414 TRICOMA AND OTHER NEW NEMATODE GENERA, 



of motion, and are, therefore, readily recognised. I have seen 

 only the male of one species and the female of a second. The 

 female of L. contortus has two symmetrically refiexed ovaries. The 

 male of L. longus seems to have but a single testicle. There are 

 no eyes. 



_ ^ -4 1-3 2-4 '50-'^^ 97-8 ^, . , 



1. L. CONTORTUS, n.sp. T4 — ^ — Ti ^ ^ 4-7 mm. The cuticlo, 



which bears very inconspicuous hairs throughout, is traversed by 

 very fine plain transverse striae. The cylindrical neck terminates 

 in a truncate head whose anterior margin bears six slender setse, 

 each as long as the head is wide. The spiral lateral organs are 

 circular in appearance ; they are one-fourth as wide as the head, 

 and their anterior margins are opposite the bases of the cephalic 

 setae. The mouth is a shallow depression in the middle of the 

 front of the head, and leads to a straight closed pharynx, indistin- 

 guishable from the oesophagus but for an almost imperceptible 

 pharyngeal swelling, which in its widest part is one-third as wide 

 as the head. The cesophagus is a tube only one-fifth as wide as 

 the neck, but it expands at the posterior end to form a powerful, 

 nearly spherical, sucking bulb three-fourths as wide as the neck. 

 The cardiac collum is distinct, and leads to an intestine w^hose 

 diameter is at first very small, and nowhere exceeds one-third the 

 width of the body. The cells of the intestine are large, two to 

 three building the circumference, and contain numerous brown 

 granules. The rectum is longer than the anal body-diameter. The 

 nature of the ventral gland is unknown to me. The lateral fields 

 are probably one-half as wide as the body. The nerve-ring is 

 oblique. The three caudal glands are confined to the tail, and 

 their secretion has exit at the blunt terminus. The tail is 

 conoid, being about half as wide at the terminus as at the anus. 

 The refiexed portion of the ovaries extends about one-third the 

 way back to the vulva. The thin-shelled eggs are arranged in a 

 single row and fill the body cavity well up ; they are four to five 

 times as long as wide, and are apparently deposited before 

 segmentation begins. Male unknown. 

 Hah. — Marine sand, Bay of Naples, 1888. 



