72 
Transactions of the Boijal Society of South Africa. 
Genus TRACHELOMONAS Ehrenberg. 
1. Trachelomonas volvocina, Ehrenb. ; Lemmermaiiii, toe. cit., p. 145, 
fig. 246. 
Sample 22, 30 (common), 69 (very rare), 71 (very rare), 312, and 314. 
Previously recorded from Cape Town (Fritscli). 
2. Trachelomonas ohlonga, Leramermann, loc. cit., p. 147, fig. 278. 
Samples 19 and 29. 
Long., 13 fx; lat., 11 /x. 
Previously recorded from Cape Town (Fritsch). 
3. Trachelomonas cijlinclrica, Ehrenb. (T. euchlora (Ehrenb.), Lemm., 
var. cylindrica (Ehrenb.), Lemmermann, loc. cit., p. 147). (Fig. 29, F.) 
Samples 19, 20, 21, 22, 30 (rather rare). 
Long., 18-20 ^ ; lat., 10-11 /x ; lat. oris, 3-4 /i. 
The elongated tests were somewhat truncated at the front end and 
slightly attenuated towards the back end, with an often wide aperture which 
projected at the most only to a very slight extent (Fig. 29, F). The 
membrane was commonly rather thinner at the back end than elsewhere. 
The sides were not exactly parallel, and hence the reference to T. cylindrica 
must be regarded as somewhat uncertain, although the form seems to come 
nearest to this species. T. cylindrica does not seem to belong to T. euchlora, 
in whicli the collar is apparently always oblique. 
4. Trachelomonas hispida (Perty), Stein ; Lemmermann, loc. cit., p. 149, 
fig. 272. 
Samples 19, 20, 29 (common), 30 (common), 158. 
'YdiY. punctata, Lemmermann, loc. cit., p. 150. 
Samples 19, 20, and 21 (in all three cases rather common), 22. 
Both the type and var. hispida have been previously recorded from the 
Cape (Fritsch) and the type from Madagascar (Fritsch). 
VI. PERIDINEAE (DINOFLAGELLATA). 
Species of Peridinium were encountered in samples 311 and 312, but 
were not present in sufficient numbers for adequate determination. 
