. 
CAULERPA PHYLLAPHLASTON, n. sp. (Plate LIII. figs. 3-6); frondibus a surculo 
repente crasso annulatim subconstricto erectis, ramosis, dichotomis ; ramis elongatis, 
pennatis, distiche ramentaceis ; ramentis regulariter alternis, unilateraliter pinnatis, 
pinnis superis in una serie dispositis, acuminatis, elongatis. 
Hab. ad Progresso, Yucatan, Schott! no. 945. 
I have used the specific name “ phyllaphlaston" in allusion to the stern ornament 
(аФАавсто») of ancient Greek ships, to which the one-sided branching of the ramenta 
bears a strong resemblance. There is no section in the excellent Agardhian arrangement 
of the species of this genus into which C. pAyllaphaston naturally falls. 1% approaches 
most nearly to the sections **Filicoideze" and “ Hippuroidez.” From the former it 
diverges in the ramenta being clothed with ріпше; in the Filicoidee they are the 
ultimate branches. Тһе ramenta of the Hippuroidee bear pinnze, but the rhachis is 
clothed with the ramenta on all sides (е. g. C. Sonderi, Е. Muell.) ; while in C. phylla- 
phlaston the ramenta are distichous and alternate. The species is therefore exactly 
intermediate between these sections, and strikingly unites them. Were it a case 
of genera instead of sections, the proper step would be to permit one or the other to 
disappear; but since it is an affair of the artificial arrangement of species within a genus, 
it promotes no convenience to enlarge the sections, but rather the reverse. I am 
therefore compelled to propose another section called Bipinnate, characterized by 
distichous ramenta, which shall be in turn pinnate—either completely pinnate or 
vnilateral There are from twenty to thirty of these unilateral pinnze on each of the 
primary ріппе in C. phylluphlaston. In the dried specimens the stalks have a reddish- 
