188 The Philippine Journal of Science 192s 



are located on opposite sides a little in advance of the middle 

 of the daughter. There are three granddaughters in the other 

 larger daughter and two in the smaller daughter; but, some 

 of them being out of focus, their relative sizes do not show. 

 In figure 9 (Plate 7, fig. 50) one of the daughters is clearly 

 shown to contain four granddaughters and the others appear to 

 contain the same number, all of which have diameters one-eighth 

 or less of the dimensions of their mothers. The granddaughters 

 in figure 10 (Plate 7, fig. 48) are four and three in the paired 

 daughters, and four in the smaller daughter. The clearest 

 picture of the fourth generation is one in the right member of 

 the pair in the same figure, the globose granddaughter being 

 about 65 fi in diameter, and the fourth generation, whether goni- 

 dia or embryos, about 12 fi in diameter. 



The tendency to have the daughters grouped into a larger 

 pair in the middle of the mother and a smaller pair farther 

 back is probably more marked in the species than appears in 

 the photomicrographs, and I believe that it may properly be 

 regarded as a character of the species represented by the figures. 

 West ('10) recorded having observed coenobia in which only a 

 single daughter was present, and stated that in such cases the 

 daughters were ovoid although free from compression by sisters. 



A male coenobium observed by West ('10) in company with 

 the asexual coenobia presented no means by which it could cer- 

 tainly be identified as of the same species. The material con- 

 tained no female coenobia. 



FEMALE COENOBIA FROM AFRICA 



Female coenobia of this species were found in plankton 

 material collected by Dr. A. W. Jakubski, of Lemberg, from 

 small temporary pools in the Ussangu Desert, in what was then 

 German East Africa, on his trip of 1909-10. Mr. C. F. Rous- 

 selet ('14), who discovered them, turned them over to West 

 for description. In describing them West ('18) gave photo- 

 micrographs figures of two female coenobia with ripe oospores. 

 These figures are reproduced herewith (Plate 7, figs. 51 and 52) . 



These coenobia are ovoid-ellipsoidal, and measure about 565 

 by 660 ^ and 600 by 780 p.. Oospores are absent from the 

 anterior fifth of the coenobium, and the number of oospores in 

 each coenobium appears to be about 40 (39 and 41). West 

 ('18) gave 70 to 80 (average 74) as the number of oospores 

 lobium. The number of cells in a coenobium he stated 

 to 8,000 and the number of daughter coenobia as 1 



