No. 404.) MORTH-AMERICAN INVERTEBRATES. 6 53 
together at the ee of the body: 
on gills of marine fishe 
Anthocotyle v. Ben. et Hense (Fig. 37) 
i. Body elongate; anterior end pointed ; 
posterior end bearing eight sessile 
suckers at extremity of body, the 
median pair being smaller than the 
others: on gills of marine fishes 
Hexocotyle Blain. (Fig. 38) 
d,. Posterior region elongate, and bearing numerous small 
suckers, either paired or not; paired anterior suckers 
present . . . Subfamily III. Microcotyline 
e,- Body amer syanibisical; posterior suckers paired, 
numbering from Io to 120 on a side ; no hooks: on 
gills of marine fishes 
Microcotyle v. Ben. et Hesse (Fig. 39) 
by Body asymmetrical, one lateral side being more devel- 
oped than the other, and bearing most or all of the 
suckers. 
Jı Body tapering anteriorly, widening towards the 
hinder end, the latter forming, by a one-sided 
lateral expansion, a broad asymmetrical terminal 
disk bearing small suckers along its margin. 
£y Numerous suckers along the longer side of the 
terminal disk, a small number or none along 
the other side; no hooks present: on the 
gills of marine fishes 
Axine Abild. (Fig. 40) 
£y» A single row of suckers along the terminal disk, 
which is prolonged into a spatula-shaped 
appendix bearing two hooks: on gills of 
marine fishes (Caranx) 
Pseudaxine Par. et Per. (Fig. 41) 
f, Anterior end of body attenuate, hinder two-thirds 
widened on one side, on the margin of which is a 
row of small suckers ; hooks present at the pos- 
terior end : on the gills of marine fishes 
Gastrocotyle v. Ben. et Hesse (Fig. 42) 
€». Posterior region usi disk-like, without suckers, but with 
ON. . . Family V. Gyrodactylidae 
dı Two or four short sd acie lie projections at anterior end 
of body ; posterior disk with two large central hooks and 
numerous small marginal ones ; worms minute: on skin 
and gills of fresh-water and marine fishes. 
