Floscularia.'] TH E INFUSORIA. 345 



576. LIMN i AS ceratophiili. The hornwort Limnias. 

 Case white at first, afterwards brown, or blackish ; it is 

 smooth, but, being viscid, is often covered with extraneous 

 particles, its connexion with the animalcule is a voluntary 

 act of the latter ; the two red eyes and the jaws may be ob- 

 served in the ova, when developed, and by giving them a 

 gentle pressure the shell bursts. Fig. 389 exhibits an 

 animalcule just emerged from the egg, 392. Fig. 391 is a 

 young specimen, with the rotatory organ nearly circular ; it 

 also shews the two eyes. Fig. 390 is a full-grown specimen, 

 without its case, fed on indigo, the jaws (each of which 

 has three strong teeth), the ova, and traces of two (four?) 

 longitudinal muscles, are seen : the wheel is folded up. 

 Fig. 388 is another within its case, having the lobed rota- 

 tory organ expanded. Found upon hornwort (Ceratophyl- 

 lum), and other aquatic plants. Length about l-20th; 

 case l-40th. 



Genus CXLVI. LACINULAIUA. The horse-shoe Ani- 

 malcules have two eyes (in the young state), the cases 

 (urceoli) conglomerate, or grown together, and the rota- 

 tory organ two-lobed, when full grown, but circular when 

 young ; this organ is the chief instrument of locomotion : 

 band-like longitudinal muscles run within the body. The 

 nutritive apparatus consists of a large oesophagal head, 

 having two jaws, with teeth in rows, a short narrow 

 oesophagus, an elongated stomach, but with no coeca-like 

 appendages; two ovate pancreatic glands, and a short 

 globose rectum. The ovarium is situate about the middle 

 of the body, and contains but a few large ova; four fecun- 

 dating glands appear below the discharging orifice, which 

 latter is common to the ovarium, and alimentary canal ; 



