400 AUSTRALIAN FREE-LIVING MARINE NEMATODES, 



The worm inhabits sea-sand near low-tide mark, Port Jackson, 



New South Wales, Australia. 



^ -7 3-9 9-7 'en-'^" 90- „ 

 Cyatiiolaimus ExiLis, n.sp. f^T"^^ — 2^ 27 Ti) 2'^^""" The 



cuticle of this species is traversed by transverse striiB easily 

 resolvable with medium powers into rows of dots everywhere alike, 

 — not differing on the lateral lines from those elsewhere, as is often 

 the case. The body is destitute of hairs. The cylindroid neck ends 

 in a truncate head bearing ten sub-equal cephalic setse one-fourth 

 as long as the head is wide and arranged in the usual manner. 

 Each of the six lips bears two setose papilla?. The spiral lateral 

 organs, situated opposite the base of the pharynx, are one-half as 

 wide as the head. There are no eye-spots. The twelve-ribbed 

 cyathiform pharynx is in its widest part two-thirds as wide as 

 the head and bears a plainly visible pointed dorsal tooth some- 

 what behind the middle. The conoid oesophagus is anteriorly 

 one-half and posteriorly two-thirds as wide as the corresponding- 

 part of the neck; its lining is not very distinctly to be seen. The 

 intestine, which is separated from the oesophagus by a distinct 

 cardiac constriction, is one-half as wide as the body and tessellated 

 with coarse granules The length of the rectum equals that of 

 the anal body-diameter. ' The unicellular ventral gland lies behind 

 the cardiac region and empties through a ventral pore situated 

 near the nerve-ring; the ampulla is small and ellipsoidal. The 

 tail is conoid from the inconspicuous anus and ends in a convex- 

 conoid sub apiculate terminus one-fourth as wide as the base. 

 The large broad vuha lies in a somewhat depressed ventral area. 

 The vagina is very broad and one-third as long as the body is 

 wide; much chitin enters into its structure. The eggs are four- 

 fifths as wide as the body and twice as long as wide. The uterus 

 contained sub-spherical spermatozoa one-fourth as wide as the 

 body. The reflexed part of the ovaries reached one-third the way 

 back to the vulva. 



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

 South Wales, Australia. 



„ -fl 5-2 20-7 '46-4'^° 78' „^, 

 CyATHOLAIMUS HETERURUS, n.sp. 1-5 3.3 — i- ^r^ 2^ "™- 



The thin skin of this rather remarkable looking: nematode is 



