MOYANITS. 451 



on the anterior somites arise from simple furrows in the general surface ; but oau- 

 dad distinct pinnulae become evident and more and more elevated. The pinnulae 

 of the anterior region are much elongated transversely, the width always much 

 exceeding the length. In the caudal division the pinnulae are narrower and 

 much more elongate, distally flattened in a caudocephaUc direction and some- 

 what expanded; the distal edge straight or slightly convex, and bearing fewer 

 uncini than those of the anterior region, where they are very numerous. 



Between the bases of the two inner anterior branchial filaments is a trans- 

 verse elevation, or fold, which is mesally extended as a broad tongue caudad be- 

 tween the inner posterior branchiae. The branchiae in the type are broken off 

 near their bases. 



The paleae on each side thirteen in number, these increasing in length from 

 the most ectal to the most mesal. Evenly conspicuously curved throughout 

 most of length, and narrowing evenly distad to a slender acute tip. (Plate 77, 

 fig. 1). Length of exposed portion of longest palea, 2 + mm., or nearly as long 

 as the lateral setae. 



The capillary setae in the type about 2.2 mm. long. They are slender and 

 finely acuminate distad. The wings are but slightly developed, being narrow 

 and almost of uniform width and the setae but little wider at middle than at 

 base. The uncini with eight teeth, or seven in addition to the bluntly rounded 

 inferior process. Of these seven the one adjacent to the inferior process is rudi- 

 mentary, being short and fine and occasionally not at all detectable. (Plate 77, 

 fig. 2). 



The tube consists of a wall of greenish black mud over a lining membrane. 

 It is 8.5 mm. in diameter at mouth, with the wall about 1.75 mm. thick. It is 

 distally cylindrical and at bottom subconically narrowed. 



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

 Depth 493 fms. Bottom of green mud. 11 April, 1891. One specimen. 



MoYANUS, gen. nov.^ 



Body elongate and composed of numerous somites. Fifteen somites bear- 

 ing capillary setae. Uncini beginning on the first setigerous somite. Pygidium 

 somewhat campanulate; with a series of papillae. 



Prostomium presenting two conspicuous lobes, a lower, tentacuUferous one 



' Gosiute, mobi, mo-, snout, proboscis, and ya, carry or bear. 



