MONTGOMERY: GORDIACEA. o7 
7. G. leidyi, n. sp. 
Figs. 53-55, Plate 7; Figs. 56-59, Plate 8. 
(1 female, type: Leidy coll. 5089, no data.) 
Form. Head (Fig. 53) conically pointed, obtusely rounded at the tip, where 
the mouth opening is terminal and forms a slight projection. Body cylindri- 
cal, with deep dorsal and ventral grooves, the ventral one not quite in the 
median plane. Posterior portions of the body for a distance of about 12 mm. 
slightly flattened horizontally, and of slightly less diameter than the middle of 
the body. The dorsal groove of the head extends nearly from the head to the 
posterior end of the body; the ventral groove ends about 5 mm. in front of 
the posterior end. Posterior end (Figs. 56-58) truncated, almost vertically. 
Cloacal aperture (Fig. 57) terminal, nearly in the centre of the disk which 
forms the distal face of the posterior end. This aperture is placed upon a 
round, elevated papilla, the latter sunk in a depression of the distal face of the 
body. To each side of the cloacal papilla is a short vertical, elevated integu- 
mentary ridge, while below the depression in which the cloacal papilla lies is a 
transverse ridge. On the dorsal side of the posterior end (Fig. 56) is a nearly 
U-shaped integumentary fold, to each side of which is an elongated pit or 
depression. The latter pits lie respectively on the dorso-lateral sides of the 
posterior end of the body, and extend posteriorly as far as the vertical tegu- 
mentary ridges which form the lateral boundaries of the depression in which 
the cloacal papilla is situated. The distal end of the dorsal U-shaped fold 
forms a transverse ridge bounding dorsally the depression in which the cloacal 
papilla lies. The dorso-median groove of the body extends on the surface of 
this fold to the posterior end of the latter, the groove being broadest at this 
point. Thus the posterior end of the body is vertically truncated, with a con- 
cave distal face ; in the centre of this depression, situated on the summit of a 
slightly elevated papilla, lies the cloacal aperture ; the outlines of this terminal 
concavity of the body form nearly a square, its boundary being two short 
vertical ridges, a transverse ventral ridge, and a transverse dorsal ridge which 
is the distal end of a U-shaped fold of the integument situated on the dorsal 
side of the end of the body. These relations are somewhat complicated, and 
may be best understood by reference to the Figures 56-58. 
Cuticle. Areolated ; areole (Figs. 54, 55) only slightly elevated, on cross 
section they show no hyaline summit, irregularly polygonal in outline ; they 
are usually elongated in the line of the transverse axis of the body, and show 
a tendency to form short and interrupted rows or chains, contiguous areoles in 
‘such rows being confluent. The areole are separated only by narrow spaces. 
The cuticle is also marked by intersecting elevated lines (Fig. 59) placed at 
considerable but varying distances apart, these lines being easily visible on the 
alcoholic specimen. Interareolar bristles are absent. 
Color. Head end light yellowish brown, the rest of the body a deep yellow- 
ish brown color, with an obscure dusky brown ring on the head. In the 
VOL. XXXII. — No. 3. 2 
