590 RECORD OF CURRENT RESEARCHES RELATING TO 



tlie body by a clear band in the endosarc. Tbe nucleus divides in 

 two, a constriction contracts the body at tlie point of segmentation, 

 and tlie vessel becomes divided into two. The two segments remain 

 united together. The same operation is repeated, for a first time, at 

 the middle of each of the segments, so that we see four segments sol- 

 dered together, then a second time at the middle of each of these four 

 new segments, and the body is cut into eight segments still attached 

 to one another, and completely recalling by their external aspect and 

 arrangement the zoonites of the Tteniaj. These segments then sepa- 

 rate, and many of them are always found isolated in the rectum of the 

 hosts. 



This fine Infusor much resembles the Opalinid found by Von 

 Siebold in Planaria torva, and figured by Max Schultze under the 

 name of Opalina polymorpha. If we adopt the generic divisions esta- 

 blished in the family of Opalinida by Stein, it will have to be j^laced 

 by the side of this latter species in the genus Haptophrya. On account 

 of its large size, M. Maupas names it H. gigantea. 



Stem's ' Organismus der Infusionsthiere.' * — After an interval of 

 eleven yeai's, the first part of the third volume (comprising the Flagel- 

 late Infusoria) of this work has appeared. It is the result of long and 

 patient original investigation, and constitutes, as the author says, the 

 most laborious of his productions. The second part, containing the 

 characters of the genera and description of the species, is announced 

 as shortly to follow, completing the work. 



The following is the classification adopted by Stein for Infusoria 

 which move by means of flagelliform filaments. It will be seen that, 

 returning to the traditions of Ehrenberg and of his school, he brings 

 back to the animal kingdom a number of organisms that most modern 

 authors consider as of a vegetable nature. 



Infusoria Flagellata. 



1. Monadina. 



Cercomonas ; Monas ; Goniomonas ; Bodo ; Phyllomitus ; 

 Tetramitris ; Trepomonfis ; Hexamita ; Lophomonas ; and 

 Platytheca. 



2. Dendromonadina. 



Dendromonas; Cephalothamnium ; Anthophysa. 



3. Sjjongomonadina. 



Ciadomonas ; Ehipidodendron ; Spongomonas ; Phalansterium . 



4. Craspedomonadina. 



Codonosiga ; Codonocladium ; Codouodesmus ; Salpiugoeca. 



5. Bikoecida. 



Bikoeca ; Poteriodendron. 



6. Dinohryina. 



Epipyxis ; Dinobryon. 



7. Crysomonadina. 



Coelomonas ; Ehaphidomonas ; Microglena ; Chrysomonas ; 

 Uroglena ; Syncrypta ; Synura ; Hymenomonas ; Stylo- 

 chrysalis ; Chrysopyxis. 



* M. J. Deby in ' Bull. Soc. Belg. Micr.,' v. (1879) p. 99. 



