402 AUSTRALIAN FREE-LIVIXG MARINE NEMATODES, 



eishth as wide as at the anus, to the naked and swollen terminus 

 which gives exit to the secretions of the caudal glands. The 

 rather inconspicuous vulva leads into a vagina one-third as long 

 as the body is wide. The eggs are two-thirds as wide as long, 

 and as long as the body is wide; they seem to remain unsegmented 

 while in the uterus. The refle.xed part of the ovaries reach three- 

 fourths the way back to the vulva. 



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

 New South Wales, Australia, 



CvATHOLAiMUS MINOR, n.sp. The female remains unknown. 

 t"« q^ ^L q^^ ^I"q i'22mm. The transparent cuticle is crenate 

 when seen in optical section, this appearance arising from the 

 presence of transverse striae, 2-6/Lt apart, resolvable with medium 

 powers into rows of dots. On the lateral fields these dots are 

 arranged longitudinally in four rows occupying a space one- 

 fourth as wide as the body. Circular markings, of unknown 

 significance, very considerably larger than the dots, also occur;, 

 these are arranged on the sides of the body right up to the head, 

 in some parts as if in three irregular rows, in other parts as if in 

 two, one of them irregularly double. I saw no hairs on the body. 

 The neck is cylindroid posteriorly, but anteriorly it becomes 

 convex-conoid and ends in a sub-truncate head, set off by a slight 

 constriction. The ten sub equal spreading cei^halic seta? are one- 

 half as long as the head is wide, and are arranged in the usual 

 manner; they encircle the head opposite the pharyngeal tooth and 

 are so short as to be easily confounded with the six setose papillse 

 which surmount the six lips. The lateral organs are one-half as 

 wide as the head and are so j^laced that their anterior margins 

 are opposite the pharyngeal tooth; the right organ is a left-handed 

 spiral of three and one-half winds, while the left is a similar right- 

 handed spiral. Tha pharynx is 12/x deep, with a dorsal tooth at 

 7/x; the posterior part of the pharynx is very narrow and incon- 

 spicuous; the anterior part is of the form usual in Cyatholaimvs, 

 namely, cup-shaped presenting twehe jointed ribs. The 

 oesophagus is conoid, being in its anterior j^art one-half, and in its 

 posterior part two-thirds, as wide as the corresponding part of the 



