528 PROCEEDINGS OF THE ACADEMY OF [July, 



side of the tubercle and spreads ventrally and caudally over and be- 

 tween the neuropodia. The deeper concealed ones are colorless, those 

 on the exposed surface of the tuft iridescent, but they show little bril- 

 liancy, being usually of a pale rose-red with dull green or occasionally 

 bluish reflections. Compared with some species they are coarse and 

 rather short, so that they do not conceal the neuropodial setae. Pos- 

 teriorly they become dull gray. Immediately anterior to the dorsal 

 cirrus is a tuft of about 7 of the large curved setae arranged in a trans- 

 verse row and becoming larger dorsally. A second more median tuft, 

 which springs from a line curving obliquely caudad and mediad, con- 

 sists of 10 or 11, the ventral ones being very small and the dorsal much 

 larger than any in the more lateral tuft, so that they nearly meet those 

 of the opposite side in the median line. These setae are of a peculiar 

 clay brown color, of rather soft though brittle texture, finely striated, 

 strongly curved, very coarse at the base and gradually tapered to near 

 the end, which is abruptly contracted to a hard, strongly hooked, acute 

 tip (fig. 2). The surface is devoid of asperities, perhaps through wear. 

 Between these two tufts and anterior to the more lateral a second tuft 

 of iridescent capillary setae, more slender than those described above, 

 arises and spreads caudally and dorsally of the bases of the large setae. 

 The dorsal felt fibres arise in a compact bundle dorsal to the dorsalmost 

 tuft of large setae. The neuropodial setae are arranged in the customary 

 3 rows, the dorsal usually containing 2 stout, the middle 3 medium and 

 the ventral 5 more slender ones (fig. 1), All are of similar form, slightly 

 curved and somewhat hooked and tapered at the tip. All of these setae 

 are much worn, the points blunt and only slight traces of the hairy 

 sheath remaining. 



On elytra-bearing somites the arrangement is the same, except that 

 the bundle of felt fibres is wanting and the dorsalmost tuft of large 

 setae is inclined more medially so that they penetrate the felt nearer 

 to the middle line than on the cirri-bearing somites, leading to the ap- 

 pearance of three series of large setae, as mentioned above. 



At the ends of the body the parapodia are considerably modified. 

 Posteriorly the notopodium becomes relatively more elevated, the 

 whole parapodium more compressed and turned so that it overlaps its 

 successor behind, the capillary setae tufts more flattened, the neuro- 

 podial setae more slender, the large notopodials more crowded, and the 

 dorsal cirri relatively longer. At the anterior end the first has the 

 us\ial 3 tufts of capillary bristles, and the dorsal barely longer than the 

 ventral cirrus, the excess being due entirely to the length of the basal 

 joint. The second bears 2 dorsal and 2 middle neuropodial setae, and 



