342 PROCEEDINGS OF THE ACADEMY OF [June, 



Station 4,548, Monterey Bay, June 7, 46 fathoms, coarse sand, shells 

 and rock. 



Eumida tubiformis sp. nov. PL XVI, figs. 22, 23. 



All of the specimens are contracted and in this state are depressed 

 and stout, with the segments much crowded, particularly at the 

 anterior end. The type, a female with 137 segments, is 67 mm. long, 

 with a maximum body width of 3.1 mm. and a width between tips of 

 parapodia of 4.5 mm. A male with 104 segments is 37 mm. long, and 

 a small portion of the anterior end of a very large example measures 

 7 mm. between the tips of the setae. 



Prostomium in the several specimens varying in degree of contraction 

 and proportions, in the type and most of the others being nearly twice 

 as wide as long, subelliptical, slightly concave posteriorly and with a 

 tentaculiferous prominence in front, the prominent lateral ocular lobes 

 resting upon the peristomium. One specimen has the prostomium 

 subtriangular and only about one-fourth wider than long. In life it 

 would probably be broadly cordate. Eyes one pair, very large, about 

 one-fourth, or somewhat less, the width of the prostomium, with large 

 lenses looking upward. Immediately behind and below them are the 

 small nuchal sense organs. 



Frontal tentacles arising close together on front of prostomium 

 separated by a distance of about one-fourth width of prostomium, 

 all subulate with basal half thickened and beyond that abruptly tapered 

 to very slender tips, subequal or the ventral pair somewhat longer, 

 slightly exceeding one-half width of prostomium. Median tentacle 

 arising from a slight depression between lenses of eyes, not abruptly 

 thickened at base, more slender and slightly longer than frontal 

 tentacles. 



Peristomium much shortened, crowded beneath prostomium, not 

 visible as a distinct segment from above ; somites II and III also much 

 shortened and crowded. Tentacular cirri with well-developed cirro- 

 phores and large stout subulate styles shaped like the median tentacle 

 but very much larger. Dorsal and ventral of II widely separated, the 

 ventral being at nearly the level of the notocirri of succeeding somites. 

 The single pairs of I and III lie opposite the interval between those 

 of II, the peristomial being at the higher level. That of I reaches VI, 

 ventral of II reaches VIII and dorsals of II and III reach IX. 



Body of very uniform diameter, being perhaps widest at about XL, 

 thence tapered very gradually and regularly caudad. Owing to the 

 maimer in which the notocirri are imbricated an aspect of rather strong 

 depression results, but the body is really very little depressed. Seg- 



