262 



MR. H. A. BAYLIS AND LT.-COL. CLAYTON LANE ON 



The species appears to be widely disti-ibutecl in India, Ceylon, 

 the Mala}^ Archipelago, Australasia, and Africa, and shows little 

 local variation except in size. 



The lips (text-figs. 7 & 8 ; PL III. fig. 11) are large and thick, 

 and somewhat flattened in front as seen in a dorsal or ventral 

 view (text-fig. 7). In very young specimens the shape of the 

 lips is more conical (text-fig. 9). When the lips are viewed from 

 the dorsal or ventral side (text-fig. 7), there is seen on the edge 

 of each tooth a little pointed projection which appears to be the 

 expression of a ridge running along the inner surface of the lip, 

 and recalling the dentigerous ridges met with in certain 

 Ascaridae. 



The head-bulb is large, and is distinctly divided (in mature 

 specimens) into four swellings by longitudinal depressions in the 

 mid-dorsal, mid-ventral, and mid-lateral lines (text-figs. 7& 8; 

 PI. III. fig. 11). In ver}^ young examples (text-fig. 9), measuring 

 from 5 to 7 mm. in length, and in which the lips are not yet 

 fully formed, the head-bulb shows only two swellings, situated 

 dorsally and ventrally. The transverse striations on the head- 

 bulb (in the adult) are discontinued at the depressions which 

 separate the four quarters of the bulb. 



The collar-like cuticular invagination behind the head-bulb is 

 well-marked. The cesophagus occupies about one-fifth of the total 

 length. The cervical sacs are only about one-quarter of the 

 length of the oesophagus, or less. 



In the male the fifth, or adanal, pair of caudal papillae 

 (PI. III. figs. 12 & 13) is the largest. The intervals between the 

 second and third, and between the seventh and eighth, pairs are 

 longer than the rest. The spicules have a small, smooth,, 

 rounded tip, just in front of which the diameter of the spicule is 

 slightly reduced (text-fig. 11). 



In the female the tail (text-fig. 12) is short, straight and 

 conical. The female genital apparatus is highly characteristic. 

 The vulva is situated towards the posterior end of the body, 

 within the last quarter of the total length. The internal organs 

 ^consist essentially of a vagina and four uterine tubes*, leading 

 to four ovaries. The four divisions of the uterus are invariably 

 arranged on the same general plan, three of them passing off 

 towards the anterior and one towards the posterior end. A 

 considerable amount of variation appears to exist, however, in 

 their mode of origin. Sometimes (text-fig. 13) they appear to 

 originate separately from a common narrow stem which is con- 

 tinuous with the vagina — first, the posterior branch comes ofl"" 

 and sooner or la.ter turns back more or less parallel with the 

 vagina ; then a, little further forward one branch comes oflT and 

 runs forward ; and, finally, the common stem bifurcates at its 



* In this connection it is interesting to note tlnit another nematode from a 

 Monitor {Plnjsaloptera varani Parona. 1890 r = P. quadrovaria Leiper, 1908]) al:jo 

 has a four-fold division of the uterus. 



