SCALIBREGMIDAE. 389 



Locality. Off Peru : 1 1 1 miles N. W. of Aguja Point. Sta. 4651 (lat. 5° 42' 

 S., long. 83° W.). Depth 2,222 fms. 11 November, 1904. One specimen. 



Travisia olens Ehlers, occurring in the Strait of Magellan, is a larger, more 

 evenly fusiform species having thirty-one setigerous somites instead of only 

 twenty-sLx in the present species. It has branchiae over practically the entire 

 length, whereas in profundi these do not occm' caudad of the fom'teenth somite. 

 Similarly T. pupa Moore, which is close to olens, is a much larger species, con- 

 sisting of thirty-one or thirty-two somites, in which the branchiae likewise occur 

 on all somites from the thii'd to near the caudal end of the body. The annula- 

 tion of the somites in this form is conspicuously different. 



SCALIBREGMIDAE . 



In this family the body is comparatively short, sometimes enlarged anteriorly, 

 maggot-like in form, or fusiform. A very thin cuticle invests the thick granular 

 hypoderm in such a way that the skin appears roughened or tesselated, especially 

 anteriorly, in a characteristic manner. The color is often dull brick-red. 



The prostomium is small, either with or without anterolateral, tentacle-like, 

 prolongations; when the tentacles are absent the prostomium simply divided 

 by a fuiTow into two rounded lobes. Eyes none, or so-called ocular bands 

 present (Sclerocheilus) . On each side a groove thi'ough ^^hich the nuchal organ 

 may be everted. 



The somites are distinctly annulated. In most species between the rami 

 of each parapodium there is a small sense-organ which is retractile. 



The parapodia are biramous, with notopodia and neuropodia equally 

 developed, in some with protruding setigerous papillae not evident, the setiger- 

 ous fasciae sessile, in others with the processes prominent. 



The setae in general of two types, simple capillary setae and fm'cate setae 

 with somewhat unequal, commonly barbed, branches. In addition, there may 

 be present in the most anterior one to three setigerous somites setae of a much 

 stouter, acicular type. 



Branchiae either present or absent, when present confined to the fu'st five 

 or six somites and commonly beginning on the second. 



Anal cirri either present or absent. 



A pair of nephridia in each of the somites excepting a few of the most ante- 

 rior. Each is a narrow ciliated tubule with internal funnel small and open. 



Dioecious, with the gonads inicroscopic in size. 



Pharynx eversible and whoUy smooth. 



