HAZEN: NEW SPECIES OF LOBOMONAS 127 
a certain degree of differentiation. The conjugation of this species 
presents a close parallel to that described by Goroschankin for 
Chlamydomonas reticulata (5, p. 126, pl. 3, f. 6-8). He states 
that the gametes show little difference in size, and that they 
sometimes simultaneously slip out of their walls; but more 
frequently, after the beginning of conjugation, one of the gametes 
first throws off its wall and takes on a globose form, then the 
second does Jikewise, and then the two rounded masses go on to 
complete fusion. 
The subjoined Latin diagnosis ceaiants the chief character- 
istics oe this species: 
monas pentagonia sp. nov. L. cellulis vegetativis minu- 
tis, seer erag S latere aspectata forma aliquanto pentagonia 
sed angulis rotundatis (verrucis) haud omnibus in eodem plano 
a vertice aspectata rotundata cum 5-8 verrucis, aliis anterioribus, 
chromatophoro excavato, pyrenoidem unum sublateralem port- 
ante, et parte eacavata nucleum lateralem includente; 
stigmate bacilliformi paululum ante mediam cellulam sito; 
vacuolis contractilibus es in rostello Spoplemacn positis. 
Propagatio fit 2 aut 4 zsooporis intra ce ellulae matricalis 
membranam ortis, divisione priore visa quasi ee eps 
propter ibe ng rotationem sed vero longitudina 
o fit gametis parvulis, vel subaequalibus a aliquan- 
to paiva membrana tenuissima vestitis, inter se binatim 
copulantibus. 
Longit. cell. veg. 10-13 uw; lat. 9-10 wu. Longit. gametarum 
- ca. 8 ys; lat. 4-5 uw; longit. ciliorum ca. I 
Hab. in stagni margine. Ham Consnen, Surrey, England, 
1-7 Aug. 1920 
Lobomonas rostrata sp. nov. 
This form, the first representative of the genus to be reported 
in America, at first sight appeared very similar to L. Francei 
Dangeard (3, p. 115), but careful study disclosed differences as 
important ds those which distinguish most species of Chlamy- 
domonas, so that I feel obliged to regard it as a new species. I 
first found a few individuals in examining a collection of Gonium 
pectorale and an undetermined species of Chlamydomonas, ob- 
tained the last of September, 1919, from a rain-water pool o 
a highway in the southern part of Englewood, New Jersey. Lat- 
er it was interesting to discover that the species had been collect- 
