274 PROCEEDINGS OF THE ACADEMY OF [April, 



tentacles situated slightly dorsal to margin, immediately behind and 

 almost in contact with frontal tentacles, reaching to VII or VIII; 

 the ceratophores slightly longer than frontal tentacles, divided to the 

 end into eight or ten annuli; the styles smooth and slender. Posterior 

 paired tentacles on dorsum well back from margin and immediately 

 above and behind anterior paired, reaching to XV or XVI; cerato- 

 phores shorter and stouter than anterior paired, nine- to eleven-annu- 

 late. Median tentacle posterior to middle of prostomium, reaching 

 XIV, with a shorter ceratophore having nine annuli. Apparently all of 

 the tentacles have lost a short portion of the tip and each one is marked 

 by a more or less distinct broad purple zone. Palps prominent, 

 divergent and directed ventrad, bilobed by a shallow transverse 

 furrow. No eyes detected and pigmented eyes certainly absent. 



Peristomium nearly as long as prostomium, its anterior end scarcely 

 wider, little concave and its sides continuous with prostomium, its 

 dorsum strongly convex. Nuchal cirri on anterior margin of peristo- 

 mium, slightly longer than piostomium and reaching two-thirds or 

 three- fourths to base of opposite cirrus, regularly tapered from base 

 to tip, often with a purple spot. Ventrally the peristomium forms a 

 pair of thick folds behind the palps and a bilobed hinder lip. The 

 next two segments, each about as long as peristomium, slightly carried 

 forward at sides to bear parapodia and embrace the preceding segment, 

 but not conspicuously enlarged. Succeeding segments become 

 slightly wider to about XV, after which they remain practically un- 

 changed. Those of middle region about four times as wide as long, 

 smooth, simple, rather strongly depressed. Pygidium unknown. 



Parapodia of the prebranchial region (Pi. XVIII, fig. 77) large and 

 prominent, the undivided body alone of the first three exceeding 

 one-half the width of their segments, projecting somewhat forward 

 from the anterior ventro-lateral region of their segments. They have 

 stout, slightly compressed, subtruncate, cross- furrowed, chiefly neuro- 

 podial bodies and the usual notocirrus, neurocirrus and postsetal lobe 

 or middle cirrus, all of which are rather stout and subcorneal, the 

 postsetal lobe being somewhat flattened and the notocirrus about one 

 and one-half times as long as the others, with a basal constriction. 

 The fourth foot (on somite V) is similar to the three preceding ones, 

 but decidedly smaller. With the fifth a considerable reduction in 

 size takes place and the parapodia have approached the dorsum, at 

 which level all succeeding ones remain, the body becoming at the same 

 time much reduced, short, truncate, subcorneal and directed somewhat 

 dorsad. At the fifth parapodium the neurocirrus becomes much 



