MONTGOMERY. — Gordiacea, 
EXPLANATION OF THE PLATES. 
AU the figures have been drawn with the aid of the camera lucida, unless other- 
wise specified. The microscope and lenses of Zeiss were used; almost all the 
contour figures of the body have been drawn with oc. 2, 0bj. A; and the majority 
of the surface figures of the cuticle with oc. 4, obj. C. 
PLATE 1. 
Gordius aquaticus robustus. 
Fig. 1, Male, ventral view of posterior end (A, 4). 
Fig. 2. Idem, head end (A, 2). 
Fig. 3. Male, oblique ventral view of posterior end (Harvard coll. 290, A, 2). 
Fig. 4. Lateral view of the preceding, from the left side. 
Fig. 5. Male, ventral view of posterior end (A, 2). 
Fig, 6. Male, ventral view of head end; the transverse curved line shows the 
posterior extension of the white area (A, 2). 
