n8 



EISEX 





pouch. These are about one-half as long as the pouch and slightly 

 wider than the duct. Nephridia oblong with a very long and broad 

 anteseptal, almost equal in size to the postseptal less the duct. The 



duct leaves the 

 nephridium at 

 the center. Color 

 white, very trans- 

 parent. Integu- 

 ment thin. 



Locality. Po- 

 pof Island, Shu- 

 magin group, Al- 

 aska, Prof. Tre- 

 vor Kincaid. A 

 single specimen. 

 Several of the 

 posterior somites 

 missing. No at- 



FIG. 79. FHdericia popofiana. ^empt at section- 



ing was made. 



Characteristics. The spermathecae are the most characteristic 

 parts and must suffice to distinguish the species until more material 

 will allow of sectioning and show the nature of the chylus cells, now 

 unknown. 



FRIDERICIA MACGREGORI sp. nov. 



pi. xvii, figs. 4, 5 ; text-fig. So. 



Definition. Length about 8 mm., width .5 mm. Somites about 

 45. Setae in fascicles: laterals, 4, 4, 5, 5, o, 6, 7, 6, 5, 4; ventrals, 

 5, 6, 7, 7, o, 7, 8, 7, 6, 5, 5, 4. The largest setae in each bundle are 

 found bordering the dorsal and ventral intervals. Head-pore between 

 prostomium and somite I. Prostomium slightly pointed. Clitellum 

 not prominent. Sexual papillae small. Septal glands large, in IV, 

 V, and VI. Peptonephridia with six or seven simple branches pro- 

 jecting from a common base. Brain anteriorly much convex, pos- 

 teriorly slightly so. Dorsal vessel rises in XV. Intestine with large 

 chloragogen cells ; in XIV to XVI furnished with numerous long and 

 narrow chylus cells. Spermathecae with a long tapering muscular 

 duct, and a globular ampulla furnished with about eight diverticles, two 

 of the latter being larger than the others ; opens into the intestine. 

 Sperm-ducts narrow, closely wound and confined to the clitellum. 



