INFUSORIA. 53 



ORDER IV. Epitricha. 



Animalcules moving by means of vibratile cilia. 

 Section I. Astoma 1 . 



Family IX. Peridincea. Loricated, with a coronet, or a trans- 

 verse belt of cilia. 



Peridinium EHRENB. (Species of Cercaria MUELL.) 



Sp. Peridinium tripos EHEENB. (Cercaria tripos MUELL., Infus. Tab. xix. 

 fig. 22 ; EHRENB., Infusionsth. Tab. xxn. fig. xvm. ; the lorica terminates 

 in three points ; two anterior curved backwards, and one posterior, 

 which is straight. The animacule attains a length of ^Hne ; it is found in 

 the Baltic. 



MICHAELIS observed a phosphorescence in this and some other species of 

 this genus, and thus proved, what had been suspected before, that Infu- 

 sories contribute to the illumination of the sea. Ueber das Leuchten der 

 Ostsee, Hamburg, 1830; comp. EHEENBEEG, Das Leuchten des Meeres. Ein 

 in der Konigl. Akademie der Wissenschaften yehaltener Vortrag. Berlin, 

 1835, 4to. 



To this genus also probably belong as fossil species some organic 

 remains which EHBENBEEG discovered in the chalk-formation in fire- 

 stones. 



DinopJiysis EHRENB. (Abhandl. d. Konigl. Akad. d. Wiss. zu 

 Berlin, a. d. Jahre 1839, s. 124.) 



Section II. Stomatoda. (Animalcules with mouth and oeso- 

 phagus leading into the parenchyme of the body. One or more 

 round, contractile cavities, pulsating rhythmically, situated beneath 

 the integument at the surface of the body.) 



Family X. Trichodina (Trachelina and Colpodea EHRENB.) 

 Body oval, with vibratile cilia, without cirri or styli, not loricated. 



Trichoda MUELL. (in part, TricJioda DUJARD. and Trachelius 

 SCHRANK, EHRENB., DUJARD.) An oblique row of large cilia at 

 the mouth, 



Phialina BORY, EHRENB. 



1 I consider this description as merely provisional. As to the presence of a mouth 

 in particular genera of Infusories much variety of opinion exists, and that the point 

 is not easy to determine will be obvious to every one who observes for himself. This 

 character, then, in the present state of our knowledge, scarcely deserves a prominent 

 position. [Vid. note I, p. 39.] 



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