12 



Cobb -Nematodes, mostly Australian and Fijian. 



innervated, on the anterior third of the tail, the posterior pair being near the end of 

 the anterior third and the other pair half-way between that point and the anus. 

 There are other papillae (?) faintly visible on the dorsal side of the tail and elsewhere. 



Hab.—'Rooij9. of plants, damp soil. Moss Vale, New South Wales. 



2-6 7. 23- '62-' 



13. M. longicaudatus, n.sp. 2-2 i-i 3-2 s-r — f9 



1-6 to 1-9 mm. 



Behind the nerve-ring the 

 neck is conoid; but anteriorly it becomes slightly convex-conoid. The small elliptical 

 lateral organs are placed close behind the outer 

 row of papillae, their long diameter being placed 

 transversely ; when seen in profile they appear 

 as slits from which a process is seen to pass 

 inward and backward. The pharynx, which is 

 three-fifths as wide as the head and three times 

 as long as wide, bears a rather small dorsal 

 tooth near the middle, and very inconspicuous 

 rudimentary projections on the ventral side. 

 The vestibule is shorter than usual. The oeso- 

 phagus is three-fifths as wide as the neck, its 

 lumen being conspicuous because of the thick- 

 ness of the chitinous lining. The cardia is 

 large and well developed, and the intestine, 

 which is four-fifths as wide as the body, is com- 

 posed of cells of such a size that about twelve 

 are required to build up the circumference. 

 The concave-conoid rectum is as long as the anal body-diameter. The lateral 

 fields are one-seventh as wide as the body. The tail tapers most rapidly in the 

 anterior half ; posteriorly it is one-fifth as wide as at the anus. The reflexed ovaries 

 extend half way back to the inconspicuous vulva and each contains fifteen to- twenty 

 eggs arranged about three abreast. The eggs are one and one-half times as long as 

 the body is wide and one-half as wide as long. Segmentation appears to begin before 

 the eggs are deposited, — at least in one case I observed an (s,g^ that had formed the 

 first two blastomeres while yet in the uterus. 



Hab. — Blanched part of celery, abundant, Sydney, N.S.W., Australia. 



a, mouth. 



h, labial papilla. 



c, lateral organ. 



d, dorsal tooth. 



e, excretory pore. 

 /, nerve-ring. 



g, pharynx. 



h, pharyngeal muscles. 



i,j, CESophagus. 



h, cardiac region. 



I, intestine. 



m, labial papilla. 



71, lateral organ. 



0, ovum. 



p, dorsal tooth. 



q, pharynx. 



r, egg with shell. 



s, vulva. 



t, blind end of posterior ovary. 



u, bend in ovary. 



0, anus. 



w, three caudal glands. 



X, one of tvpo papillae on the end 



of tail. 

 y, outlet for caudal glands. 



Fig. 2. — 1, female Mononchus longiccmdatiis ; 

 II, side view of head of same worm ; III, ventral 

 view of head of same worm ; IV, end of tail of same 

 worm. 



14. M. truncatus, Bastian. 



2-5 ? 26- 50+ 86- 



3- ? 



5-3 3-4 



1 76 mm. The elongated pharynx is one- 



third as wide as the head, the blunt dorsal tooth being situated near its middle. 

 The intestine is three-fourths as wide as the body and the rectum is two-thirds as 

 long as the anal body-diameter. Tail in the anterior two-thirds conoid, thence 

 cylindrical and one-fourth as wide as at the anus. ^'^ \ ^f f ^f 2- mm. The male tail 



