740 THE AMERICAN NATURALIST. [Vor. XXXV. 
ciliated projections (auricles) present in many species. Jaws forci- 
pate. Soft, flexible, elongated rotifers ; exceedingly numerous 
usse. NOTOMMATAD 
dz. Withouteyes . . Pleurotrocha 
er. Externally riadit on ON water peer 
, P. parasitica Jennings 
22. Free-swimming, body elongated, ia with numerous 
marked annulations ; head enlarged, with a decurved hood 
or fleshy proboscis in front; possibly one or two eyes present 
, Taphrocampa saundersie Gosse (Fig. 66) 
e3. Free-swimming; elongated, convex above and gibbous 
posteriorly; flat ventrally ; indications of a neck between head 
and body ; a small hook-like proboscis in front; corona a 
ventral ciliated area one-third the length of the body; foot 
very small; toes minute; auricles present; two dorsal 
antenne ; baie with dark granules at the posterior end 
93, P. (Diglena) contorta Stokes 
d2. One eye 
ez. Eye in the neck, — that is, attached to the brain, some 
distance from the front of the head 
ft. Body with numerous permanent conspicuous annulations 
or crenulations ; minute larva-like forms; a small pro- 
jection or “ tail” just dorsad of the toes ; protrusible auri- 
cles present but frequently remaining hidden 
Taphrocampa 
gi. Body nearly cylindrical, short, thick ; brain opaque ; 
two auricles present 
Ar. Toes short and thick, conical, diverging so as to 
make an acute angle . . . . . 94, T. annulosa 
A2. Toes longer, slender and curved ; so placed that 
the two together form es outline of a crescent 
i: , T. selenura Gosse (Fig. 68) 
£2. Body elongated Reid crenulate; head not 
enlarged ; brain containing a club-shaped granular 
region; toes short; stout, conical, forming an acute 
angle with each other . . 96, T. clavigera Stokes 
(See ib No. 92, T. saundersi@) 
f2. Body without numerous permanent conspicuous annula- 
tions (though divisible into a number of joints) 
(Cuticula somewhat stiffened and with a slight longitu- 
dinal dorsal cleft, — see Mecum Nos. 181, 182) 
£I. Very large species (.2 7 mm. in length) slow 
moving, usually enlarged inet the middle ; brain three 
(or five) lobed, clear or opaque ; corona extending 
i 
