1910.] NATURAL SCIENCES OP PHILADELPHIA. 341 



following two names form a puzzling group the status of which was 

 decided upon only after much hesitation. This arose chiefly from the 

 imperfect preservation of the specimens and the absence of attached 

 elytra, but also because of the similarity and variability of the species. 

 All three species have the caudal end of the body slender and tapered 

 and prolonged considerably beyond the last elytra. 



The cephalic peaks vary greatly, being sometimes much more 

 prominent and acute than is usual in the genus, sometimes short and 

 round, but it is probable that these variations arose as the result of 

 conditions of preservation. No attached elytra were found but two 

 or three loose ones differ from those typical of this species in no way 

 except in the slight development of soft papillae. A bottle from 

 station 4,405 containing some examples of this and the next species 

 yielded three kinds of loose elytra: those typical of the two species 

 and another form lacking large soft papillae and covered thickly with 

 long slender acute spines, resembling very closely, therefore, the 

 elytra of Lagisca crosetensis Mcintosh. A study of all the material 

 at my disposal brings to light an unbroken series between this form 

 and those with large soft papillae and small spines. The setae figured 

 by Mcintosh differ considerably from those of L. multisetosa which 

 have the pectinated plates of the neuropodials continued almost to 

 the tip. It seems not improbable, however, that a fuller knowledge 

 of the LagisccB of the Pacific will demonstrate a multiplicity of variable 

 and intergrading forms. 



Stations 4,405, off San Clemente Island, 654-704 fathoms, green 

 mud; 4,427, off Santa Cruz Island, 447-510 fathoms, black mud and 

 rocks; 4,453, Monterey Bay, off Point Pinos Light, 49-51 fathoms, 

 green mud; 4,517, same, 750-766 fathoms, green mud and sand; 4,574, 

 off Cape Colnett, Lower California, 1,400 fathoms. 



Harmothoe (Lagisca) lamellifera v. Marenzeller. 



Polynoe (LceniUa) lamellifera v. ; Marenzeller, Denkschr. konigl. Akad 

 Wiss. Wien, XLI, Math.-Nat. 01., 2d. Abth. (1879), pp. 115-117, Taf. I. 

 fig. 5. 



Lagisca multisetosa papillata Moore, Proc. Acad. Nat. Sci. Phila., 1908 

 p. 335. 



Most of the specimens here referred to this species agree closely 

 with v. Marenzeller's description and figures but others have setae and 

 elytra that vary somewhat in the direction of both the preceding and 

 following species, from typical examples of both of which these are 

 distinguished by the much reduced cephalic peaks, the sparseness of 

 the marginal fringe of cilia on the elytra, the very short blunt tips of 

 the notopodial setae and the very slender and elongated neuropodial 



