448 • THE ANNELIDA POLYCHAETA. 



front of this stripe the hp is somewhat elevated along its anterior border. (Plate 

 76, fig. 1, 2). 



The branchiae are broken off at their bases. The inner posterior branchiae 

 are much thickest, the anterior inner ones being next in size. Between the 

 inner anterior branchiae there is the usual transverse fold which extends back 

 as a broad, cuneate tongue between bases of the two posterior branchiae. 



Dorsum strongly convex. It is finely transversely striate. Excepting 

 the first few, the intersegmental furrows are not pronounced between the somites 

 above. The venter is much less convex, flattened. Excepting the first few, 

 the somites of the anterior region below are bisulcate from the caudal edge 

 cephalad nearly across the somite. The anterior margin is angularly extended 

 forward at the middle. 



The notopodia are short and conical. The first ones, as usual, reduced, 

 papilliform, and lying in a furrow which in the type seems to continue caudad 

 along the sides considerably farther than usual. The pinnae are distinct on the 

 fourth and succeeding somites. They are thin, elongate transversely, with the 

 ectal end free and pointed. 



Paleae on each side nineteen, these decreasing in length dorsoectad, as 

 usual, the two most dorsal being finer and almost capillary. As seen from 

 above, the paleae curve moderately and evenly from base to tip. Narrowed to 

 an acute tip which is straight and not much drawn out, being nearly the same in 

 form as in ^. orphnius. Length of longest palea 2.5 mm. 



The capillary setae slender and finely acuminate, with the tips a little 

 curved. Wings narrow. Maximiun length 1.8 mm., being clearly shorter than 

 the paleae. Uncini proportionately longer and narrower than in ^. orphnius and 

 with a correspondingly larger number of teeth, there being uniformly seven 

 of these fully developed and one rudimentary one above the inferior process. 

 (Plate 77, fig. 3). 



Locality. Off Mexico: Sta. 3417 (lat. 16° 32' N. long. 99° 48' W.). Depth 

 493 fms. Bottom of green mud. Bottom temp. 40.6° F. 11 April, 1891. 

 One specimen, with caudal region missing. 



Amphicteis uncopalea, sp. nov.^ 



Plate 76, fig. 5, 6; Plate 77, fig. 4. 



The dorsum is blackish, as is also the venter posteriorly. The head and the 

 venter anteriorly are more bro\vnish. 



' uncus, hook, and palea. 



