21,1 Shaw: Merrillosphaera 121 
of the coenobium. Oogonidia about 14 » in diameter in coeno- 
bia of about 175 » diameter at time of birth. Oospores about 
50 w in diameter; with very slightly wavy wall about 2.5 to 3 ph 
thick; with eccentric protoplast about 37 » wide. 
Habitat.—Fresh-water pools, near Manila, Philippine Islands 
(leg. W. R. Shaw 1914).** 
MERRILLOSPHAERA CARTERI (Stein) Shaw var. WEISMANNIA 
(Powers) comb. nov. 
Volvox weismannia Powers in Trans. Am. Microscop. Soc. 28 (1908) 
141-175, pls. 24-26, figs. 25, 27-61. 
Coenobia spherical or nearly so; asexual reaching at maturity 
664 by 672 »; at time of segmentation of the gonidia 350 to 400 p. 
Mature females not described. Male coenobia about 210 » in 
diameter. Somatic cells 2,500 to 7,500; form and size not 
stated ; intercellular distances not given, but greatest at anterior 
‘pole and grading to about half as great at the posterior pole. 
Gonidia 8 to 12, most commonly 10; differentiated at the 64- 
celled or the next stage, reaching 25 » before the birth of the 
coenobium containing them and 90 » (the largest figured was 
65 ») before segmentation. Gonidia arranged regularly in two 
quartets, without or with an additional pair or quartet of smaller 
ones from which members may be absent; occupying the pos- 
terior three-fifths of the coenobium. Female coenobia described 
only in very young stages within their mothers. Oogonia dif- 
ferentiated at an early embryonic stage; twice as numerous (16 
to 20) as the gonidia. Male progeny in parental coenobia 1 
to 10; before birth about equal in size to their asexual sisters. 
Androgonidia more numerous than oogonidia; scattered around 
the internal periphery of the male coenobia segmenting into 
antheridia and forming tabloid bundles of 64 and 128 sperms 
that ripen before the birth of the coenobia containing them. 
Spermatozoids slender, with terminal cilia. Oospores not de- 
scribed. 
Habitat.—A broad, shallow pond near Rocheport, Missouri, 
North America (leg. Wolcott, 1904). 
“Slide mounts of material of this species from the vicinity of Manila 
have been sent to Prof. Frank G. Haughwout, Bureau of Science, Manila, and 
to Prof. Douglas H. Campbell, Stanford University, California. Material 
bottled in glycerine has been sent to sixteen biologists in America and 
to sixteen in Europe and Asia. Duplicates of this bottled material are 
available for distribution from my American address: Claremont, Cali- 
fornia.—W. R. S. 
