1894. ] A New Genus of the Volvocinea. 283 
sexual reproduction by development of one-half to two-thirds 
(50-62%) of the cells into gonidia which retain cilia until 
ready to divide or longer. Diameter of gonidia 2—3 times that 
of vegetative cells. Each daughter plant enclosed within the 
swelled membrane of its mother gonidium until it becomes 
independent; active before escaping; ae cells alike at time of 
escape. Sexual reproduction not kno 
Habitat: Fresh water ditch, Palo Alto, "California, Auta: 
Stanford University, California. 
EXPLANATION OF PLATE XXVII. 
Fig. 1. Typical plant of 120 cells; from a4 cilia diagrammatic and added 
afterward from fixed specimen; X 178.—Fig. Su pears ve sta ages s of division 
of gonidium, front view; a, 2:50 P. M.; 4, clit M.; 115 P. M.; d, vi 
: :40P. M.; nea 10:15 fo ollowing sree! cilia here ioe Gawcoueaies 337. ie 
Fig. 3 her gonidium fro mother plant; lighter c central pines in-: 
neste bali portion of cal eZ x ei obliquity of dividing walls; 2, 2:45 
¥ » 3:25 P. M.; ¢, 3:40 ; d, 4:50 P. M.; X 337.—Fig. 4. ide view of 
icticas gonidium from same mother shdegri a shows only one of two cilia which 
were present in full size and a * @, 2:20 P. M ; 6, 3: ise 13 4:35 P. M., 
30. Foe. 5. “Two reunion ‘al from same plant to show relative size; 
cilia as in Og.°1; xX 337.—Fi ig. wo gonidia = rw to eg 
X 337.—Fig. 7. ica sea show ing erate corpuscle; chromic acid 
1%, and safranin; permanent mo in spt ee x 1,000,—Fig. 8. Vege eta- 
tive cell showing chrom tophore peak nd 2 ing ppresells chromic acid 1%, eae 
hemat toxylin, afte sche stained with alum-cochineal; permanent mount in 
ey erine; X 1,000.—Fi Sia Two gonidia showing pak aly and pyrenais in 
each cell; same s pecimen as fig. 1,000. 
All | drawings ieenchat with an Abbé camera; pyr. = pyrenoid; zu, = = nucleus; 
fig. = pigment s 
