,712 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. [14] 



The palpi are large, swoUen at base, united along their inner two- 

 thirds, then becoming somewhat flattened, and with their outer angle 

 prolonged into a delicate conical cirrus (fig. 18). As noticed above, 

 they cannot be seen in a dorsal view, being always turned directly down- 

 ward. 



The dorsal cirri are exceedingly variable in form, structure, and length. 

 They may be conical or clavate ; wrinkled irregularly (fig. 17) ; artic- 

 ulated with each article divided longitudinally (fig. 20) ; articulated 

 without the longitudinal division ; or nearly smooth (fig. 19). Their 

 length may be less than the width of the body, or three times the width. 

 All these variations occur on the same specimen, and without any ap- 

 parent order. 



The ventral cirri arise near the end of the foot (fig. 21), are short 

 (relatively) on the first foot, but lengthen rapidly, becoming very long 

 on the fourth segment. They are irregularly wrinkled, often with a deep 

 constriction at the outer third or fourth. They are larger at base than 

 the dorsal cirri of the same segment, and taper regularly to a bluntly 

 rounded apex. They usually are directed backward, but often are coiled 

 (fig. 20). They retain their length even on the posterior segments, and 

 are there longer than the dorsal cirri. There are three anal cirri (fig. 

 19) ; a median, which may be as long as the ventral cirri, and two lateral, 

 three to four times as long. 



The anal segment is much narrower than the segment preceding it, 

 convex above and below, margin regularly rounded. 



The setae are of two kinds. In every bundle there is one long simple 

 seta (fig. 23), straight or slightly curved, bluntly rounded at its apex, 

 where it is covered with a membrane, which is prolonged along the seta 

 for nearly one-fourth of its length. This seta is always in the upper 

 part of the bundle ; in length it is about the same as the stem of the 

 compound setae. 



The compound setne are numerous, crowded, the terminal jjart of the 

 stem divided into four distinct processes or lobes, between which the 

 appendix is inserted (fig. 22). The length of the stem is always about 

 equal to the length of the foot, and as the anterior feet are shortest, so 

 also are the stem iiarts of the anterior setfe. The appendix on the anterior 

 segments is very short, about one-half as long as the one figured, but not 

 differing otherwise. In all the bundles a few of the short forms occur, 

 but do not make up the bundle, as they do on the anterior segments. 

 The appendix is covered with a membrane, which is prolonged down the 

 sides. The oesophagus and stomach have about the same length and 

 diameter, occupying together twelve segments. The oesophagus is- 

 strongly convoluted. The "glands" of the stomach are hexagonal, the 

 rows very numerous ; a small part of the anterior end of the stomach is 

 without them. There are no special glands back of the stomach, but 

 it is simi)ly reduced in diameter, and prolonged into the intestine. The 

 body is strongly convex above 5 less so below. The first segment is 



