99 THE AMERICAN MONTHLY [May 
z Frontal plate a semi-circular shield...................Stephanops, 44 
aa Toes 2; lorica subspherical, gaping behind... Colurus, 53 
aa Toes 2; lorica depressed, open at each end... ....... Metopidia, 54 
aa ‘Toes 2; lorica 3-siced, ridged, flexible... Cochleare, 57 
aa Toe1; lorica compressed, Marine... oo... cc ccccceccere .Monura, 55 
bb Body fusiform or cylindrical, not curved, ; toe 1, 
with basal stylets Mastigocerca, 39 
bb Body cylindrical, curved, (cc) 
cc Toes 2, symmetrical, side by side... ccc eeseeeeee Rattulus, 40 
ce Toes 2, hollow, unequal, triangular, superposed plates 
PAOD SHARE ROMO NR Ow i cAMP TS  wasssseree, COLlopus, 41 
dd Lorica with deep, lateral sinus, covered by flexible 
membrane, (ff) , 
dd Lorica plates dissimilar, forming 2 unequal body-cayities, (ee) 
ee - Both plates chitinowa ss ii eo a Euchlanis, 49 
ee Ventral plate membranous, or none, flexible, expansile 
ERTRRRAR IR NRL CARY Tv Nina Un eegne DENS. FY Dapidia, 73 
ff Lorica subaircular 4 itt OUtline: tees Bo ay Cathypna, 50 — 
ff Lorica subcircular in outline; toe 1.000000 cee Monostyla, 52 — 
ff Lorica a long ellipse, closed behind; toes 2.00000... Distyla, 51 
gg Lorica oblong, spinous; eye Loi. cece ccecseeceeeeeen .... Salpina, 47 
ge Lorica. not spinous; CYS Dome ee Diplax, 46 
gg Lorica dorsal only, ventral surface naked. . .......Wiaschiza, 45 
gg Lorica of 2 plates, ventral flat, dorsal arched... Diplois, 48 
hh Lorica dense, shagreened, facetted, with projecting 
plates or dorsal spines ; foot with spines... Dinocharis, 42 
hh Lorica thin, smooth, without spines or plates; foot 
without spines: toes very long... 0... Scaridium, 43 
ii Foot ending in a ciliated cup, toes none, (jj) 
ii Foot ventral, toe present, (11) 
ii Foot not ventral, ending in 2 toes, (kk) 
ii Foot not ventral, with 2 unequal branches, each with 
PURO MAT ROR Rs ie Ta GENK) Schizocerca, 75 
jj Lorica sub-circular, entire, flattened Pterodina, 58 
kk Lorica without elevated ridges ; toes smazll............ Brachionus, 60 
kk Lorica facetted and covered with points... 0... Noteus, 61 
11 Lorica areolated, rough, opaque, thick................ Gomphogaster, 76 
11 Lorica smooth, often flexible, a ridge on each side....Gastropus, 81 
| SPECIES. 
1, Froscuiaria. I., 43. Sup. 3. 
a Lobes none; coronal sete very short................ edentata 
a Lobes none; free-swimming pelagica, J., 1893, 444 
a Lobes 2, (b) 
a Lobes 3, (d) 
a Lobes 5, knobbed, (h) 
a Lobes 5, not knobbed, (i) 
