102 THE AMERICAN MONTHLY [May 
d Proboscis large, fleshy, decurved; body cylindric, slender..... felis 
d Proboscis none; body compressed; back arched; toes de- 
CUBTOO ie id ih is Ake a Dali ake hs JS ne gibba 
e Foot-broad, with median depression; head broad, truncate..sordida 
e Foot long, stout, very distinct; body ovate... petromyzon 
e Foot long, stout; body fusiform, head distinct............ laurentinus* 
e Foot minute; mastax forcibly protrusile........... orthodon. Sup 
e Foot minute; mastax not protrusile ; eyel’ge, in 2 parts..algicolat 
35. FurcuLARIA. II., 40. Sup. 25. 
A ‘Toes longer than the body, unequal, (a) 
A Toes longer.than the. body, equal... (340 2a so zequalis 
A Toes shorter than the body, (b) 
a Two large, red, lumbar spots. Length 1-60 
Dae. sic cahineiuadectnaabce dco vening needy inc iellaa hameiaaee grandis. Q., 1895, 124 
a Nolumbar spots. Length about 1-100 inch _0 oo . longiseta 
b ‘Toes blade-shaped, not notched, (c) 
b ‘Toes not blade-shaped, not notched, (d) 
b Toes blade-shaped, notched with 2 teeth... forficula 
b Toes blade-shaped, notched with 3 teeth tubiformis. Q., 1893, 139 
c Fresh-water ; foot-joints none; eye none; body gibbous..ensifera 
c Fresh-water; foot long; eye 1; body ovate; head 
truncate ASAI Vey EN RDB PEE IL a molaris. Sup 
c Marine; toes small; body long, cylindric... marina 
d ‘Toes moreor less decurved, often only at the tip, (e) 
d Toes straight, often short, conical, (f) 
e Foot and toes as long as the trunk; tail pointed........ lactistes. Sup 
e Foot and toes shorter; head truncate; tail decurved, 
POE ee aI A Ale ee el epee sterea. Sup 
e Foot and toes shorter ; head rounded; neck constricted.........czeca 
f “Toes minute, conical ; eye none nile ee, micropus 
f° Toes % foot-length, conical 5 eye Lio nai Boltoni 
f Toes about % body-length, (h) 
f Toes about &% body- length, (g) 
f Toes less than 4% body-length, (i) 
g ‘Toes basally broad, tapering to long points... lophyra. Sup 
g Toes slender; front rounded; body slender... gracilis 
h ‘Toes stylate ; back convex, abruptly falling off to foot.......... gibba 
h Toes basally thick, abruptly attenuated... Eva. Sup 
i Toes conical, ending ‘in long, soft points; foot 
To ¢ - SPR MAUR SMO CELE: OUP fF .melandocus. Sup 
i ‘Toes small, acute; foot short ; body globose................ spherica. Sup 
36. EospHora. II., 47. Sup. 28. 
a Head separated by a neck; auricles present... aurita 
* Jennings. Bul. Mich. Fish Com., 1894, 12. 
+ Kellicott. Trans, Am. Micros. Soc., 1897, 48. 
