Polychacta. 265 



(a) H. spinosa, var. fullo} 



(PL XLIIT., figB. 1 and 4, and 6-7.) 



Elytra parce vcl liaud fimbriata, spinulis conicis, intcrdum propc marginom 

 posticum verrucis crassioribus circa III mimita. 



The iiiiuiite conical acuminate spines may be localised in definite 

 patches either in the outer portion or on the anterior portion of the 

 elytra. Tlie most anterior spinules may be quite low and blunt, and 

 sometimes all of them have this character (PI. XLIII., fig. 7). One 

 specimen which I refer to this variety after attentive consideration 

 deserves special mention. For a long time I thought it was a new 

 species of Lagisca, but now regard it as a sub-variety of the form 

 under consideration, and shall refer to it simply as v. lagiscoidcs? 

 The elytra of this specimen are destitute of marginal fimbriae and 

 sub-marginal verrucae,^ but possess extra-marginal spinules like those 

 of Lagisca magellanica, Mclnt. (fig. 6). There are forty segments, of 

 which the last six project behind the elytra ; the lagiscoid appearance 

 of free segments behind the elytra will obviously vary according to 

 the condition of regeneration of the posterior end, and also according 

 to the state of general protraction of the body. This specimen 

 measures 49 mm. in length and 15 mm. over the setae ; it was taken 

 outside Cape Adare, 13th November, 1899, in 8^ fathoms. 



{j3) H. sijinosa, var. typica. 

 (PL XLL, figs. 1-3, and PL XLIII., fig. 2.) 



Elytra projie margiuem posticum vel ubique verrucis obtusis muuita, margiue 

 externo fimbriate. 



A comparison of the figures on PL XLL with Kinberg's type- 

 figures,* will convince as to the specific identity of the specimens 

 depicted.^ Tlie elytra are marked by the presence of sub-marginal 

 pustules {^x^inulae eonicac of Kinberg) along the hinder border and 



^ Polynoe fullu, Grube, 1877, Monatsher. Ah. Berlin, p. 515 ; Lagisca 

 jnageUanica, Mcintosh, 1885, ' Challenger ' Eep., XIL, p. 82. Both of these are 

 included by Ehlers (1897) in the synonymy of II. spinosa. 



^ The full designation would be ff. spinosa, \ar. fullo, sub-var. lagisccides, but 

 it is not yet known whether the establishment of sub-varieties is capable of being 

 carried on with profit in Polychaete taxonomy. 



^ These are small wart-like vesicles sometimes present in this variety, but 

 umch more abundant in the typical variety. 



* 'Eugen. Eesa.,' Taf. VI., fig. 31. 



° Except that Kinberg found "appendices omnes lobi cephalici laeves" — 

 " vielleicht aber nur in Folge des schlechten Erhaltungszustandes " (Ehlers, 1897, 

 Hamburg, p. 11). 



