BY G. I. PLAYPAIR. 337 



form between the two genera Pandor na and Eudorina, especially 

 since the oval form of Eudorina (very rare here) was found in 

 company with P. morum var tropica in the same gathering (both 

 in profusion). 



Genus Eudorina Ehr. 

 Eudorina elegans Ehr. 



Ccien. ovale, long. 110-128, lat. 95-110, cell. diam. 20-22 /x. Ccen. 

 sphaeric. diam. ad 100 /a. 



Lismore (223, 241, 242, 249, 260). 



Eudorhia elegans here is generally spherical. In sample No. 

 242, however, the oval form was present in company with P. 

 morum var. tropica, supra, and showing a great likeness to it. 

 The cells were certainly globose, but were arranged (7-j-10-(-7) 

 in three planes imrallel to the long axis of the coenobium (as in 

 Pandoynna)^ not across the axis as shown by Chodat, I.e., p. 151, 

 f.76A. 



VoLVULiNA, gen.nov. 



Character idem ac speciei, 



VoLVULiNA Steinii, n.sp, (PI. xliii., f.3, 4.) 



Ccenobium sphjericum vel ovale, cavum, Volvoci simillimum; 

 integumento tenui, hyalino, membranaceo (ut videtur) nee 

 mucoso; intus cellulis aequaliter dispersis, integumento adhserent- 

 ibus instructum; cellulis tholiformibus magnis, a vertice circu- 

 latis, a latere semicirculatis vel rotundato-conicis, fronte planis, 

 postice rotundatis; stigmate rubro distincto juxta flagella posito; 

 flagHllis distinctis 2 quam in Volvoce vel in Eudorina paullo 

 latius inter se distantibus; vesiculis contractilibus aliquot (3 visis) 

 circa marginem anteriorem dispositis. Cytoplasma densum, 

 granulosum; endochromate dilute viridi in orranulis minutis ut 

 videtur disperso; chloroplastidibus nullis distinctis nee pyrenoi- 

 dibus. 



Coenob. sphser. diam. 50-58; cell. diam. 10-15, alt. 8-12 [x. 



Lismore(244, 246). 



Eudorina elegans Stein (non Ehr.), I.e., T. xvi., f.8. Ob- 

 tained in abundance on June 26th, 1914, (winter) from rainwater 

 pools on grassland (once a swamp, I am told) alongside the Drill 



10 



i 



Vi 



p. 



