660 THE AMERICAN NATURALIST. [Vor. XXXIV. 
GENUS OCTOBOTHRIUM. 
Body sagittate, tapering anteriorly ; posterior suckers on a distinct disk 
which is not so wide as the body; 6 mm. long, 2 mm. wide: on gills of 
Castastomus teres (R. R. Wright) O. sagittatum F. S. Leuck.! (Fig. 33) 
GENUS OCTOCOTYLE. 
Body elongate, lanceolate ; anterior suckers elongate, posterior suckers 
small, slightly stalked, in two rows; genital pore with two longitudinal 
rows of six (five) small hooks each; two pairs of hooks between posterior 
pair of suckers ; 5 mm. eda .6 mm. broad : on gills of mackerel (Newport, 
Goto) . > ; . . s « OQ. scomóri Kuhn (Fig. 34) 
GENUS DACTYLOCOTYLE. 
Body lanceolate ; anterior portion of each posterior sucker with numer- 
ous denticulate papilla ; 8 mm. long, 2 mm. wide: on gills of the pollack 
(Woods Holl, Linton) . . . . D. denticulatum Ols. (Fig. 35) 
GENUS DICLIDOPHORA. 
Body elongate, spatulate, anterior portion elliptical, posterior portion 
cylindrical; posterior suckers on long stalks; cirrus armed with fifteen 
bifurcate hooks ; 12-40 mm. sed from the Been of flounder (Woods 
Holy. : : : D. offinis Linton (Fig. 36) 
GENUS MICROCOTYLE. 
4,. Testes not numerous, twelve to fifteen in number, median in hinder 
part of body. 
6,. Testes about twelve in number, in front of which is ovary ; length 
of sucker-bearing region about one-third that of body, with 
about forty-six pairs of suckers ; 2.5 mm. long, .6 mm. wide: on 
gills of Scup (Newport) . . . M. stenotomi Goto 
ő» Testes about fifteen in number, in ce of which is ovary ; length 
of sucker-bearing region about one-fourth that of body, with 
about twenty-three pairs of suckers; 2.5 mm. long, 6 mm. wide : 
on gills of blackfish (Newport). . . . M. hiatule Goto 
4,. Testes numerous, fifty to fifty-five in number, median in hinder part of 
» 
b,. Testes about fifty in number, in front of which is ovary ; length of 
sucker-bearing region about one-third that of body, with about 
seventy pairs of suckers ; 4 mm. 2 1 mm. wide; on gills of 
bluefish (Newport) . . . : . M. pomatomi Goto 
1 The systematic position of this species is uncertain. 
