ART. 12 A NEW LIVER FLUKE FROM A MONKEY — SANDGROUND 5 



Family TRICHOSTRONGYLIDAE 



LEIPERIATUS, new genus 



Generic diagnosis. — Trichostrongylidae : Dorsal lobe of bursa 

 reduced. Two spicules, with relatively massive, ridged, proximal 

 proportions, and with flexible, filiform terminal appendages. 



Type species. — Leiperiatus hopTceni (Leiper, 1910) new combination. 



LEIPERIATUS HOPEENI (Leiper. 1910), new combination 



Synonym. — Nematodirus hoplceni Leiper, 1910. 



Specific diagnosis. — Leiperiatus: In the preserved state the worms 

 are of a greenish yellow color. The cuticle is finely striated trans- 

 versely, and there is also a series of a dozen or more longitudinal 

 lines extending the entire length of the body. The cuticle of the 

 head is not inflated. The head is about 24)u wide at the extremity. 

 The mouth cavity is surrounded by four papillae, two subdorsal and 

 two subventral, and a pair of amphids, laterally. The amphids, 

 which are well developed, are considerably larger than the papiflae, 

 which are minute and inconspicuous. The buccal cavity is very 

 shallow and into it there projects a very definite, although at times 

 obscured, cuticularised spine, about 6.5/x long, which arises from the 

 floor of the mouth. The esophagus, of the typical trichostrongyle 

 type, widens only slightly posteriad. It is about one-twelfth of the 

 body length in the male and about one-ninth of the body length in 

 the female. The nerve ring embraces the esophagus anteriorly in 

 the first quarter (0.28 mm. to 0.32 mm. from its anterior end), and 

 at the same level the excretory tube opens by a fine duct on the 

 ventral surface. Cervical papillae were not observed in the material 

 at hand. They may be present as minute acicular points, which 

 are stated by Leiper to project 0.4 mm. behind the nerve ring. 



Male. — 12 to 13.4 mm. long with a maximum thickness of 0.23 mm. 

 The bursa consists of two symmetrical lateral lobes united by a small 

 unindented lobe, dorsally. The lateral lobes are figured, seemingly 

 over the entire internal surface, with macular markings arranged to 

 form a delicate mosaic design, and their posterior margins are finely 

 scalloped by the cuticular striae which are quite conspicuous in this 

 region. The small dorsal lobe is supported by a single dorsal ray, of 

 proportionately reduced dimensions, which bifurcates near the middle 

 of the lobe. Each of the bifurcations terminates in two minute 

 digits which are slightly curved and extend to the margin of the lobe. 

 The lateral lobes are supported by six rays of which the latero-ventral 

 and ventro-ventral, as seen in the normal condition of the bursa, 

 appear to be closely approximated, but when the lobes are spread out 

 it is seen that the tips of these rays are well separated. The three 

 lateral rays are parallel; the postero-lateral is the smallest and the 



