VOLVOCINES, 67 
The author cited then goes on to explain how he conceives the other 
stages of the Hudorina are passed, which he had not the opportunity 
of observing. The whole memoir is one of great interest, and will 
well repay perusal by those who are investigating this subject. 
Eudorina elegans. Ehrb, Monats. Berl., 1831, p. 78. 
Cenobia oval, cells usually 32, globose, either scattered or 
quaternate, eight at each pole, distributed in three parallel 
circles, at equal distances from each other, around the periphery 
of the coenobium. 
Size. Coenobium ‘04-15 mm. long. Cells :018--022 mm. 
diam. 
Rabh. Alg. Eur. iii. 99. Ehrb. Infus. 63, t. iii. Pritchard 
Tnfus. p. 520. Carter, in Ann. Nat. Hist., Oct., 1858. 
Pandorina elegans, Dujard. Zoophy., p. 317. 
In standing water. 
Formerly found at Hackney and Hampstead, most abundant in the 
spving of the year, but doubtless quite extinct at both places. ‘ Clusters 
are often seen,” says Pritchard, ‘‘in such amazing numbers along with 
Volvow and Chlamydomonas pulvisculus as to render the water of a 
decided green colcur, especially towards the edges.” 
Plate XXVI. fig. 1. a, 16-celled family; 2, sixteen-celled family 
dividing into a 32-celled family ; 3, part of a family, showing division in 
pairs; 4, 32-celled family divided into daughter-families; 5, one-celled 
daughter-family. All after Stein. 6, colony with three spermatic 
cells, having burst; 7, spermatic cells x 400; 8, spermatic cell X 800 ; 
9, spermatozoids x 800. After Carter. 
Genus 41. PANDORINA, Zhrd. (1830.) 
Ceenobium globose or subglobose, invested by a broad colour- 
less hyaline tegument ; cells green, granulose, globose (16, 32, 
or 64), included within a single rather thick membrane, bearing 
two vibrating cilia, with or without a red spot, aggregated in a 
botryoid manner. 
Propagation the same as in Hudorina. 
Henfrey’s emended character of this genus was in the following 
terms :—‘‘ Frond a microscopic, ellipsoidal, gelatinous mass, containing, 
embedded near the periphery, sixteen or more biciliated, permanently 
active gonidia, arranged in several circles perpendicular to the long axis 
of the frond. The gonidia almost globose, with a short beak-like 
process, a red spot, and a pair of cilia which project through the 
substance of the frond to form locomotive organs upon its surface. 
Reproduction—I., by the conversion of each gonidium into a new frond 
within the parent mass; II., by the conversion of the gonidia into 
encysted resting spores, which are set free and (?) subsequently ger- 
minate to produce new fronds.”— Quart. Micro. Journ. (1856), p. 49. 
