2 Shaw: Merrillosphaera africana 217 



Plate 6 



. 39. An asexual coenobium of an 8-gonidiate form of Merrillosphaera 

 africana, as are those of the three following figures. These 

 are all mounted in Venetian turpentine. This coenobium con- 

 tains six daughters, and in all of them the only developing 

 reproductive bodies are two gonidia that are in different daugh- 

 ters. Specimen 39. x 100. 



40. An asexual coenobium of the same form as that of the preceding 



figure. It contains six daughters in pairs, and an odd young 

 embryo. The daughters contain only gonidia. Those in the 

 larger daughters are 53 to 58 m wide. Specimen 40. x 100. 



41. An asexual coenobium of the same form as that of the two pre- 



ceding figures. It contains six daughters and two embryos of 

 about one hundred sixteen cells each. In the largest daughters 

 there are six and five gonidia; in each of the others four. 

 Specimen 41. X 100. 



42. An asexual coenobium of the same form as that of the four pre- 



ceding figures. It contains six daughters. One large daughter 

 contains six, the other large one and a smaller one each five, and 

 the other smaller daughters each four gonidia. Specimen 42. 

 X 100. 



43. A sexual coenobium of a small form of the species in Venetian 



turpentine. It is from the same source as those of the two 

 following figures, and they are all mounted in the same medium. 

 It contains about twenty oospores of 35 to 39 m diameter. Spec- 

 imen 43. X 100. 



44. An asexual coenobium from the same source as that of the pre- 



ceding and following figures. It is considerably shrunken by 

 the process of mounting in Venetian turpentine. It contains 

 two daughters, each with two gonidia. Specimen 44. X 100. 



45. Another asexual coenobium from the same lot. It contains two 



daughters, each with two robust and one or two vestigial gonidia. 

 Specimen 45. X 100. 



46. An immature bisexual coenobium of the typical 4-gonidiate ovoid 



form of the species shown by Plate 1 and Plate 2, figs. 7 and 9 

 to 12, inclusive. It measures 410 by 515 m. The reproductive 

 bodies are thirty-two oogonidia about 37 ^ in diameter and an 

 antheridium, a little to the left of and above the center, con- 

 sisting of a sperm platelet. Specimen 14. X 100. 



47. The most mature of all the bisexual coenobia that are figured in 



these plates. It measures in the picture 515 by 620 m. It is 

 greatly compressed under the cover glass, and its dimensions 

 before compression were probably nearer 500 by 600 m. In it 

 there are twenty-seven oospores. They have smooth walls about 

 43 n in outside diameter and 37 m in inside diameter. There are 

 three antheridial sites; two at the middle level on opposite sides 

 of the coenobium, and another in the back part of the coenobium. 

 Specimen 15. X 100. 



