110 THE AMERICAN MONTHLY [May 
56. Mvyvrinia. II., 110. Sup. 49. 
a Byes 2, frontal, wide apart 3. ae tavina 
b Kye 1, cervical; lorica very flexible... ou... poecilops. Sup 
b Eye 1, frontal; skin flexible; body very extensile.producta. Sup 
b Eye 1, occipital; toes together wider than foot, abruptly 
Fk oo, I BABA RS CAR Mu SA0. A teresa. Sup 
§7. COCHILEBARE. II., 111. 
a Lorica hemispheric... io A AN A Pe 40F phere staphylinus 
a Lorica three-eided sisi o  a turba 
58. Pterodina. II., 112. Sup. 50. 
A Lorica sub-circular, (a) 
A lLorica elliptical, (d) 
A lLorica ovate; commensal on Asellus, (g) 
a lLorica inflexible, not laterally folded, (b) 
a lLorica sides often folded ; gastric glands clavate................ valvata 
b Lorica without projecting mucro or tooth, (c) 
b Lorica with an acute frontal mucro........ eee ee mucronata 
b Lorica with a tooth on each postero-lateral . 
PO ap ats RORORORA CER CEU DDE ME Mela See RE I bidentata. Q., 1898, 24 
c Front dorsal edge rounded........... ih ila il la ails arta patina 
c Front dorsal edge emarginate....0 0. eee parva. Q., 1898, 24 
dad. Lorica ends truncate. Marine. cj ee oie viii hanes clypeata 
d lLorica ends not truncate, (e) 
e Lateral halves bent upward; edges thick, rounded...reflexa, Sup 
e Lateral halves bent upward; edges thin, not rounded.......... incisa* 
e Lateral halves not bent upward, (f) 
f Commensal on Asellut vulgaris ; foot-open’g crescentic..elliptica* 
g Eyes absent; dorsal front edge with rounded cone... coeca* — 
g Aspecies hardly separable from patina... uu, truncata 
59. PompHoLyx. II, 115. 
Lorica with four longitudinal furrows................ Oe eee ae sulcata 
Lor. not furrowed, entire, 2-sided ; front obtusely p’nted.complanata 
60. BRACHIONUS. II., 116. Sup. 50. 
a Frontal spines 10, posterior 4.0000... aca iach: militaris. Sup 
b Frontal spines 8, posterior 4.00000 ww... Linda pas gih i Palrder ia: Sup 
c Frontal spines 6, (g) 
d Frontal spines 4, (m1) 
e : Frontal spines 9) ies oh iat oie eae Ga tridens 
f Frontal spines none or reduced to a or to mere teeth, (0) 
g Posterior spines none, (h) 
g Posterior spines 2, papilla-like urceolaris 
g Posterior spines 2, long, permanent (variable) 22 00.... bakeri 
& 
Posterior spines 2, long, lost in age, (k) 
* Rousselet. Q., 1898, 24. 
