150 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.2 



V-shaped, 0.052 mm. wide by 0.075 mm. long; its tip is directed later- 

 ally, never ventrally. 



Female: Vulva slightly anterior mid-body. Muscular vagina and 

 ovejector; divergent uteri connected to ovejector by a common uterine 

 stem. Eggs thin-shelled, asymmetrically flattened ; average size 0.087 

 by 0.192 mm.; segmented in utero. 



The species name refers to the small lips. 



Affinities: The structures which distinguish this species from A. 

 alaeuris are: the prebulbar position of the excretory pore, the longer 

 (0.030 mm.) eggs, the much longer spicule, an accessory piece nearly 

 twice as long, the indistinct cephalic region, the inconspicuous lips, 

 two pairs of circumcloacal papillae instead of three, and the character 

 of the cloacal lips. 



It may be distinguished from A. iguanae on the basis of its larger 

 size, the prebulbar excretory pore, the absence of tooth-like processes 

 along the inner edge of the lips, the presence of the common uterine 

 stem, the character of the circumcloacal papillae, the longer spicule, 

 and the longer accessory piece. 



The characters which differentiate this species from A. hirsutus are 

 its smaller size, the indistinct cephalic region, the inconspicuous lips, 

 the greater number of cephalic papillae, the extension of the tail pos- 

 terior to the caudal alae, the character and disposition of the circum- 

 cloacal papillae, the shorter spicule, and the longer accessory piece. 



This species may be distinguished from A. conspicua by the absence 

 of lateral alae, the inconspicuous lips, the greater number of cephalic 

 papillae, the structure of the esophagus, the prebulbar position of the 

 excretory pore, the more anteriorly situated vulva, the absence of the 

 spike on the male tail, and the shorter spicule. 



The characters which distinguish this species from A. galapagensis 

 are the following: the indistinct cephalic region, the inconspicuous lips, 

 the number of cephalic papillae, the absence of cuticularized projec- 

 tions on the anterior end of the esophagus, the more anterior position of 

 the vulva, the differences in the genital papillae, the greater length of 

 the spicule, and the laterally directed tip of the accessory piece. 



This species may be distinguished from A. longispicula on the basis 

 of the indistinct cephalic region, the inconspicuous lips, the number and 

 position of the cephalic papillae, the much shorter spicule, the shape and 

 direction of the tip of the accessoiy piece, the number of genital papillae, 

 and the differences in the cloacal lips. 



