360 PROCEEDINGS OF THE ACADEMY OF [April. 



sloping face of the parapodia, convex dorsally, its ventral border- 

 prolonged into a slender, tapered, acicular process from the extreme 

 end of which the tip of the single stout aciculum projects. Neuropodia 

 very large, sloping from both dorsal and ventral borders to a blunt 

 tip from which projects a blunt, stout acicular process bearing a 

 finger-like terminal cirrus beneath which the tip of the aciculum 

 appears. 



Notocirrophores arise immediately above and behind notopodia; 

 they are unusually long and slender and nearly equal the length of 

 the notopodium with its acicular process (fig. 35); styles also long 

 and slender, reaching beyond mid-dorsal line and fully one-third of 

 their length beyond tips of longest neuropodial setse, regularly tapered 

 to slender tips without subterminal enlargements and bearing a few 

 very short clavate sensory papillae. Neurocirri very small, arising 

 near middle of ventral face of parapodium and scarcely reaching to 

 ventralmost row of neuropodial setae, slender, tapered, subulate and 

 quite smooth. On somite II the rami are nearly equal and the neiu'o- 

 cirrus reaches nearly to the setae tips. 



Elytrophores low and inconspicuous, borne on somites II, IV, V, 

 VII and alternate segments to XXIII, XXVI, XXIX = 14, a fifteenth 

 on XXXII being probably normal. Dorsal tubercles, which alternate 

 with elytrophores, small but rising prominently above the level of the 

 dorsum, especially on anterior segments. Elytra very readily detached,., 

 large and completely covering dorsum, except the first, which is cir- 

 cular with central attachment, the others broadly ovate-reniform Avith 

 oval scar antero-mediad of center (PI. XXX, fig. 36). Texture soft 

 and membranous; to the naked eye surface appears smooth and 

 lacking cilia; under the microscope they exhibit an area of minute 

 tubercles between the scar and the anterior border, a slightly granular 

 surface elsewhere and a few minute cilia along the margin. The 

 nerves, branching and radiating from the scar, are conspicuous through 

 the translucent tissues. Many of the elytra are covered with a greenish- 

 yellow incrustation with oblique parallel streaking. 



Acicula single, deep yellow, of the usual stout, tapered form with 

 simple tips. Setae all pale straw-colored, long, forming prominent 

 tufts. Notopodials much stouter than neuropodials, the fascicles 

 forming whorled tufts directed more laterad than dorsad; the setae 

 (PI. XXX, figs. 39, 40) very slightly curved, tapered to blunt-pointed, 

 smooth tips below which are very numerous close rows of teeth so 

 fine that they can be differentiated only under high magnification. 

 Somite I (peri.-ftomium) ]30ssesses two short setae of this type pro- 



