140 [Assembly 



enlarged (fig. 21), then suddenly become smaller, ending in a deli- 

 cate, almost tiliform appendix. The dorsal cirri of the middle region 

 have one margin crenulated for nearly their entire length (lig. 22) ; 

 the ventral cirri have a few crenulations near their outer end. 



Found living very near high-water mark, and common every- 

 where in the harbor, except in pure sand. 



Xeueis Culveri n. sj). 



PLATE (III), Yl, FIGS. 23-30. PLATE (iv), Til, PIGS. 31, 33. 



Head (fig. 23) emarginate in front ; anterior half of lateral mar- 

 gins concave, posterior half slightly convex ; posterior margin 

 straight ; from the anterior emargination, a deep, triangular depres- 

 sion runs backward to the middle line, so that the front half of the 

 head seems to be divided into two lobes, broadly rounded in front ; 

 length to width as two to three. 



Eyes: anterior pair elliptical or elongate-oval, on the middle line, 

 lateral ; posterior pair circular, a little within the front pair, close to 

 the posterior margin. 



Antennae remote from each other at base, conical, length to length 

 of head as three to four. 



Palpi very stout with long terminal arches, in extension reachmg 

 beyond the antennae, in contraction falling much short of them. 



Proboscis (fig. 24) : it is in the structure of this organ that the 

 chief peculiarities of this species are to be found. There ai"e no 

 paragnathi. At the summit of the maxillary ring are bunches of 

 short, conical, pointed papilla3, arising from low, marginal eleva- 

 tions, with the arrangement as follows : on the middle line above, a 

 small bunch of four or fi,ve papillte ; on the latero-dorsal margin a 

 bunch of ten or twelve arranged in a double series ; on the latero- 

 ventral margin a bunch composed of the same number of papillae, 

 but not arranged in series ; a median ventral bunch, six papillie in 

 double series ; half w^ay between the last and the latero-ventral, a 

 small bunch, three to five papillaa. The lateral papillae, above and 

 below, are about one-third as long as the antennie, the others a little 

 shorter. Aside from these papillae, the surface of the maxillary ring 

 is quite smooth. On the ventral surface of the basal ring, near the 

 posterior margin, are five small elliptical elevations or calluses, a 

 median and two lateral, equally distant from each other. The notes 

 made on the living forms make mention of a small, median, trian- 

 gular papillae, just in front of the antenna?. It cannot be demon- 

 strated in alcoholic specimens. 



Jaws (fig. 25) : m color varymg from light to dark horn-color ; 

 about fourteen strong, sharp teeth. 



Buccal segment double the length of the s6cond segment, equal 

 to the fourth. 



Tentacular cirri (tig. 23) arise from stout and long basal articles ; 

 upper posterior cirrus longest, reaching back to the middle of the 



