5X2 Philippine Journal of Science 1919 



for a more complete account of the species than has yet been 

 published. 



Another species with megalogonidia and other characters 

 similar to those of Campbellosphaera was described by West 

 ('10) from Albert Nyanza under the name Volvox africanus. 

 This species also has the gonidia differentiated at an early 

 embryonic stage. The original account of this species is suf- 

 ficiently complete to mark it as entirely distinct from Campbello- 

 sphaera, though in form and size of the coenobia it approximates 

 the characters of the latter. 



Several varieties of Volvox africanus are abundant in my 

 «. 



Philippine material, which should serve as a basis for a more 

 complete account of this species also." 



A species of Volvox found by Meyer ('96) in Germany, and 

 called by him V. tertius, resembles Campbellosphaera in having 

 large gonidia, which are probably differentiated early, and in 

 having round somatic protoplasts without protoplasmic connec- 

 tions. Meyer's text figure 7 would serve as well for a diagram 

 of a radial section through the somatic cells of Campbello- 

 sphaera obversa if the outer peripheral membrane, or cuticle, p, 

 were absent, leaving the intercellular spaces, o, continuous with 

 the surrounding space. Volvox tertius appears to be more 

 nearly related to Campbellosphaera than to the older species of 

 Volvox. It is unquestionably distinct from both V. globator 

 Ehrenberg and V. aureus Ehrenberg. Still there is lack of a 

 sufficiently complete description to enable us satisfactorily to 

 assign it to its place among its kindred. 



Some specimens, collected and prepared by Doctor Migula, 

 of Karlsruhe, were described and figured by EKein ('89B) under 

 the name V. aureus, which I believe to have been an incorrect 

 use of the name. Six of the eight coenobia figured (Plate 3, 

 figs. 1 to 3 and 6 to 8) show daughters containing gonidia, 

 gynogonidia, and andrdgonidia, all so large as to indicate plainly 

 that the specimens belong to a megalogonidiate species. It is, 

 therefore, questionable whether the cells that Klein called fer- 

 tilized eggs ("kiirzlich befruchtete Eier") were really such and 



! At the present time, June, 1919, the manuscript is partially prepared 

 of a paper describing at length Volvox carteri and V. africanus and pro- 

 posing for them a new genus to be known as Merrillosphaera. The leading 

 species of this genus will then be; Merrillosphaera carteri (Stein) Shaw 

 (synonyms: Volvox globator Carter non Ehrenberg, V. carteri Stein, V. 

 weismannia Powers) and Merrillosphaera africana (West) Shaw (syno- 

 nym: Volvox afrxcamts West). 



