108 THE AMERICAN MONTHLY [May 
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Toes scythe-shaped, base wide apart; lorica tesselated, 
poitited behind 3) a ig wy , ludwigii. Sup 
Lorica smooth, semi-orbicular, front truncate...hornemanni. Sup 
Lorica rough with crescentic elevations.........00.0..000002.-1- signifera* 
Lorica fluted, front with 2 lateral points... striata. Sup 
-Lorica facetted ; 2 postero-lateral thorns ; toes 
curved ...spinifera. Q., 1894, 427 
Lorica facetted ; 2 terminal spines _........... (Cathypna) stokesii 
52. Monostvia. II., 97. Sup. 44. 
Claw between 2 slender spines, (b) 
Claw 2-shouldered, (c) 
Claw not shouldered nor spinous, (e) 
Frontal points wide, triangular; lorica broadly ovate....... lunaris 
Frontal points small, incurved, distinct; lorica-outline 
Sub-circtlar 3 oy al er ef ee robusta§ 
Frontal points small, not incurved ; lorica broadly oval.....bipes§$ 
Dorsum tesselated ; hind excavation 3 sides of a square........ lordii 
Dorsum not tesselated, (d) 
Lorica-outline sub-circular; front with 2 wide, decurved 
SPOUT OI se ohsig ops ass anes ts duacasnleteer eeddetmal stg MRNA MRE quadridentata 
Lor,-outl. obl’ng ; sub-cylindric,soft,flexible, skin-like.mollis.Sup 
Lorica-ontline oval; transverse section sub-circular..... bulla 
Foot (toe) fusiform ; jaws triangular.............. closterocerca. Sup 
Toot bulbous; toe slightly blade-shaped 2. cornuta 
Foot bulbous; toe not blade-shaped oi. ieee cece eee eeeee hamatat 
53. CoLurus. II.,101. Sup. 45. 
Fresh-water, (a) 
Marine, (g) 
Lorica dorsally ovate or oval; not crested, (b) 
Lor. dorsally ovate, w. long, stiff, p’nted crest..cristatus. J.,’93,449 
Lor. dorsally pyriform, widest behind; foot and toes long..caudatus 
Lorica ventrally cleft, (c) 
Lorica not cleft... ..... PULA SENT EPL MRC ELIE ERE bicuspidatus 
Posterior lorica-end produced into spines, (e) 
Posterior lorica-end not produced into spines, (d) 
Foot small, toes minute, seta-like oi... lccceceee ccceccccee cece eee eee obtusus 
Foot 4-jointed, toes conspicuous, acute................ agilis. J., 1896, 269 
Dorsal hind points acute, (f) 
Do. blunt ; lorica-frontt runcate; ventral cleft wide.......... uncinatus 
Dorsal aspect long oval; toesingle; foot and toe % 
Lorica Leni th) eee i oe ee eae oe Ra leptus. Sup 
Dorsal aspect broadly ovate; rear points slight; toes 
very slender micromela. Sup 
ee ewne eee enanerae as 
* Jennings. Bul. Mich. Fish Com., No. 6, 92. 
t+ Stokes. Ann. & Mag. Nat. Hist., 1896, 21. § do 1896, 21 
