49 



The following description is based upon a study of the 

 single perfect s|)eciiiieii. The worm is evlindrical in section, 

 .">() inin. in length and !.."> nun. in diameter at its thickest level 

 (in third fourth of the body length), ta|>criiig anteriorly 

 gradually to a rather bluntly rounded head O.L'.") nun. in 

 diameter at base of lips, and tapering [xisteriorh more 

 rapidly to terminate in a straight, acutely conical tail. When 

 received the specimens were colorless, with brownish lines 

 of the intestine showing through the relatively opaque and 

 thick IM><IV walls. Cuticle transversely striated; no alar 

 expansions or other cutirular peculiarity. There are three 

 thick and prominent lips ( Fig. 3), each with two papillse; 

 well-marked interlabia. Lips free from dentieulation, 

 nearly symmetrical and equal. Dorsal lip (Figs. 1 and 2) 

 four-sided, the anterior border deeply divided ; groove of saddle 

 deep and prolonged well to base. Anterior border projecting 

 well beyond the pulpaon each side of saddle (likea finger-nail), 

 its anterolateral angles anriculate (the lateral border being 

 infolded and causing the angle to project slightly forward 

 and laterally). Lateral bonier a double curve, concave 

 anteriorly and convex posteriorly; apparently the entire 

 margin infolded. Base about equal to anterior border of lip. 

 Median impaired lobe of pulpa extends from base about half- 

 way to anterior margin of lip; two paired lobes, the inner large, 

 its inner border straight and parallel with saddle-groove, its 

 outer border broadly rounded to the tip, which is directed 

 forward and slightly medianly. The outer lobule, more 

 slender, extends further anteriorly, is undivided, and is 

 directed anteriorly and toward the median line. Interlabia 

 large, the margins infolded. Width of dorsal lip at base, 150 

 micrornillimeters; width of anterior margin, 140 micromilli- 

 meters, distance from base to anterior margin, 110 micro- 

 millimeters. Esophagus long and slender, provided with a 

 small and inconspicuous bulb at its posterior end, this latter 

 with a posteriorly directed, finger-like diverticulum. Intes- 

 tine at its beginning provided with a large, anteriorly directed, 



