BY N. A. COBB. 



409 



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

 New South Wales, Australia, 1893. 



yil. Bathylaimus, new genus. 



This genus is apparently related to Oncholaimus. The mouth- 

 cavity is large and two-chambered, the posterior chamber being 

 much the smaller, but there is an entire absence of the teeth 

 characteristic of O^icliolaimus. The lips are converted into 

 powerful grasping organs armed with tactile hairs. The three 

 caudal glands are small, and are confined to the tail. The rather 

 short equal spicula are enlarged at the distal extremity and slide 

 in guides of unusual size. The ductus empties through a distinctly 

 chitinous outlet. The testicle has a segmented appearance 

 owing to the peculiar way in which the spermatozoa are developed. 



B. 



AUSTRALIS, n.sp. 



•3 17- 



,20 



94- 



The thin trans- 



1-4 1-6 1-8 2-4 -9 -^ "" 



parent skin is destitute of strise, but bears hairs 



throughout the length of the worm, those on the 



head and at the end of the tail being the more 



conspicuous on account of 



their greater length. The 



conoid neck terminates 



in a head somewhat 



rounded in front and 



bearing, somewhat in 



front of the middle of 



the anterior part of the 



pharynx, twelve setse 



arranged as follows : one 



long one on each lateral 



line ; a long one and a 



short one on each of the 



four submedian lines. 



The larger of these setae arc 



than the head is wide. Each of the three 



lips is bidentate at the extremity, and armed 



just below the summit with two curved hairs which project forward 



Fig. 9.— I, male of Bathy- 

 laimus australis. II, III. 

 and IV, the head, tail, and 

 anal region of the same worm 

 more highly magnified. 



a, labial setse. 

 &, cephalic setse. 



c, pharynx. 



d, nerve-ring. 



e, excretory pore. 

 /, lateral organ. 

 g, posterior chamber 



pharynx. 

 h, blind end of testicle. 

 i, anus. 



j, three caudal glands. 

 k, hairs at terminus of tail. 

 I, posterior end of testicle. 

 m, beginning of cloaca oi 



rectum. 

 n, proximal end of spiculum 

 0, q, accessory piece. 

 p, anus. 



of 



somewhat longer 



