220 



well known, and their specific distinction clearly established. In 

 this connection the work of Klein (1889), Overton (1889), and 

 Hick (1891) was mentioned. The distinguishing features of the 

 two species are for the most part in the sexual organs and ripe 

 oospores, although each species can be definitely recognised by 

 the structure of the vegetative colony. In both species the vegeta- 

 tive (asexual) colonies are globular, and the male colonies ovoid ; 

 but in F.^^o^a^or the female colonies are almost invariably globose, 

 while in V. aureus they may occasionally be ovoid. There is a 

 third European species, V. tertiiis (A. Meyer, 1896), which is less 

 well known, and can only be regarded as doubtfully distinct. In 

 this species there are no connecting strands between the cells of 

 the adult colony. J. H. Powers in America has recently (1905 

 1906) described several new forms under the names of V. sperma- 

 tosphaera, V. Weisrtiminia and V. perglohator. The paper then 

 described two new forms of Volvox. The first, Volvox Rousseleti^ 

 was collected in September 1905, at Gwaai, in Rhodesia, by Mr. 

 C. F. E-ousselet. The second form was Volvox africanus, obtained 

 from the Albert Nyanza by Mr. R. T. Leiper in July 1907. When 

 the material was first examined, the form was recorded as F. 

 aureus; but Prof. West said that since then he had examined 

 many more specimens, and had found constant characters not in 

 keeping with those of V. aureus. The colonies are of approxi- 

 mately the same size as V. aureus, but differ in being con- 

 stantly ovoid or egg-shaped, and in the nature of the daughter 

 colonies. 



Several preparations of Volvox, including the two new species,, 

 were exhibited by Mr. Rousselet. 



The President said this communication by Prof. West was 

 a very valuable one and would doubtless be read with much 

 interest when it appeared in the pages of the Journal. Volvox 

 had been claimed by both zoologist and botanist, each making 

 use of it as a type illustrating a certain grade of evolution and 

 regarding it as their own and looking upon the other as a bore. 

 They were very much indebted to Prof. West, and to Mr. C. F. 

 Rousselet for reading the paper. 



A hearty vote of thanks was accorded Prof. G. S. West for his^ 

 interesting paper. 



A paper on " Two New Species of Cassidulina," by Mr. Henry 

 Sidebottom, was read by Mr. A. Earland. As introduction tO' 



