19 

 f. No alius, intestine ending blindly ; body more or less sac like. 



ASPLANCHNID^. 



g. Body very large ; cuticle delicate ; jaws incudate ; stomach with- 

 out blind evaginations. 

 h. Foot present ; viviparous. Asplanchnopus. 



hh. Foot absent ( fig. 13). Asplaiic/ma. 



gg. Body very small, cuticle firm ; jaws of the forcipate type (fig. 

 39), .stomach with blind sacs, which may nearly fill the body 

 cavity. Ascoiiiorpha. 



ff. Anus present, 

 g. Foot wanting ; body bearing swimming or skipping appendages 

 ill the form of moveable spines, blades, or branching crustacea- 

 like limbs (except in Anarthra aptera). Thriarthrid.^. 



h. With skipping appendages, 

 i. Twelve blade shaped appendages, with .serrate edges, in four 

 groups ; one eye (fig. 18). Polyarthra. 



ii. With fewer appendages ; two eyes. 



j. Two very long spines. Pedetes. 



jj. Three long spines (fig. 16). Triartlira. 



hh. No such appendages, foot present. Anartlira. 



gg. Foot present, with two toes side by side ; body without swimming 



appendages. 



h. Corona large, nearly traiisver.se, with prominences bearing styles. 



i. Form a broad, often swollen cone, of which the foot forms the 



apex, corona transverse, flat or strongly convex, with 4 long 



styles and a number of style-like prominences ; at the sides of 



the corona two large ciliated auricles which may be retracted, 



eye single (figs. 14, 15). Synch^tid^. SynclKcta. 



ii. Corona slightly oblique, surrounded by a wreath of cilia which 



is interrupted ventrally, and bearing a number (3 to 7) of 



large prominences crowned with styles ; mouth near ventral 



side of corona, no ciliated auricles. Hydatinid.i;. 



j. Corona extended dorsally into a large and broad proboscis 



fringed with cilia and bearing near its end two red eyes. 



Rhinops. 

 jj. With a different combination of characters, 

 k. Eyes two ; jaws forcipate (fig. 39), foot slender, of three 

 joints ; stomach with six long csecal projections. 



Triphylus. 

 kk. A single e3'e or without eye. 



I. Eye colorless (or wanting?) body long conical, (fig. 17). 



Hydatina. 



II. Eye one, usually red. 



ui. Body long conical, humped dorsally, its outline with three 

 distinct curves ; corona with three style-like prominences, 

 ciliary wreath encircling the corona and a subquadrate 

 space at right angles to the corona ou the ventral surface. 



Cyrtouia. 



