KAINONEREIS ALATA. 199 



and posterior regions the arching is proportionately less strong. The sc^cond 

 somite is two thirds as long as wide, essentially the same proportions Ix-ing 

 maintained also in the next five somites. The seventh s6mite widens from in 

 front to the caudal end. The eighth somite is typically proportionately abruptly 

 shorter, being but one half as long as wide, while the ninth is about two and a 

 half times wider than long. The pygidium is small and bears two anal cirri. 

 Each anal cirrus has a distinct, thicker cirrophore, upon which is borne the style. 

 The style is short, when laid along the body reaching to the fourth somite from 

 the caudal end. It is moderately tapered distad and is constricted at the 

 extreme base. It is strongly annulate like the other cirri. (Plate 28, fig. 7). 



The parapodia are attached laterally near the middle of the height. On 

 the most anterior somites they are attached at the anterior end, but caudad 

 they gradually shift to a middle position. The first eleven pairs of parapodia 

 are contrasted with the others in being shorter and, in preserved specimens, at 

 least, in projecting more directly ectad, the larger posterior ones projecting caudad 

 of ectad, in not bearing foliaceous appendages on the neuropodia, and in 

 their setae. The anterior parapodia differ in length among themselves, becom- 

 ing progressively shorter in proceeding from the thirteenth forward to the 

 first pair. All parapodia are biacicular and biramous, with each branch termi- 

 nating in one or two special finger-like processes, and bear notocirri and neuro- 

 cirri. In the short anterior parapodia the notopodium is a little reduced. Its 

 two distal digitate processes are short and slender. One of these, the more 

 dorsal, is in connection with the aciculum. The setae are few and of a special 

 type. The neuropodium shows two short terminal processes, from one of which 

 the setae arise and into which the aciculum extends without protruding through 

 the surface; the second process is on the ventral side. The neurocirrus is 

 attached on the ventral side at the very base; its cirrophore is thick and short; 

 the style above its constricted base short and narrowly conical and not attain- 

 ing the end of the neuropodium. The notocirrus arises on the dorsal side near 

 the middle of the length from a very low elevation, or cirrophore; its style is 

 narrow at the base, expanding at the middle into a small lamellar structure from 

 one side of which a slender, pointed, finger-Uke process extends. (Plate 29, fig. 4) . 

 The parapodia of the fifth, sixth, and seventh pairs are strikingly differentiated 

 from the others in having the dorsal expansions on the notocirri greatly enlarged 

 to form broad, subcircular elytra, the finger-like process itself being also much 

 thicker than in the notocirri of other parapodia. (Plate 28, fig. 9 ; Plate 29, fig. 2) . 

 In the notopodium several of the special stout setae appear, while the number of 



