144 M. E. Penard's Notes on some Heliozoa. 



From this analysis we see that B. orientalis, although 

 intermediate between B. igneus and B. pachypus t is on the 

 whole nearer the latter. So far as we know, the enormous 

 area separating the habitats of B. igneus* and B. orientalis 

 does not seem to be tenanted by any form of the genus Bom- 

 binator or any other Diseoglossoid. 



C A UD AT A. 



19. Salamandrella Keyserlingii. 



Dybowski, Verli. zool.-bot. Ges. Wien, 1870, p. 237, pi. vii. 

 Isodactylium Schrenckii, Strauch, Salam. p. .56, pi. ii. fig. 1. 



Lake Baikal, Schilka and Ussuri Rivers. Specimens from 

 Chabarowka are in Hr. Dorries's collection. 



20. Oeomolge Fischeri. 



Bouleng. P. Z. S. 1886, p. 416, pi. xxxix. fig. 2. 



The only specimens known of this very remarkable Sala- 

 mandroid are the two types obtained by Hr. Dorries at 

 Chabarowka. 



XVIII. — Notes on some Heliozoa. By M. Eug. PENARDf. 



The Heliozoa are most frequently met with in the fresh water 

 of pools, peat-mosses, and brooks. Although these organisms 

 were observed during the last century (Joblot, O. F. Muller, 

 Eichhorn) it is only within about thirty years that they have 

 been well known. Classed for a long time with the Infu- 

 soria, they were grouped by Hackel in 1866 into a special 

 subclass. By their particularly elegant forms and their whole 

 organization the Heliozoa, by showing us to what degree of 

 differentiation a simple Rhizopod may attain, fully deserve 

 the interest which has attached to them, and it is to them that 

 I would for a moment call attention. 



These animals are in reality only Rhizopods; but while in 



* Not recorded east of the Ural. B. pachypus, which inhabits the 

 plain in the west of Europe, appears to be exclusively a hill-form in the 

 east ; it is not known from Russia. 



t Communicated to the Societe de Physique et d'Histoire Naturelle de 

 Geneve, 3rd October, 1889; Bibl. Univ., 'Archives des Sciences Physiques 

 et Naturelles,' tome xxii. pp. 523-539. 



