22,2 Shaw: Merrillosphaera africana 201 



in each an abortive gonidium is visible, and there may be another 

 in an obscure part. Between the two posterior daughters, on 

 each side of the mother there is a cell somewhat larger than 

 the somatic cells that may be interpreted as an abortive goni- 

 dium. One is about twice the diameter of a somatic cell and 

 sunken, the other is about one and a half times the diameter 

 of a somatic cell and not sunken. 



Specimen 28. — Plate 5, fig. 32. This specimen is from the 

 same material as the preceding but fixed on the first day men- 

 tioned. It has undergone partial disintegration since being 

 photographed. It contains a pair of larger and a pair of 

 smaller daughters, which in turn contain four gonidia each. 

 The measurements of the gonidia are: 12.5, 13, 11, and 11 /*; 

 13, 13, 12, and 12 p.\ 8.5, 9, 10, and 10 /*; and 8.5, 9, 9.5, and 

 9.5 [i. 



Specimen 29. — Plate 5, fig. 37. From the same pond as the 

 foregoing, about a month later, there came the material that 

 included this specimen. It is very similar to the preceding 

 specimen, but two of its four daughters are female. The asexual 

 daughters contain, in the larger, two 8-celled and two 4-celled 

 embryos ; in the smaller, two 4-celled embryos and one gonidium 

 in its first division and measuring about 46 p. The female 

 coenobia contain twenty-three reproductive bodies of 20 to 25 ^ 

 and twenty-four reproductive bodies of 18 to 23 * respectively. 



Specimen 30.— Plate 5, fig. 33. This specimen and the two 

 following are from the same material as specimen 27 (Plate 

 5, fig. 31). They were on a slide that dried up before notes 

 were taken on the contents of the daughters. Specimen 30, a 

 coenobium of 325 by 360 ^ contains two pairs of daughters, 

 those of one pair somewhat larger (120 by 125 fx) than those 

 of the other (90 by 100 /*). The contents of the daughters 

 seem to be of the same type as of the mother. 



Specimen 31.— Plate 5, fig. 34. This specimen shows a not 

 uncommon combination of three larger and one smaller daugh- 

 ters. It is impossible to decide from the picture whether the 

 smaller body in this case is a daughter or a gonidium. It 

 measures about 50 /*. 



Specimen 32.— Plate 5, fig. 36. This was selected as an 

 example of coenobia having four daughters of nearly the same 

 size. They are plainly arranged in pairs. 



Specimen 33.— Plate 4, fig. 29. This is from the same lot 

 as specimen 28 (Plate 5, fig. 32) and others. The mother is 

 rather mature, and the daughters are backward in development. 



