66 THOUGHTS ON ANIMALCULES. 



stant the stage of the microscope is slightly struck, and 

 as quickly reappear and vibrate its cilia, — and the in- 

 teresting internal phenomena it presents, it is an object 

 of all others the most calculated to arrest the attention, 

 and gratify the curiosity of the general observer, as well 

 as of the accomplished naturalist*. 



The Stephanoceros has a single red ocellus, or eye- 

 speck, in its young state ; and there are near the base of 

 the rotators two minute round bodies at the origin of 

 each arm, (pi. ix, fig. 1, «), that are supposed to be 

 ganglia^ or knots of nervous matter. On each side the 

 body, in every specimen that came under my examina- 

 tion, a dark oval granular mass was observable, (pi. ix, 

 fig. 1, b), which, seen with a high power, appeared to con- 

 sist of corpuscles that were always in tremulous motion. 

 These bodies would sometimes spread out very consi- 

 derably while under view, and the corpuscles were 

 then more distinct and less closely aggregated. These 



* There will be found considerable discrepancy between the descrip- 

 tion in the text, and the figures of Stephanoceros Eichornii given by 

 M. Ehrenberg, and repeated by M. Mandl, {Traite pratique du Mi- 

 croscope. Paris, 1839). The Clapham Stephanoceros is probably either 

 a different species or variety. If it should prove to be specifically dis- 

 tinct from the Prussian Stephanoceros, I would propose to name it -S*. 

 Ehrenhergi, as a tribute of respect to the illustrious philosopher, whose 

 labours have so largely contributed to the advancement of physiological 

 science. 



