404 TRICOMA AND OTHER NEW NEMATODE GENERA, 



be situated near the broad and oblique nerve-ring. The anterior 

 half of the tail is conoid ; thence it is narrow and cylindrical, 

 being about one-eighth as wide as at the slightly elevated anus. 

 The terminus, which is only very slightly swollen, bears three long 

 hairs near the outlet of the caudal glands. The region about the 

 vulva is slightly elevated. The vagina is four times as long as 

 the body is wide. The eggs, which are three times as long as the 

 body is wide and only one-fourth as wide as long, are deposited 

 before segmentation begins. The spermatozoa seen in the uterus 

 appeared to be spherical and one-fourth as wide as the body of 

 the female. 



Hah. — Found in sea-sand near low-tide mark, Port Jackson, 

 New South Wales, Australia, 1893. 



1- 9- 24- —65- 82- „, , 



3. M. LATA, n.sp. 2-2 3-3 — I- 5^ — s"- i'^^™"^- The transversely 



striated cuticle of this plump and graceful little worm bears 

 throughout the length of the body none but short and incon- 

 spicuous hairs. The truncate head surmounts a conoid neck, 

 from which it is set off by slight expansion. The circle of 

 cephalic setee is arranged somewhat behind the anterior margin 

 of the head, each seta being about two-thirds as long as the head 

 is wide. The mouth is surrounded by six large transparent 

 confluent lips, each of which bears a papilla. Circular lateral 

 organs, one-fourth as wide as the head, are placed on the neck at 

 a distance from the anterior extremity equalling their own width 

 four times over. The oblate anterior and larger part of the 

 pharynx has a depth half as great as the diameter of the head ; 

 thence the pharynx tapers abruptly. The oesophagus, which is 

 one-half as wide as the neck, and whose lining when seen in 

 optical section presents a sinuous appearance, is separated from 

 the brownish intestine by a distinct cardiac constriction. The 

 cardiac region being transparent, the large cardia can be distinctly 

 seen, and behind it a rather distinct cardiac cavity. The intestine, 

 whose cells are packed with granules giving rise to a rather dense 

 tessellation, often contains among other vegetable matter a quan- 

 tity of diatoms. From the depressed anus the tail, which bears a 



