BY N. A. COBB. 



415 



2. L. LONGUS, n.sp. Female unknown. 



(?)-M 98-4 



• 5 1-2 

 •5 -6 



4 mm. The finely and plainly striated cuticle 

 The neck and head closely resemble 



•6 -7 



bears hairs throughout 

 those of the preceding species, but the cephalic setae number at 

 least eight (possibly ten), there being two setse of unequal size 

 placed on each submedian line ; the setse are of the same long, 

 slender and flexible structure found in contortus. The lateral 

 organs are manifestly spiral, the left being a right-handed spiral 

 and the right a left-handed spiral ; they are 

 one-third as wdde as the head, and are situ- 

 ated opposite the cephalic setse on the margin 

 of the head. The mouth 

 and pharynx are more 

 pronounced than in con- 

 tortus^ the former being a 

 conoid depression with 

 transverse chitinous rid- 

 ges, and the latter being 



Fig. 11. — I, male of Laxus 

 longus. II, III, IV, and V, 

 the head, neck, tail-end, and 

 anal region of the same more 

 highly magnified. 



situated in a swelling more 



a, hind end of CBSophagus. 



b, cephalic seta. 



c, pharjnx. 



d, left lateral organ. 



e, pharyngeal bulb. 

 /, lateral organ. 

 g, pharyngeal swelling. 

 h, oesophagus. 

 i, nerve-ring. 



j, outlet for caudal glands. 

 k, cardiac bulb. 

 I, blind end of testicle. 

 m, intestine. 



n, proximal end spiculum. 

 0, accessory piece. 

 p, q, postanal ventral papillae. 



than one-third as wide as 

 the neck. The oesophagus 

 is one-fourth as wide as 

 the neck, and expands pos- 

 teriorly into a spherical 

 bulb three-fourths as wide 



as the neck. The cardiac collum is distinct- 

 The intestine, one-half as wide as the body, 

 is composed of cells of such a size that two 

 to three build the circumference; as in contortus, the cells contain 

 brown granules. The nature of the ventral gland is unknown to 

 me. The lateral fields are one-third as wide as the body. The 

 nerve-ring, as in conto7'tus, is oblique. The ventrally-arcuate 

 conoid tail has a blunt rounded terminus, and presents five pairs 

 of equidistant hairs on the ventral surface of the middle part. 

 At the same distance from the anus, but in front of it, occur also 

 five or six similar pairs of hairs. The two equal linear spicula 



