288 PROCEEDINGS OF THE ACADEMY OF [April, 



much in the form of the postsetal lip of the parapodia and of the 

 maxillae. These two species taken in conjunction with such species 

 of Lumbrineris as erecta and tetraura largely break down the distinction 

 based on the presence or absence of branchiae that is usually made 

 between the two genera. On the other hand, their possession of the 

 nuchal papilla segregates them from the majority of species of both 

 genera. 



The species of Lumbrineris and related genera of this region are 

 noteworthy because of their tendency to develop prolonged branchial 

 processes of the parapodia. This tendency seems to be most marked 

 in the fauna of the deeper waters of Monterey Bay and reaches its 

 maximum in L. bifilaris. 



Lumbrineris japonica v. Marenzeller, index subsp. nov. PI. XIX, figs. 119-127. 



Lumbriconereis japonica v. Marenzeller, Denkschr. K. Akad. Wissensch. 

 (1879), XLI, pp. 137, 138, Taf . V, fig. 3. 



This well-marked form presents a superficial resemblance to L. erecta 

 of the littoral zone of the coast of California, but its technical characters 

 so closely ally it with L. japonica that it is regarded as belonging to that 

 species. The chief peculiarity is found in the noteworthy elongation 

 of the postsetal lip of middle and posterior parapodia which is quite 

 as pronounced as in L. erecta. The erectness and rigidity characteristic 

 of these processes in the latter species is here absent; they are evi- 

 dently more flexible and mobile and usually directed laterad in many 

 cases (fig. 120), reminding one of a pointing finger. This feature does 

 not appear on anterior parapodia, on which the postsetal lips are 

 foliaceous, the digitiform or cirriform character usually becoming 

 pronounced by about somite XXXV. 



Articulated crochets occur as far forward as III on the type and 

 persist to XXV; on other specimens they were not detected anterior 

 to III, V or VIII, but continued as far as XXX, after which point 

 simple crochets only occur. Limbate setae may cease at LVI, as on 

 the type, or continue to LXXV. The form of these crochets differs 

 somewhat from those of Japanese examples of the species. (See 

 PI. XIX, figs. 124, 125.) There is a single chitinized area on each side 

 in connection with the maxillae, instead of two as in L. bifilaris. 



The jaws (PI. XIX, figs. 126, 127) agree very closely with v. Maren- 

 zeller's figures. The maxillae are opake and very dark brown or nearly 

 black, the mandibles pale brown marked with darker brown lines 

 and the whitish masticatory plates tipped with a black edging. 



The type (station 4,464) is 109 mm. long with a maximum width 

 at XII of 2.8 mm. and between setae tips of 5.7 mm. Segments 201. 



