SPIROTRICHA, OLIGOTRICHA 655 



extended to the whole family by Dogiel (1927). It is most probable 

 that many species are varieties of a single species as judged by the 

 work of Poljansky and Strelkow (1934) ; but since information is still 

 incomplete, the present work ranks various formae with species, in 

 agreement with Kofoid and MacLennan (1930). 



Genus Ophryoscolex Stein. Ovoid; with adoral and dorsal zones 

 of membranellae; dorsal zone some distance behind anterior end, 

 encircling 3/4 the body circumference at middle, broken on right 

 ventral side; 3 skeletal plates extend over the body length on right- 

 ventral side; 9-15 contractile vacuoles in 2 (anterior and posterior) 

 circles; macro nucleus simple, elongate; in the stomach of cattle, 

 sheep, goat and wild sheep (Ovis orientalis cycloceros). Several species. 

 Dogiel (1927) designated the following species as 3 formae of 0. 

 caudatus Eberlein. 



0. hicoronatus Dogiel (Fig. 308, a). 120-170^ by 81-90^; primary 

 spine 38-58/i long; in sheep. 



0. caudatus Eberlein (Fig. 308, b). 137-162^ by 80-98/^; preanal 

 spines 47-60^ long; in sheep, goat, and cattle. 



0. quadricoronatus Dogiel (Fig. 308, c). 128-180ai by 86-100^; 

 preanal spines 48-63m long; in sheep and Ovis orientalis cycloceros. 



Genus Caloscolex Dogiel. Ovoid; anterior end truncate, posterior 

 end rounded with or without processes; 2 zones of membranellae; 

 dorsal zone encircles the bod}^ completely; 3 skeletal plates variously 

 modified; 7 contractile vacuoles in a single circle; nucleus elongate; 

 in the stomach of Camelus dromedarius. Several species. 



C. cuspidatus D. (Fig. 308, d). 130-160^ by 73-90^. 



Genus Entodinium Stein. Without dorsal zone; adoral zone at 

 truncate anterior end; without skeleton; contractile vacuole ante- 

 rior; macronucleus, cylindrical or sausage-form, dorsal; micronucleus 

 anterior to middle and on left-ventral side of macronucleus; in cattle 

 and sheep. Numerous species. 



E. caudatum S. (Fig. 308, e). 50-80/i long; in cattle and sheep. 



E. bursa S. (Fig. 308, /). 55-114^ by 37-78/1 (Schuberg); SO/x by 

 60ju (Becker and Talbott) ; in the stomach of cattle. 



Genus Amphacanthus Dogiel. Similar to Entodinium; but spinous 

 processes at both anterior and posterior ends ; in stomach of Camelus 

 dromedarius. One species. 



A. ovum-rajae D. (Fig. 308, g). 46-55/x by 32-48/x. 



Genus Eodinium Kofoid and MacLennan. Dorsal zone on the 

 same level as adoral zone; without skeleton; macronucleus a straight, 

 rod-like body beneath dorsal surface; 2 contractile vacuoles; in 

 cattle and sheep. Several species. 



