1902.] NATURAL SCIEXCES OF PHILADELPHIA, 271 



Harmothoe (Eunoa) nodosa (Sars) Malmg. 



Two examples approach nearer to Eunoa cerstedi in many 

 respects. The distinctness of these two species has been already- 

 called in question, but is generally upheld by the highest authori- 

 ties. The scales exhibit the dense external ciliation of E. nodosa, 

 but are rougher even than cerstedi. The large pavillse are spinous 

 at the apex, and many even of the smaller ones, especially toward 

 the outer margin, bear a number of conical or bifid divergent 

 spines. Around the posterior margin, and more or less elsewhere, 

 many of the papillae become low, rounded and mound-shaped, and 

 bear numerous small spines in clusters. Anteriorly the roughness 

 of (he scales increases and a detached scale, which, being circular, 

 is regarded as the first, bears around its entire margin a narrow 

 band of large, irregularly globoid bosses, produced into numerous 

 processes, each of which bears a tuft of spines at its summit. A 

 smaller group occurs at the middle of the scale and papillae of 

 smaller size are scattered between. All of these papillie are hard 

 and horny and supported on horny basal plates of various and 

 irregular shapes. 



The ventral setse have the form figured by Mcintosh, and the 

 dorsal also resemble his figure of E. nodosa, except that the short 

 tips are sculptured in much the fashion of the smaller notopodial 

 setse of Harmothoe tnmcata. They resemble the apex of the green 

 fruit of Lireodendron or a winter leaf-bud, but are less regular 

 and the smaller ventral ones especially have fewer scales or ridges. 

 The ventral setse of II resemble Mcintosh's figures of a'rstedi 

 rather than nodosa. 



Several discrepancies appear in the published accounts of the 

 species of Eunoa. Malmgren figures the smooth tips of the noto- 

 podial setse of nodosa as the longer of the two species; Mcintosh 

 both describes and figures the reverse, but neither indicates the 

 sculpturing. Mcintosh in one place^ (p. 292) describes segmental 

 papillse in Eunoa, in two other jDlaces (pp. 291 and 293) he states 

 that they are absent. In these specimens they are nearly as well 

 developed as in Harmothoe Imbrlcata, for example. 



The head and its appendages conform almost exactly to Mc- 

 intosh's figure. The anterior eyes arc (j[uite dorsal in position, situ- 



' Monograph of British Annelida, Part II. 



