Floscuhiria.'] INFUSORIAL animalcules. G19 



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

 present. The ova are deposited within the case, and there developed ; 

 neither male organs, gills, nor vessels 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 globules, which 

 Dr. Ehrenberg considers nervous ganglia, or brain. 



LiMNiAS ceratophylU. — Case white at first, afterwards brown, or 

 blackish; smooth, but being viscid, often covered with extraneous 

 particles ; its connection with the animalcule is a voluntary act of 

 the latter ; the two red eyes and the jaws may be observed in the 

 ova, when developed ; by giving the latter 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 oi-gau 

 nearly circular , it also shows 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 rotatory organ expanded. 

 (P. 23, fig. 2, more magnified.) Found upon hcrnwort (Cerato- 

 phyllum), and other aquatic plants. Length about 1-^th ; 

 case ]-10th. 



L. ? appears to be a distinct species which I do not 



find described. The case is ribbed and semi-transparent, and is 

 composed of a series of lateral rings. Found in a ditch near 

 Witlingham, Norwich, on duck-weed, (Brightwell.) 



Genus Lacinulakia. — The hoi'se-shoe Animalcules have two eyes 

 (ill the young state) ; the cases (urceoli) conglomerate, or grown 

 together ; rotatory 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. QEsophageal 

 head large, with two jaws, and teeth in rows ; oesophagus short, 

 narrow ; stomach elongated, but with no cseca-like appendages ; 

 pancreatic glands two, ovate ; rectum short, globose. The ovarium 

 is situate about the middle of the body, and contains but a few large 

 ova ; four fecundating glands appear below the discharging orifice. 



