400 



THE INFUSORIA 



Family PROROTRICHINA, Biitsclili. Biitschlia, Schuberg. Very minute 

 cilia covering the general surface of the body, but a special perioral 

 crown of longer cilia, and a tuft of the same at the posterior extremity. 

 0'06. Rumen of Ruminants. The genera Blepharocodon, Bkpharopros- 

 thium, and Blepharosphaera described by Bundle from the coecum of the 

 horse are perhaps members of this family. 



Family AMPHILEPTINA, Biitschli. Amphileptus, Clap, and L. The 

 anterior end pointed, and on the ventral side of this a long slit -like 

 mouth. Meganucleus in two or four pieces. 0'2. Marine, freshwater, 

 and in infusions. Lionotus, Wrzs. Similar to above, but rather more 

 elongated and flattened. 0'4. Marine and freshwater. Loxophyllum, 

 Duj. Similar to above, with the body more flattened and 

 contractile. 0'04. Marine and freshwater. Loxodes, 

 Ehrb. A creeping, spindle-shaped form, with several 

 meganuclei and micronuclei. 0'5. Freshwater. 



Family TRACHELINA, Stein. Trachelius, Clap, and L. 

 (Fig. 7). Spherical in form, with a short proboscis in 

 front of the round mouth. O4. Freshwater. Dileptus, 

 Duj. (Fig. 50). Very elongated and contractile, with a 

 long proboscis armed with trichocysts in front of the 

 round mouth. Meganucleus moniliform. 1 mm. Marine 

 and freshwater. 



Family NASSULINA, Biitschli. Nassula, Ehrb. Oval 

 forms with a long, 



complicated pharyngeal >; t: ..-, 



armature. Mouth on 

 the ventral side, a short 

 distance from the an- 

 terior end. Frequently 

 red, blue, or brown in 

 colour. 0'3. Fresh- 

 water and marine. 



Family CHLAMYDO- 

 DONTA, Stein. Ortho- 

 don, Gruber. Cilia on 

 ventral side much 

 longer than on the 

 dorsal side. Mouth on 

 the right side. 0'26. 

 Marine and freshwater. 

 Chilodon, Ehrb. Oval in 

 outline. Strongly com- 



c, c, trichocysts on pressed dorso-ventrally. 



the ventral side of 7. _ Tr . . - . , , , , _,. , 



the proboscis; d, 0'3. Very common in imusions. (JMamydoaon, Jiihrb., 



e > O'l 2, marine ; Scaphidiodon, Stein, O'l, marine ; 

 Phascolodon, Stein, 0'09, freshwater; and Opisthodon, 

 Stein, O'l 8, freshwater, are all closely related to Chilodon. 



Family DYSTERINA, Clap, and L. Aegyria, Clap, and L. Body 

 usually ventrally folded. Cilia apparently confined to the ventral side. 



o 



c.v 



FIG. 50. 



Dileptus anser, 

 O.F.M. (-Amphi- 

 leptus gigas of Cla- 

 parede and Lach- 

 mann). b, b, con- 

 tractile vacuoles ; 



a food vacuole 

 mouth, x 100. 



ta 



Fio. 51. 



Dysteria armata, Huxley, o, mouth ; M, 

 meganucleus ; TO, micronucleus ; c.v, c.v, 

 four contractile vacuoles ; eg, anal cirri ; 

 to, caudal appendage. ( After Schewiakoff.) 

 X 400. 



