554 PROCEEDINGS OF THE ACADEMY OF [Julj, 



Fig. 25.— Outline of a cirriferous parapodium from an anterior somite with- 

 out seta:> and as seen from behind. X 8. 

 Fig. 26.— End of a middle subacicular neuropodial seta from A.V\ . X oo. 

 Fig. 27. — Tip of the same. X 250. r i +„ f^r.,^^ 



Fil. 28.— End of a moderately slender supraacicular neuropodial seta fiom 



Fig. 29'— An average notopodial seta from the dorsal part of the bundle. 



Fig. Soi^Mandible of Ninoe simpla with the stem broken and ridges shown 



on the left side only. X 56. ,^ , . , ,., ,• „ w oa 



Fig. 31 .—Gill (dorsal organ) from somite VII of .4 phrodita neghgens. X ^i. 



Plate XXXVI. Lepidonoius rohustus. . ,• • j- + +i.„ 



Fig 32 -An elytron from the middle region. The stipphng mdicates the 

 distribution of bro^soi pigment; the white circles are the raised un- 

 coiored areas Math a central yellow excretophore(?). X 5. 



Fie: 33.— End of a middle neuropodial seta. X 98. 



Fi£ 34 — 4n average notopodial seta. X 98 ; a, a portion of the same X iW. 



Fi|. S'.-Outline oi anterior aspect of parapodium X; the notopodial setae 

 only are represented. X 9. 



^'Sf 36 -An dvtron from the middle region of a medium-sized specimen. 



Only a portion of the sculpturing on each region is shown. X J. 



a one of the larger papilla^ of the middle region; 6 two ot the lateral 



Marginal papilhe; and c, three small rough papillae trom near the 



antexior end of the fringe. All X 56 

 YW 37 —End of an average dorsal notopodial seta from Al. X Js. 

 Y\s 38— A corresponding seta from somite XI of a specimen ot L. squamatus 



from Wood's Hole, Mass. X 98. 



Ninoe f^^P^l^^^^^.^^^ ^f parapodium XXV, showing the acicula and the position 

 of the dorsalmost and ventralmost neuropodial seta?. X 8^. 

 Fig. 40.— Outline of parapodium L, showng crochets in sifu. X 8-. 

 Fig. 41. — An aciculum. X 250. 

 Fiff 42. — A margined seta. X 250. 



Fil 43 —End of a hooded crochet from a posterior parapodium. X 250 

 Fil' 44— The laws represented in their natural relations except that the 

 halves of the basal plate are separated. From a dissection. X 56. 



"""^irtlinov view of a parapodium (XV) of the anterior region. X 32. 

 Fig 46'.- Similar view of one (C) of the posterior region. X 32. 

 Fis 47 —One of the large (a) and an accessory (b) jaws. X 5b. 

 Fig! 48'.- A small and a large papilla from the proboscis, and a, one ot the 

 latter shown in optical section. X 250. 



