MONTGOMERY. — Gordiacea, 
PLATE 3. 
G. aquaticus robustus. Surface view of the cuticle of a male, the intra- 
rhombic intersecting lines not reproduced (C, 4). 
G. aquaticus difficilis, n. subsp. Male, head end, from the type (A, 2). 
Idem, oblique lateral view of the posterior end (A, 2). 
Figs. 16-19, @. aquaticus robustus. 
Male, surface view of the cuticle, Canada balsam (C, 4). 
Female, head end (A, 2). 
Male, cross section through the body in the plane of the cloacal aperture. 
Cut., cuticula; Æpi., epidermis ; Musc., longitudinal musculature of the 
body wall; Cl. Musc., cloacal musculature ; Ch. t., connective tissue ; 
N., branches of the ventral nerve chord; Cl. Ap., cloacal aperture 
(C, 2). 
Male, ventral view of posterior end (A, 2). 
