Euplota.] THE INFUSORIA. 325 



551. DISCOCEPHALUS rotatorius. The vibrating Disco- 

 cephalus. Body transparent, flat, head smaller than the 

 body, both rounded. Fig. 345 is an under, and 346 a side 

 view. Found in the Red Sea. Size l-380th. 



Genus CXXXI. HIMANTOPHORUS. The whip-footed 

 Animalcules are distinguished by the absence of styles and 

 teeth, by having numerous uncini, and not having the head 

 distinct from the body. The long bent hooks, generally 

 in pairs, appear like a broad band upon the under side, 

 serving as organs of locomotion ; near them is a row of 

 cilii, extending from the mouth to the middle. The mouth, 

 discharging orifice, and numerous digestive cells, are 

 distinct. At the posterior margin is a large contractile 

 vesicle ; between the row of cilii and margin on the right 

 is a series of glandular spots. Self-division has not been 

 observed. 



552. HIMANTOPHORUS charon (M.) Body transparent, 

 flat, elliptical, anterior slightly truncated obliquely, cilii 

 short, uncini long and slender. The mouth commences 

 anteriorly at the lower angle of the triangular bright spot, 

 but the true oesophagal opening appears to be at the end 

 of the row of cilii within the curved lorica ; the posterior 

 alimentary opening is nearly at the base of the last cluster 

 of four to six comb-like uncini, which supply the place 

 of styles. Fig. 347 is a side, and 348 an under view. 

 Found in water vessels that have stood some time. Size 

 l-180th. 



Genus CXXXII. CHLAMIDODON. The toothed Ani- 

 malcules possess cilii and teeth at the mouth, but no styles 

 or uncini ; an oval transparent lorica or shield covers the 

 back, and projects around it; a margin of cilii surrounds the 



