128 THE AMERICAN MONTHLY [July, 
55. Monoura. 
Korica ovate. © Marines eh 20 ee rate 
56. Myrizia. 
Eves 2, frontal; wide apart. —Wlarine sess en io hee tavina. 
y ’ 
57. COCHLEARE. 
iSorica hemispheric s Mss ecema ier anne ae . . .  staphyleemss 
Lorica three-sided RP rer 20/005 | 
58. PTERODINA. 
a. Lorica subcircular, the sides movable, valve-like <6 aioe 
a. Lorica subcircular, inflexible, front acutely pointed .  . mucronata. 
a. Lorica subcircular, inflexible, front rounded’. . . . . Si pemzzzen 
6. Lorica elliptical, both ends truncate od aS Tecra 
Lorica ovate, front only truncate ae . truncata. 
59. PoMPHOLYx. 
Lorica with 4 longitudinal furrows . . PP 5 GU ERUE. 
Lorica not furrowed, front obtusely pointed 1 + » + * 5. (Com plaazaamE 
60. BRACHIONUS. 
a. Frontal spines 6; posterior spines 2 ole oe OL Ao ee 
a. Frontal spines 6; posterior 2, papilla-like . . « . « | BRGeahanae 
6. Frontal spines 4, the centrall.2teunved ys )=) j-1 a. dorcas. 
6. Frontal spines 4, straight, long, sharp) * % Mr 000 
c. Frontal spines reduced to unequal saw-teeth sloping inward. rubens. 
c. Frontal spines reduced to low teeth, their outer edges sinuate. Marine, 
Millerz. 
c. Frontal spines reduced to slight undulations; hind end with 2 blunt 
processes... 0 a 1 SAUCE ESD (09 PU 0 ca 
61. NoTeus. 
Lorica facetted, stippled ; front with 2 curved strips; hind end with 2 long 
SPINES’, scsibloey aces ot sen yeeteens meee Kona - + GUaaricorges 
62. ANURZA. 
Lorica with 6 frontal spines (@). 
Lorica without spines ine ( » «, « hypelasmem 
a. Posterior spines none; 5 ean faces only perfect . «4s CUPULCOFRES. 
a. Posterior spines none ; dorsal ridge present; facets large . . . fecta. 
a. Posterior spines 2 2, On the angles; surface tesselated . . . aculeata. 
a. Posterior spines 2 2, often obsolete : lorica very rough, tesselated, serrulata. 
a. Posterior spine 1, central; back ridged, tesselated . . . cochlearis. 
63. NOTHOLCA. 
Posterior point long, truncate . . . . s . . . = = 5 Sa@aecmeiaiee 
Posterior point a very long curved spine. . . - + - longispina. 
Posterior margin truncate. Marine . » = thalassva: 
Posterior margin rounded. Marine rrr SSS 
64. ERETMIA. 
Sete 6; 1 dorsal, 1 ventral, diverging; 4 straight, terminal . . cubeutes. 
Sete 5; 1 dorsal, 2 from each side "Lanes 2 DON Semaine ragamiads 
Sete 4; 3 frontal, 1 postero-terminal ; lorica obconic. .:) -4. detvatioemm 
65. PEDALION. 
Limbs 1 ventral, large; 1 dorsal; 2 unequal lateral pairs . . . mltrum. 
