94 THE AMERICAN MONTHLY [May 
4. STRHPHANOCEROS. _ I., 60. 
Only one species Eichhornii 
5. MELICERTA. I., 67. 
a Pellets subspherical ; lobes wider than the tube.................... ringens 
b Pellets pointed, cylindric ; lobes as wide as the tube............ conifer 
c Pellets ovoid, large; upper lobes deeply separated... Janus 
d Pellets none, tube gelatinous; lobes thrice the 
body-width tubicolaria 
6. Limnias. I., 75. Sup. 4. 
a ‘Tube straight. (b) 
a ‘Tube curved or twisted, (c) 
b Tube transversely ringed or ridged......... annulata 
b Tube not ringed or ridged, colorless in Ceratophylli 
b Tube yellow, cylindrical, strewn with brown granules..granulosa 
b Tube widening upward, clear below, floccose above, beset 
with transverse rows of minute points..Shiawasseensis. Sup 
c Tube obscurely ringed, both ends clear; ventral antenne 2, 
Wery TORR. oa ae ee a ee eee cornuella. Sup 
c ‘Tube opaque, base solid, tapering ; 2 horny processes on 
dorsum below the corona.............. Myriophylii Q., 1891, 320 
7. CEPHALOSIPHON, I., 77. 
a Tube membranous, tapering to the base limnias 
a Tube gelatinous, irregular, semi-transparent............ ie candidus 
8. GicistTES. I., 79. Sup. 5. 
A Tube short or none; foot twice or thrice the body-length, (a) 
A ‘he 4 ‘¢ foot not longer than the body............ velatus 
A Tube floccose, irregular, (b) 
A Tube gelatinous, (c) 
A Tube of pellets; antense long pilula 
A. Tube membranous cue ee intermedius 
a ‘Two dorsal hooks below the corona, adnate at base...serpentinus 
a One minute horny process on dorsum below the corona 
mucicola. Sup 
a No dorsal hooks; no tube; foot twice body-length ; 
teeth 3 socialis. Sup 
b Ventral antenne long, recurved...... longicornis 
b RE ft ‘¢ corona crossed by thick ribs...........umbella 
b Ventral antenneze very short, wide apart ...crystallinus 
b Ventral antennz none; 2 large, dorsal hooks, adnate 
for 3 ‘their Jenene ptygura 
c Corona 2-lobed; ventral antenne long, mobile................ brachiatus 
ec Corona circular: ventral antennze mere tubercles stygis 
c Corona subcircular; ventral antenne stout, not long; 
foot short ca brevis. J., 1893, 448 
