358 Illinois State Laboratory of Natural History. 



apices ; ciliary wreath single, edging the corona ; 

 intestine and cloaca absent. 

 Synchaetidce. Corona a transverse spheroidal segment, 

 sometimes much flattened, with styligerous promi- 

 nences ; ciliary wreath a single interrupted or con- 

 tinuous marginal curve, encircling the corona ; 

 mastax very large, pear-shaped ; tropin forcipate 

 (Fig. 3, D) ; foot minute, furcate. 

 Triarthridce. Body furnished with skipping append- 

 ages ; corona transverse ; ciliary wreath single, mar- 

 ginal; foot absent. 

 Hydatinidce. Corona truncate, with styligerous promi- 

 nences ; ciliary wreath two parallel curves, the one 

 marginal, fringing the corona and buccal orifice ; 

 and the other lying within the first, the styligerous 

 prominences being between the two ; tropin malleate 

 (Fig. 3, A) ; foot furcate. 

 Notommatidre. Corona obliquely transverse ; ciliary 

 wreath of interrupted curves and clusters, usually 

 with a marginal wreath surrounding the buccal ori- 

 fice ; tropin forcipate (Fig. 3, D) ; foot furcate. 

 2. Suborder Loricata. Integument stiffened to a wholly 

 or partially inclosing shell ; foot various. Corona 

 and ciliary wreath various in shape, tropin of different 

 types, but, except in the Pterodinidte, these struct- 

 ures are never as in Rhizota or Bdelloida. 

 Division I. Foot jointed, stylate or furcate ; not trans- 

 versely wrinkled nor wholly retractile. 

 Rattid'uhe. Body cylindric or fusiform, smooth, with- 

 out plicae or angles ; contained in a lorica closed all 

 around, but open at each end, often ridged ; tropin 

 long, asymmetric ; eye single, cervical. Variously 

 asymmetrical. 

 Dinocharidce. Lorica entire, vase-shaped, or depressed ; 

 sometimes faceted, often spinous ; head distinct, 

 with a chitinous covering ; foot and toes often greatly 

 developed ; tropin symmetrical. 

 Salpinidce. Body more or less completely enclosed in 



