Introduction to Animal Morphology. 197 



lorica nor intestine. In Asplanchna there is an entire trochal 



.nd toothed jaws. The male has two large and two 



small pairs of limbs, but no muscles. Ascomorpha has no 



water-vascular system, and rudimental, toothless jaws. Some 



ts, otherwise (indistinguishable from Notommata, are 



iproctous (N. myrmeleo). 



Order 2. Hoiotroeha proctuchous, disc entire, rounded, 

 including the families i . Ptyguridx only the post-abdomen 

 nted ; disc circular, with one (Ptygura) or two crowns 

 of cilia (Diplotrocha). 2. (Ecistidae tail long; disc round 

 or elliptical ; eyes present in the embryo, persisting or 

 vanishing (CEcistes) ; body in cylindrical, yellow thecce, 

 fastened to the base, single (CEcistes), or in free colonies 

 (Conochilus). 



Order 3. Schizotrocha proctuchous, trochal disc lobed, 



notched, or divided, i. Megalotrochidae deeply notched; 



none ; umbrella-shaped, free, and possessing eyes 



when young, but the adults arc sessile and blind. 2. Floscu- 



laridx- disc 2-4 lobed, or with 5-0 tentacles (Stephanoceros), 



sometimes with two proboscides and a tubular lorica beset 



with lenticular bodies (Mclicerta). 3, Hydatinidx un- 



many-lobrd. Pleurotrocha has one tooth and 



Ilydatina has a short foot, no eyes, and several 



itommata has a nuchal eye. llexarthra and Tolv- 



arthra have limb-like processes. Diglena has two frontal 



Triophthalmus has three eyes. 4. KuchhmidiE like 



it, but loricated. Kuchlani> has OIK- eye-speck and a 



>hort jointed foot. Salpina is pointed at each end, has one 



Metnpidia has two eves, and Lepa- 

 del! 



r 4. Xygotrocha two, simple, trochal discs, often 



; frontal lobe between them. Family i. Philodiniiku 



!, with a long divided tail ; jaws two, crescentic, with two 



Oviparous, with two frontal Ivotifer) 



or nu. loimd in Alpine snows), or none 



S ariilinid.i -utli Imig joints, often 



with i retrat tile ; skin ridium), or 



hard I liioiiid.e loricated, 



,nd ^Anur.ea), or with the foot j< 



