300 THE ANNELIDA POLYCHAETA. 



anterior end in the more usual way instead of being specially stout. The palpi 

 are shorter and not at all bilobed. The lower lip is not bilobate. The peri- 

 stomium is much shorter in comparison with somite II. The somites in general 

 are distinctly longer in proportion, somite V being only from three to three and 

 four fifths times wider than long as against six times wider in hiatidentata. The 

 branchiae begin on the fourteenth parapodia instead of on the thirteenth (or 

 twelfth), and the first ones are shorter than the notocirri instead of equalling 

 them. The crochets of the anterior parapodia are conspicuously different so far 

 as Moore's account of hiatidentata shows, for they are distinctly compound and 

 the superior tooth is much more elongate. Two crochets appear in each para- 

 podium beginning with X in this species, but not until XV in hiatidentata. The 

 pectinate setae differ in the presence of the conspicuous angular flaps at the 

 distal corners. 



Onuphis cobra, sp. nov.^ 

 Plate 52, fig. 1-8. 



The general color is a dark dusky brown, with the appendages somewhat 

 paler. On the ventral surface the glandular areas along each side are pale, as 

 usual, as are also a number of infraganghonic spots along the midventral line. 



None of the type-specimens is wholly complete, though both anterior and 

 posterior ends are present. In the two fragments representing the paratype 

 there are thirty-one (anterior) and thirty-nine (posterior) somites respectively, 

 the two fragments in length measuring respectively 27 and 21 imn. The great- 

 est width, exclusive of the parapodia, is 4 mm. 



The prostomium is broad and well exposed, the tentacles being all distinctly 

 removed from the edge of the peristomium. Anteriorly it bears the two cushion- 

 like palpi, which are longest dorsoventrally, thickest at the ventral end, and 

 well separated from each other. The frontal tentacles are very low and rounded, 

 inconspicuous, and scarcely separated at the middle. Between the furrow 

 separating off the frontal tentacles above and the bases of the dorsal tentacles 

 the prostomium is somewhat complanate. The dorsal tentacles are arranged 

 somewhat in a semicircle, the median being farther caudad, from this each 

 posterior lateral being well separated by about the diameter of the ceratophore. 

 Each anterior lateral tentacle is inserted much nearer to the posterior lateral 

 than the latter is from the median, and is but little ectad or directly cephalad 

 of it, being attached at the cephaloectal border of the peristomium. The cera- 



' Portuguese for Cobra de eapello. 



