312 DESCRIPTION OF [Polygastrica 



Animalcules have neither tongue-hke process or eye, but 

 are provided with a proboscis and tail. In three species 

 the organs of locomotion are numerous cilii disposed in 

 longitudinal series; in one, cilii are not visible, but in this 

 the flexible attenuated extremities of the body serve the 

 office. In some, the tail (foot) and proboscis (brow) are ru- 

 dimentary. In five species numerous digestive cells, filled 

 with food, may be seen; in seven the mouth is distinct; 

 and in five of them a discharging opening. All have a 

 colourless digestive juice, except A. margaritifer, in which 

 it is pale rose-red. Ova granules are observable in seven 

 species, which in one are green, in the others whitish. In 

 four species a contractile vesicle is seen; in three sexual 

 glands, which in two are globular, double, and monili- 

 form; in the third self-division has been observed in one 

 species, both as transverse and longitudinal, and in another 

 as transverse only. The figures of this genus were en- 

 graved before I discovered Dr. Ehrenberg had not arranged 

 his illustrations according to the classification. 



518. Amphileptus anser {Vibrio anser et cygnus, M.) 

 The luhite Amphileptus.— Body turgid, spindle-shaped, 

 proboscis obtuse, same length as body, tail short and acute. 

 The neck-like proboscis is truly a brow or upper lip, the 

 mouth being at the base. Ehrenberg thinks he has seen 

 the anal opening upon the dorsal surface, near the tail. 

 The motion of the body is slow, but that of the proboscis 

 more active. Figures 312, 313, represent two views of 

 this creature. Found amongst dead sedge leaves, &c. 

 Size 1 -120th. 



519. Amphileptus margaritifer. The pearl Amphi- 

 leptus. — Body white, slender, spindle shaped; proboscis 



