OF THE THIRD TANGANYIKA EXPEDITION, 145 
This Alga requires further investigation. The tough membrane which 
encloses the families of cells, and irregular lobes and strands of which hold 
the colonies together, seems to distinguish it from Botryococcus Braunii. 
It may, however, be only a state of that Alga. All the specimens from 
Victoria Nyanza had the prickly appearance which is often one of the 
peculiarities of /neffigiata (vide W. & G. 5. West, in Journ. Bot. xli. (1903) 
t. 447. fig. 3), the tough outer membrane being densely covered with irregular 
spines and spinous processes. 
Family PALMELLACEZ. 
Genus PALMOPHYLLUM, Кі, 
184. PALMOPHYLLUM FOLIACEUM, sp. п. (PI. B. fig. 10.) 
Thallus minutus, cartilagineus, suberassus, foliaceo-lobatus, basin an- 
gustiorem fixus, sine lineis concentricis, lobis sinuatis ; cellulis minutissimis, 
confertissimis, in lineis longitudinaliter dispositis, oblongis vel oblongo- 
ellipticis, viridibus. Cellularum divisio in unam directionem. 
Long. thall. 250-330 ш; lat. max. thall. 140—320 ш; long. cell. 2:2-3:4 ш; 
lat. cell. 1:3-1:6 р. 
Tanganyika.—On stones, dredged in a few fathoms, Niamkolo ; among 
Cladophora inconspicua in the hollows of a calcareous incrustation. 
This species is distinguished from Р. erassum, (Масс.) Rabenh. (=P. 
flabellatum, Kiitz.) by the smaller size of the thallus, which is destitute of the 
zones of concentric lines, and by the minute cells. The thallus is expanded 
from a narrow base and is of uneven thickness. It is of a dark green colour, 
lobed and sinuate at the margin, and sometimes deeply cleft. The nature 
of the chloroplast could not be determined from the preserved (dried) 
material. 
SPHINCTOSIPHON, gen. n. 
Cellule: in tegumentis tubulosis conferte et irregulariter aggregate ; 
tegumentis gelatinosis, achrois, tubulosis, firmis et lamellosis, lamellis externis 
sepe diffluentibus ; cellule globose, cum chromatophora singula parietali 
læte viridi et valde granulosa ; membrana cellularum tenuissima ; tegumentis 
junioribus subrotundatis vel irregulariter lobatis, iis vetustis elongatis, siphoni- 
formibus, curvatis, hine inde ligatis. Propagatio divisione tegumentorum 
lobatorum juniorum in omnes directiones. 
185. SPHINCTOSIPHON POLYMORPHUS, sp. unica. (Pl. 3. fig. 12; Pl. 5. 
figs. 11-13.) 
Character idem ac generis. Tegumentis adultis irregulariter cylindricis, 
vermiformibus, nunquam ramosis, sepe in articulis elongatis constrictis vel 
subconstrictis. 
LINN. JOURN.—BOTANY, VOL, XXXVIII. L 
