15 



level of the esophageal l>ull>, shows two longitudinal ventro- 

 lateral granular bands (apparently not cuticular, but due to the 



granular muscles showing through the cuticle). Three nearly 

 e<|iial lips (Fig. -5), each with a ridge from base to tij), this 

 ridge at base, near middle of lip, and at the margin, showing 

 special thickenings. Opposite the intervals between these 

 lips and reaching in eaeh case to near the middle of the lips 

 the cuticle extends forward like an outer set of lips, eaeh with 

 five marginal lobes. On either side of dorsal lip, outside the 

 last-named structures, is seen a more or less tabulate but small 

 cuticular swelling. When seen from the side these various 

 lobate protrusions and the lips give a coarsely fringed appear- 

 ance to the front of the head. The esophagus (Figs. 1 and 4) 

 measuring a little more than 1 mm. in length (including the 

 bulb), is at first nearly uniform in diameter and slender (0.08 

 mm. in diameter), but gradually thickens in flask-like manner 

 until at a level of 0.8 mm. from the lips it has attained a 

 diameter of 0.17 mm., just back of which it contracts, and 

 from this constriction forms a spheroidal bulb (0.2 mm. long 

 and 0.23 mm. in diameter). Transverse section (Fig. 5) 

 shows a triradiate esophageal lumen; within the bulb a 

 three-toothed (?) armature. For about 1 mm. beyond the 

 bulb the intestine is thick (0.2 to 0.25 mm.), after which it 

 narrows (0.15 to 0.1 mm. or less), running a straight course 

 to the anus. In the rectum it again expands in a fusiform 

 manner; and at the posterior portion of this part of the tube 

 are attached several large monocellular anal glands. Anus 

 situated 1.4 mm. from the tip of the tail. Vulva at one- 

 third of body length from the head (2.5 mm. in an 8 mm. 

 example). In all of the specimens the vagina (Figs. 1 and 6) 

 projects as a thick finger-like tube beyond the body wall, 

 covered on the outside with cuticle and with the central 

 lumen surrounded by what seems to be a layer of circularly 

 disposed muscle cells. In specimen of 8 mm. length, this 

 vaginal extension measured 0.4 mm. in length; and in all the 

 rest of the specimens in hand it bears similar proportions. At 

 the distal end it is subdivided, the lumen opening between 



