BY N. A. COBB. 417 



These cells contain large dark-coloured granules, to which fact is 

 due the blackish hue of the living worm. The ventral excretory- 

 pore is situated considerably behind the nerve-ring, the distance 

 from the ring to the pore being about half as great as the 

 distance from the pore to the cardiac region. There is a rather 

 large ampulla and a widish duct ; I could not make out the 

 position of the gland of which they are the outlet. The tail is 

 conical and slightly ventrally arcuate. I saw no caudal glands. 

 There is no bursa or supplementary sexual organs other than 

 several tactile hairs situated on the ventral side of the anterior 

 half of the arcuate and conical tail. The two equal acute linear 

 spicula are strongly arcuate and of nearly uniform diameter in the 

 proximal half, but taper gradually to a point in the nearly straight 

 distal half. They are twice as long as the anal body-diameter, or 

 one-third as long as the tail, and are supported in action by 

 accessory pieces having a process extending obliquely backward 

 from near the anus. 



Hab. —MsivmQ sand, Bay of Naples, 1888. 



"2 1*2 2"3 78 99'7 



2. C. PUEPUREA, n.sp. :3 — ^ — tq tq :j 7-46 mm. The strise 



if present are excessively tine. Hairs occur throughout the 

 length of the body, but are conspicuous only near the extremities. 

 The neck tapers a little more than in nigricans, and ends in a 

 somewhat more distinct mitriform head, the constriction behind 

 the lateral organs being quite noticeable. The cephalic setae are 

 arranged in two rows, the posterior row of four submedian setae 

 surrounding the head just in front of the large circular lateral 

 organs, and the anterior row of eight being much nearer the 

 mouth, and being placed so that two of unequal size occur together 

 on each submedian line. The setae are shorter, stouter and stifFer 

 than in nigricans, the largest of them being only half as long as 

 the head is wide. The lateral organs are four-fifths as wide as the 

 head. The mouth does not project, and the lips are very inconspi- 

 cuous. The apparently unarmed tubular pharynx extends back as 

 far as the posterior margins of the lateral organs. There are no 

 eyes. The tubular oesophagus is onl}'- one-fourth as wide as the 

 neck, but gradually expands in its posterior fourth so as to form 



