722 PROCEEDINGS OF THE ACADEMY OF [NoV., 



more distinctly enlarged and the margin of the socket very oblique; 

 the appendage is never more than ^ as long as in the first kind, and is 

 usually ^ or J as long, is more distinctly fringed and terminates abruptly 

 in a rather coarse hook. The entire seta is less than or only equal to 

 the shaft alone of the first kind. 



The short setae occur in both notopodium and neuropodium and in 

 both dorsal and ventral fascicles of the latter. The first parapodium 

 lacks notopodial setae altogether and only 1 to 3 of this kind are found 

 in the neuropodium. In the notopodium of the fifth 5 or 6 occur, and 

 in the neuropodium there are 3 or 4 in the dorsal part of each fascicle. 

 Toward the middle of the body the number increases, the twentieth 

 parapodium supporting about 30 in a spreading fan-shaped notopodial 

 bundle and 6 to 8 in the dorsal part of each neuropodial fascicle. 

 The thirtieth foot shows a slightly increased number, which by the 

 fortieth has fallen to about 8 in each ramus. The second form of seta 

 is restricted to the neuropodium, the dorsal bundle of which contains 

 from 3 to 5 and the ventral bundle from 12 to 20 in the first thirty 

 parapodia, while the single bundle of the fortieth contains but 3 

 altogether. 



There is nothing characteristic about the jaws, which have the usual 

 bro\vn color and curved form with a broad base, acute terminal fang 

 and 6 or 7 smaller teeth. The paragnatha (figs. 5 and 6) are very char- 

 acteristic. All of the areas of the basal ring have united into a con- 

 tinuous zone somewhat narrower on the dorsum, covered thickly and 

 imiformly with small, grainlike, bluntly conical, horny papillae (fig. 9), 

 measuring from .03 mm. to .04 mm. in height and the same in diameter. 

 On the maxillary ring the usual six areas are distinctly differentiated. 

 The paragnatha of the 3 dorsal areas especially are distinctly coarser 

 and more elevated (fig. 10), those of the most anterior rows being largest 

 and strongly hooked. The median dorsal area has the form of an 

 ellipse, about twice as wide as long and formed of about six transverse 

 rows of about six each, except at the ends. The dorso-lateral areas 

 are narrowly crescentic, composed of few paragnaths, but the anterior 

 ones the largest and most strongly hooked of all. The median ventral 

 is nearly circular, composed of numerous small paragnaths similar to 

 those of the basal row and arranged in curved transverse rows. Finally 

 the ventro-lateral areas are drop-shaped with the base toward the 

 jaws and a slender pointed tail. None of the specimens had the pro- 

 boscis protruded and the arrangement of the paragnatha had to be 

 determined by dissection. Some allowance must therefore be made 

 for distortion of the form of the areas on the folded surface. 



