BY N, A. COBB 



157 



The two equal, strongly arcuate, acute, linear spicula, which are 

 a little longer than the anal diameter, terminate proximately in a 

 distinct expansion, and are supported by a single accessory piece 

 one-third as loug, situated behind them and curving backward. 



Hab. Mediterranean Sea. I have not seen this species. 



3. Dipeltis typicus, n. sp. - 6 ~r ? i4 2- 'i- r9mm - is the formula 

 for the only female seen. The sexual organs were undeveloped, 

 and their character and the position of the sexual opening remain 

 unknown. The cuticula is traversed by about one thousand eight 

 hundred and fifty transverse striae so fine and obscure as to escape 



notice with ordinary powers. The 

 head is armed with stout arcuate hairs 

 arranged in four submedian rows of 

 about a dozen hairs each. These rows 

 extend backward to the region of the 

 eye spots. The complex oval-shaped 

 lateral organs are somewhat longer 

 than the head is wide and one-half as 

 wide as long. The mouth cavity is 

 very small, and seems to be armed 

 with a minute labial spear. The oeso- 

 phagus is at first only one-fourth as 

 wide as the neck, but as it passes 

 backward it gradually increases in 

 diameter and becomes at last, that is 

 to say somewhat behind the oblique 

 nerve-ring, one-half as wide as the 

 neck. The intestine is about three- 

 fourths as wide as the body. The 

 rectum "is only two-thirds as long as 

 the anal diameter. The conoid tail is 

 ventrally arcuate and ends in a conical 

 outlet for the three caudal glands. 

 The large unicellular ventral gland 

 lies as far behind the cardiac collum 



Fig. 9.— i. The Male ok Dipeltis 

 TYPICUS (x40); ii, in, and iv, the 

 anal region, head and tail end, 

 respectively, of the same worm, 

 more highly magnified (n, x 3fi0 ; 

 in, x 450 ; iv, x 350). i, shows, in 

 the upper part, the oesophagus 

 surrounded by the uorve-ring 

 (white- and the unicellular excre- 

 tory organ and its duct (hoth 

 hlack) ; near the middle of the 

 hody the two (?) testicles (light). 



