266 Rhodora [DECEMBER 
GYMNOZYGA Ehrenb. 
G. MONILIFORMIS Ehrenb. (Bambusina Brebissonii Wolle '92). 
Length 25-37 m: maximum breadth 18-25 4, minimum 16-21 p. 
Pudding Pond, North Conway! Intervale! 
Altogether in the two parts of the present paper there are reported 
two hundred and fifty-three species and varieties of Desmids.  Hith- 
erto there were but seventy-four reported from the State, so that one 
hundred and seventy-nine are new records for the State. A consid- 
erable number of the species or varieties were also new to the New 
England list. One thing is very noticeable and that is the confirma- 
tion of the fact that a granitic country or one with old geological 
rocks will give a much greater number of species than one of opposite 
character. In the collection from Pudding Pond, North Conway, 
in spite of the fact that but one collection was made at only one time 
of year there have been identified one hundred and twenty-six spe- 
cies and varieties, exactly one half of the whole number reported 
from all sources from the State. This number might be increased 
by a continued examination of the Pond at other seasons and at 
other parts. Altogether from the small amount of ground covered 
there is every indication that the State of New Hampshire will fur- 
nish a large part of the Desmids that will be reported from New 
England. 
BosroN SOCIETY OF NATURAL HISTORY. 
EXPLANATION OF PLATE 64. 
Figures 4, 10-13, X 400: all others X 550. 
Figure 1. Huastrum crassum (Bréb.) Kütz., var. pulchrum var. nov. 
T Euastrum fissum W. & G. S. West, var. Americanum var. nov. 
Cosmarium claviferum sp. nov. 
Cosmarium obliquum Nordst., var. trigonum West. 
Cosmarium grandiforme Schmidle, var. Amertcanum var. nov. 
6, 7. Cosmartum caelatum Ralfs, var. abnormale var. nov. Fig. 7 
shows connection with the typical form of the species. 
* 8,9. Xanthidium tetracentrotum Wolle. 
10. Xanthidium Bengalicum Turner. 
*" qr. Xanthidium antilopaeum (Bréb.) Kütz., forma curvispinum 
forma nov. 
“ 12. Xanthidium antilopaeum (Bréb.) Kütz., forma callosum forma 
nov. 
* 13. Staurastrum longispinum (Bail.) Arch., var. bidentatum (Wittr.). 
14. Staurastrum pulcherrimum sp. nov. 
“ 15. Staurastrum saltans Josh., var. forcipigerum Lagerh. 
Un OS tS 
