452 THE ANNELIDA POLYCHAETA. 



and above this a very elongate, proboscis-like one, which in the type is cren- 

 ulate along its lateral edges. 



No paleae are present. 



Two stout spines, but little exposed, caudad of the branchiae on each side. 



Four pairs of proximally stout and somewhat flattened, distally pointed 

 branchiae, with the four of each group arising close together. 



Notopodia distinct. No distinct cirri. Thoracic uncinigerous tori imme- 

 diately beneath the notopodia and forming distinct 'though not elongate lobes 

 on all but the first few setigerous somites. The abdominal tori small. 



Notopodial setae simple, bilimbate. Uncini in a single series on each 

 torus. Uncini not prolonged, pectinate along the free margin as in related 

 genera. 



Genotype. — Moyanus explorans, sp. nov. 



No nuchal hooks are present, such as are prominent in Isolda and most 

 species of Melinna. Such hooks are absent from some species of Melinna, 

 however, e.g., M. monoceros Augener and M. pacifica Mcintosh. A nuchal 

 fold, such as is prominent commonly in these two genera along the anterior edge 

 of the fourth somite, is present, but without teeth and in a weakly developed 

 condition. From Isolda and Melinna, which are otherwise, in general, similar 

 in habitus, large number of somites and general structure, Moyanus is readily 

 separated, particularly by the presence of the conspicuous prolongation of the 

 prostomium above the tentaculiferous lobe. Isolda stands apart in the branched 

 character of part of its branchiae. 



Moyanus explorans, sp. nov.^ 

 Plate 77, fig. 11, 12. 



The integument of the anterior half of the body is thin and transparent, 

 or nearly so, and almost colorless, the dark contents of the alimentary canal 

 showing plainly. The posterior region of the body is distinctly pigmented, 

 brown. 



Of the specimens studied only the type is complete. It is 114 mm. long 

 and consists of sixty-five somites, or about that number, caudad of the setigerous 

 region, the fraying of the body in two places preventing a wholly accurate count. 

 The total number of somites is thus near eighty-one. The length from the ex- 



' exploraro, to explore. 



f 



