No.417.] WORTH-AMERICAN INVERTEBRATES. 743 
h2. No proboscis 
zz. Living in gelatinous masses of alge, or some- 
times free in waters full of unicellular alge. Body 
nearly cylindrical or oval, slightly arched dorsally ; 
eye large, in two parts, at the anterior border of the 
brain; foot and toes minute. Adults yellowish 
brown in color . . . 112, P. algicola Kellicott 
22. Body nearly cylindrical, thick, clumsy ; head 
broad, truncate; foot very broad, with a depres- 
sion in the median i ; sie conica 
P. sordida Gosse (Fig. 81) 
73. Body thick, iced n at the head, very flexible 
and changeable, colorless ; toes minute, conical ; 
eye small, inconspicuous . . 114, P.(F urcularia) 
micropus Gosse (Fig. 82) 
74. Body slender, soft, larva-like ; toes minute ; foot 
indistinguishable. . . . . 115, P. decipiens 
75. Body strongly arched dorsally, flat or convex 
ventrally ; foot conical ; toes minute 
P. gibba Ehr. (Fig. 84) 
(The animal described under this name by Hudson and 
Gosse is totally different from Ehrenberg's) 
«2. Eye frontal, placed near or at the anterior end of the body. 
Body nearly cylindrical, somewhat larviform, frequently en- 
larged in the lumbar region ; anterior end conical ; corona 
oblique ; the two toes usually rather large and conspicuous 
Furcularia 
$ lender 
JT. Toes unequal, very long and s Lo enirere Eli 
J?. Toes equal 
41. Toes blade-shaped, acute, decurved, the ventral edge 
of each notched with two (or sometimes three or more) 
teeth... . « » 118, F. forfiicula Ehr, (Fig. 85) 
£2. Toes sae and stout at base, and abruptly passing 
at about a third of their length from the base into a 
hair-like filament . . . . . . 119, £F. semisetifera 
Glascott 
£3. Body slender, compressed, the ventral line making a 
prominent angle; front rounded; gut hup : toes 
slender, straight, acute... . . o, F. gracili 
"hr. (Fig. 86) 
£4. Body oblong, slightly compressed, convex on the back, 
abruptly falling off steeply to the foot; toes stylate, 
straight, acute, nearly half the length of the body 
121, F. gibba Ehr. (Diaschiza semiaperta Gosse?) 
(Fig. 87) (F. micropus, — see No. 114) 
