1903.] NATURAL SCIENCES OF PHILADELPHIA. 471 



Parapodia represented by small, simple neuropodial and notopodial 

 tubercles united by a slight transverse ridge. But very few of the 

 branchiae remain and the scars are so obscure that the arrangement 

 at the anterior end cannot be determined with certainty ; for the greater 

 part of the anterior f of the body a pair springs from each somite just 

 above the notopodial tubercles but toward the end of the branchial 

 region the arrangement becomes somewhat irregular, the branchise 

 usually occurring at intervals of 2 or 3 somites -without change in 

 position. 



The notopodial and neuropodial tubercles each bears a tuft of 15-20 

 very soft elongated slender capillary setse of a pale greenish color and 

 homogeneous vitreous structure; many of them exhibit an indistinct 

 flattened region of greater or less extent which appears more of the 

 nature of an accidental crushing than a normal structure. These setae 

 are exceedingly fine and long, very nearly equalling ^ the diameter even 

 of the much contracted body, and appear to the naked eye as conspi- 

 cuous tufts of very fine whitish hairs. At the posterior end they are 

 somewhat shorter but not enlarged or otherwise different. Compared 

 with the capillary setae of C. spinosa those of this species are less than 

 f the diameter and fully h longer, much softer and under an equal 

 magnification lack altogether the surface markings of that species. 



Suruga Bay, 3,726, 26 fms.; Sendai Bay, 3,767, 14-18 fms. 



TEREBELLID^. 

 AmpMtrite bifurcata sp. nov. (PI. XX VI. fig. 78.) 



The type is 70 mm. long and 7.8 mm. in maximum diameter, and 

 consists of 59 somites. 



Prostomium a long prominent somewhat horse-shoe-shaped lip with- 

 out complicating folds, but slightly rolled up and bent back against 

 the bases of the tentacles, behind which there is a low transverse ridge. 

 No eyes. Tentacles long, longitudinally grooved, in a continuous row 

 of about 22. 



Peristomium a short simple ring, with a slightly free ventral margin 

 which covers the special lower lip. and no dorsal papillae or compli- 

 cating structures. Mouth large, with a wide lower Hp besides the peris- 

 tomium. 



The body, as usual in this genus, is somewhat enlarged anteriorly, 

 more slender posteriorly, and throughout its length strongly arched 

 above and flat or concave below. Segments not very distinctly indi- 

 cated and, except for a few biannulate anterior ones, only obscurely 

 annulated. Somites II, III, and IV ^^•ith their anterior margins more 



