444 PROCEEDINGS OF THE ACADEMY OF [June, 



Compound setae occur in all parapodia ; colorless, the stem curved, its 

 end enlarged very gradually to a maximiun of twice the ordinary diam- 

 eter, the thickened part with obliciue axial striations and a finely den- 

 ticulated convex margin; appendix a relatively slender blade, the 

 greatest width H times the diameter of the stem and its length about 

 5^ times the width (middle of 10th parapodium), terminal teeth prom- 

 inent, well separated, moderately hooked, edge of blade finely serrate, 

 guard prolonged beyond body of blade as a sharp spine about 

 equalling in length the width of the blade. 



Capillary setae are also found as a fascicle in the dorso-posterior part 

 of each neuropodium; they project two or three times as far as the 

 compound setae, are colorless, straight or gently curved, the terminal 

 half very finely acuminate and the surface feebly granulate. Paddle- 

 shaped pectinate set re appear to be absent from the first parapodium, 

 but occur on all the others in very limited numljer at the base of the 

 bundle of capillary setae; the end is curved in half-round form, is rela- 

 tively narrow, 3 to 4 times the diameter of the stem, with al)out twelve 

 slender, straight points of even length and one delicate prolonged mar- 

 ginal process. 



Both neuropodial and notopodial acicula are present in all of the 

 parapodia; the latter are always 2 in number, very slentler, tapering 

 and with rather abruptly curved ends which terminate just opposite 

 the apex of the angle Isetween the notopodial cirrus and its Ijranchia. 

 The ordinary neuropodials are also 2 in number and enter the acicular 

 lobe, beyond which their blunt, straight, or (posteriorly) bent ends 

 project, most prominently posteriorly. The /-shaped, hooked acicula 

 are first detected on somite XXI. A single one (rarely 2) passes ob- 

 liquely through each neuropodium, appearing at the ventro-lateral 

 angle. The}' are stout , pale yellow, rather strongly curved and hooked, 

 the principal beak-shaped process looking forward and surmounted by 

 an uneciually bifid accessory process, the smaller division of which is 

 sometimes minute or even absent; guard wide, slightly bilobed and 

 striate. 



The color has been entirely lost except the brown spots at the bases 

 of the notopodial setae. The cuticle is only slightly iridescent, most 

 so on the head. 



Sagami Bay, 3,700, 63 fms., type; Suruga Bay, 3,707, 63-75 fms. 



ONUPHID^. 

 Hyalinoecia tubicola (Miiller) Mgrn. 



What should perhaps be designated as a distinct variety of this spe- 

 cies occurs throughout the entire region of Suruga Bay and Totomi 

 Sea. in from 63 to 167 fathoms. 3,707, 3,715, 3.737, 3,740. 



