22.2 Shaw: Merrillosphaera africana 207 



gether with a spacing of about 4.5 p. It has not been free more 

 than a short time. The daughter is 105 by 110 p with cells 

 closely packed and spaced about 3.5 p. The number of cells in- 

 dicated is about 3,400. It contains two developed gonidia and 

 some vestigial ones. The gonidia are 50 by 55 p and 48 by 

 52 ft, and their combined diameters reach entirely across the 

 cavity of the daughter, so that the gonidia are in close contact 

 in the center. 



Specimen 48. — This is a mother with two daughters each 

 having two gonidia. The mother is much wider than long, 220 

 by 170 p. The daughters are 120 by 140 p and 115 by 135 p. 

 The gonidia in the daughters are 70 and 75 p in one and 68 by 

 76 and 65 by 70 p in the other. These are the largest gonidia 

 recorded in this paper. 



Specimen 49. — This is a mother with two asexual and one fe- 

 male daughters. The mother is 270 p wide and 240 p long. The 

 daughters are 130 by 140 p. They contain two gonidia in two 

 and twenty-five oogonidia in the other. The dimensions of the 

 gonidia are 60 by 67 and 65 by 70 p in one and 68 by 70 and 

 65 by 67 p in the other daughter. The oogonidia are about 

 16 p wide. In the first daughter one gonidium is dividing, and 

 the other is about to divide as shown by the nuclei. Before di- 

 viding the nucleus moves from the center to the outward side 

 of the gonidium. 



Specimen 50. — This is an asexual coenobium with three daugh- 

 ters; a pair of larger ones that are male and female, and a 

 smaller one that is female. The mother measures 190 by 230 p, 

 the male coenobium 130 by 140 p, and the females 130 by 

 150 p and 90 by 120 p. In the larger female the oogonidia num- 

 ber twenty-seven and measure 18 to 25 p, and in the smaller one 

 there are eighteen oogonidia that measure from 12 to 18 p. In 

 the male coenobium the androgonidia are about 9 to 11 p in 

 diameter, and they are so numerous that they form an almost 

 continuous layer, except in a small area in the front of the 

 coenobium where there are none. The number of the androgo- 

 nidia is about three hundred fifty. 



Specimen 51. — This was selected as an example of a rather 

 small female coenobium. It measures 165 by 190 p in Venetian 

 turpentine and contains fifteen mature oospores. These have a 

 smooth wall 43 p in diameter and apparently about 2.5 p thick. 

 The inner boundary of the wall is not visible in this mounting 

 medium. Within the wall the densely granular part of the 

 protoplast is 29 p in diameter and touches one side of the wall. 



