1904.] NATURAL SCIENCES OF PHILADELPHIA. 487 



number of stouter ones in the setigerous lobe. A single hooked and 

 guarded aciculus appears ventrally at about the tenth parapodium, 

 and by the twenty-fifth there are two very stout ones (PI. XXXVII, fig. 

 6), and above these a vertical row of four or five less stout but more 

 opaque and deeply colored aciculi, whose ends project freely as acute 

 points which increase in length dorsally where they pass mto the regular 

 series of setae. Just beyond the point of their emergence is a slightly 

 swollen deep brown spot, at which they readily break, indicating the 

 existence of an imperfect joint (PI. XXXVII, fig. 7). The arrangement 

 just described continues to the seventy-fifth somite at least, and prob- 

 ably considerably beyond, but the one hundred and twenty-fifth has 

 two hooked aciculi, only two pointed ones and a single simply bent and 

 unguarded one (PI. XXXVII, fig. 8). 



The jaws (PI. XXXVII, fig. 9) are nearly black and stout. The 

 maxillse have short, broad carriers, not united in the middle, and their 

 bases bear two prominent tubercles. The next dorsal plate bears six 

 or seven stout teeth, the next five on the left and seven on the right 

 side, with a thin edentulous plate on each side. The extra plate on 

 the left side bears seven or eight teeth. The mandibles have the ter- 

 minal piece white and translucent, the carriers deep brown, loosely 

 joined, very broadly rounded at the base and with a prominent longi- 

 tudinal ridge. 



Eunice biannulata n. s. (PI. XXXVII, figs. 10-18; PI. XXXVIII, fig. 42.) ] 



The type and largest example is 137 mm. long and 5.3 mm. between 

 the tips of the parapodia at the widest point. The prostomium is 

 short and broad, the length barely exceeding one-half the width, the 

 anterior border scarcely emarginated, but the anterior lobes or palpi 

 swelling broadly ventrad and laterad, and separated by a distinct 

 median ventral furrow passing backward to the mouth, while a faint 

 transverse groove separates a small anterior from a larger posterior 

 portion. The tentacles arise in a nearly straight transverse line 

 across the anterior portion of the white posterior half of the pros- 

 tomium; the paired tentacles are in contact at their bases and are 

 separated from the median tentacle by a distance about equalling the 

 diameter of the latter. Ceratophores all very low and broad ; styles 

 constricted at the base, increasing gradually in diameter for one-fourth 

 or one-fifth of their length and then tapering regularly to the end, 

 simply articulated at the base, strongly beaded distally, the terminal 

 joints caducious. The first joint is always much the longest, the second 

 very short and often imperfectly differentiated, the others increasing 

 in length more or less irregularly to the end, giving the impression of 



