Freshivater Algse and Schizophyeese. By A. W. Bennett. 9 
Mesocarpace®. 
Mesocarpus pleurocarpus DBy., H. 
Staurospermum gracillimum Hass., Beaulieu, H. 
Siphoned. 
■ Vauclieria sessilis Vauch. Wet rock, Buckfastleigh, i). 
Note. 
1 have to add a few words in reference to my previous papers of 
this series. 
Nostoc liyalinum mihi (Journ. K. Micr. Soc., 1886, p. 4, pi. i. 
figs. 2, 8). Bornet and Flahanlt point out that this specific name 
has already been appropriated by iioemer. I propose, therefore, that 
it shall in future be known as N. opalinum Bonn. Those eminent 
algologists think that my species, if distinct, is most nearly allied to 
N. microscopicum Carm. 
Xanthidium spinulosum mihi, tom. cit., p. 10, pi. ii. f. 17. I am 
now convinced that the peculiarities on which I founded this species 
are due merely to a peculiar condition of the gelatinous envelope, and 
that it is simply a form of X faseieidatum Ehrb. The name should 
therefore he abolished. 
Oscillaria princeps Vauch., op. cit., 1887, p. 11, pi. iv. f. 4. On 
the (negative) authority of Cooke’s ‘ British Freshwater Algae,’ this 
species was recorded as new to Britain. Marquand had, however, 
previously observed it in Cornwall (Trans. Penzance Nat. Hist. Soc., 
1885-6) ; and Mr. Eoy informs me that he had gathered it earlier 
than that in three or four places on Deeside, Scotland. It is probably 
not uncommon, at all events in the southern counties. 
Ap)iocystis Brauniana Nag., tom. cit., p. 9, pi. iii. f. 1. This has 
been long known in Aberdeen, according to Boy (m Utt.). Mr. S. 
Le M. Moore has also found it in this country, and has been more 
successful than previous observers in detecting its mode of reproduc- 
tion (Jonrn. Linn. Soc., vol. xxv. p. 362). Mr. West also records it 
from Yorkshire. 
Aphanothece microscopica Nag., tom. cit., p. 10, pi. iii. f. 3. 
Has been familiar to Mr. Boy for many years in the neighbourhood 
of Aberdeen. 
Pediastrum integrum Nag., tom. cit., p. 12, pi. iv. figs. 11-13. 
Occurs in the neighbourhood of Aberdeen, according to Mr. Boy, but 
is rather uncommon. 
Coelastrum cuhicum Nag., tom. cit., p. 13, pi. iv. f. 14. Has been 
gathered repeatedly by Mr. Boy in the neighbourhood of Aberdeen. 
He records also G. microsporum Nag. from the same locality, and 
Mr. West adds a Yorkshire habitat. 
Cosmarium sphericum mihi, tom. cit., p. 17, pi. iv. f. 22. This 
