ONUPHIS COBRA. 301 



tophores are distinct and but rather weakly annulate, three or four annuli being 

 present. The styles are as thick at base as the ceratophores and gradually taper 

 to the distal end; they are wholly smooth and unjointed. Each tentacle of the 

 anterior pair reaches the second somite. Each of the posterior paired tentacles 

 reaches the tenth somite, or near that, the exact point being in doubt because of 

 the difficulty of uncoiling the style. The ceratophore of the median tentacle 

 is longer and stouter than those of the laterals; the style reaches the twelfth 

 or thirteenth somite. 



The peristomium is short, being but little more than half the length of the 

 prostomium, and only about a third as long as the second somite. The anterior 

 margin above is nearly straight. On each side it curves moderately broadly 

 forwards and is slightly notched at a point from which a wide furrow extends 

 caudad. The lower lip is triangular, with the apex caudad, and is much wider 

 than high ; it is set off on each side by a deep furrow extending from the anterior 

 border on each side caudomesad; the anterior margin is nearly straight, with a 

 slight notch at the middle, from which a weak median longitudinal furrow extends 

 to the caudal end. The surface above is smooth. The tentacular cirri are 

 attached caudad of the anterior margin but in front of middle of length, each in 

 line with the corresponding posterior paired tentacle; each cirrus is very slender 

 and tapered and is long, extending beyond the attachment of the other cirri, or 

 forward to a little beyond the anterior margin of the prostomium. 



The first metastomial somite is wider and much longer (aV. three times) 

 than the peristomium and is, as usual, widest across the anterior end, where it 

 is a little less than two and a half times as wide as long. The second metastomial 

 somite is about three fourths as long as the first, and is three times wider than 

 long. The third is somewhat shorter than the second, while the fourth and suc- 

 ceeding ones are abruptly decidedly shorter than the third, the first three meta- 

 stomials and the prostomium being set off more or less as a distinct region of 

 the body. The somites increase in width to the tenth or twelfth, in which the 

 width is almost five times the length. The succeeding few somites decrease 

 rather rapidly in width, and thereafter the body remains nearly of uniform width 

 to the caudal region, in which a more rapid decrease again occurs. Dorsally 

 the somites are well arched and ventrally flattened. The anus is distinctly 

 dorsal in position; it is surrounded with a broad elevated rim crossed by numerous 

 deep radial furrows. Below the anus are attached two long, smooth, and slender 

 anal cirri which, when drawn forward, reach almost to the tenth or twelfth somite 

 from the anal end. 



