21, 2 Shaw: Copelandosphaera 223 
DIAGNOSES OF GENUS AND SPECIES 
Genus COPELANDOSPHAERA novum 
(Volvocaceae, Volvoceae) 
Body a spherical or ellipsoidal coenobium of biciliate cells 
that contain chloroplasts. The cells appear to lie in the periph- 
ery of a gelatinous matrix surrounded by a hyaline envelope 
through which the cilia protrude. Somatic protoplasts globose 
or ovoid, each inclosed in a thick gelatinous membrane that 
is more or less prismatic in form. No protoplasmic \filaments 
connecting the protoplasts. Asexual reproduction by gonidia 
that are differentiated in late embryonic stages of the coenobia 
producing them. The gonidia develop to relatively moderate — 
size before segmentation. Oogonidia and androgonidia in the 
same coenobia with gonidia or in sexual coenobia. Antheridia 
consisting of sperm platelets or of sperm spheres compounded of 
sperm platelets. Spermatozoids with terminal cilia. 
The type species of this genus is the new species Copelando- 
sphaera dissipatriz, described herewith from the Philippine 
Islands. One other species takes a place in this genus; namely, 
Volvox spermatosphara Powers, which was described from 
western North America. The diagnosis of that species given 
herewith is a revision of Powers’s original definition and is made 
in accord with the details of his description and figures. 
COPELANDOSPHAERA DISSIPATRIX sp. nov. Plates 1 to 4. 
Coenobia spherical or ellipsoidal; asexual 1,000 w, More or 
less (2,250 » recorded), about 300 by 350 p at birth; sexual 
620 by 660 », more or less (973 recorded). Number of cells 
usually between 9,000 and 25,000 (52,600 recorded). Proto- 
plasts globose to ellipsoidal, about 4 by 5 » to 5 by 6 p in 
diameter; about 3 » wide at time of birth; spaced 8 to 20 p 
apart (center to center). Stigmata large in cells about the 
anterior pole, gradually decreasing in size backward. Repro- 
ductive cells confined to the posterior half, three-fifths, or three- 
fourths of the coenobia. Gonidia in asexual coenobia; 4 to 15; 
not arranged in pairs or fours; differentiated at about the 
stage before the last two or three growth divisions; reaching 
about 20 to 22 » and segmenting to produce embryos that are 
8- to 16-celled by the time of birth or segmenting after birth. 
Early stages of embryos globose; later embryonic stages oblate; 
daughters becoming prolate before birth. Oogonidia and andro- 
