344 DESCRIPTION OF [liotaloria. 



ganglia, in pairs, are visible at the base of the rotatory 

 organ ; young animalcules possess a small glandular dark 

 body internally. 



575. Stephanoceros Eickhornii. Eickhorn's Stepha- 

 noceros, — The case of this creature is transparent, like 

 glass ; its rotatory organ has five lobes or arms, each fur- 

 nished with fifteen verticellate cilii ; these arms it employs 

 as a prehensile instrument occasionally, and spreads them 

 out, as shewn in the engraving. Jig. 383, which represents 

 a full-grown animalcule, with four ova within it ; two have 

 the young developed, which are only expelled when in this 

 state : hence, Dr. Ehrenberg considers this creature vivi- 

 parous. In this figure the eye and gills are visible, and 

 over the latter the ganglia. The case is difficult to be dis- 

 cerned under the microscope, from its very transparent 

 nature, unless indigo is mixed with the water. Length 

 l-36th. 



Genus CXLV. Limnias. — These animalcules have two 

 eyes, a solitary little case (iirceolus), and a rotatory organ, 

 two-lobed when full-grown, being then constricted in the 

 middle ; the apparatus of nutrition consists of a simple 

 alimentary canal, terminating at the base of the tail, a 

 stomach, two jaws with teeth, and two pancreatic glands ; 

 the ova are deposited within the case, and then developed; 

 neither male organs, gills, or vessels, have been discovered ; 

 two visual organs indicate a system of sensation ; these, in 

 the young animalcules, are red, and are even visible within 

 the ovum, but in old age the colour disappears, and hence 

 they are not seen ; in the middle of the rotatory organ, 

 when expanded, are seen four large balls, which Dr. 

 Ehrenberg considers nervous ganglia, or brain. 



