ENCHYTR^EID^E III 



upper course near the mouth. The immediate vicinity of the membrane 

 is crowded with granules which stain deeply with eosin, the deeper the 

 nearer the membrane. The lower part of the canal is bent at a right 

 angle to the upper part, and the spur thus formed is in all the cells 

 invariably pointing toward the head of the worm. 



Penial bulb. This organ contains only one kind of cell, though 

 some cells open in the extension of the sperm-duct and others along 

 the free surface of the bulb. The duct enters the bulb near the base, 

 pi. xx, fig. 4, represents the bulb as seen in a section transverse to the 

 body. In a longitudinal section it would probably appear just as in 

 pi. xv, fig. 8, representing the bulb of F. calif ornica. 



Nephridia. The anteseptal is probably the largest of any observed 



sfc far. In some nephridia this part was fully as large as the post- 



septal lobe. The ciliated part of the nephrostome is quite small. A 



tortuous, uneven duct runs down from this ciliated chamber to the 



^postseptal. 



FRIDERICIA JOHNSONI sp. nov. 



pi. xvi, fig. 6; text-fig. 72. 



Definition. Length 8 mm., width .5 mm. Somites 45 to 48. 

 Prostomium blunt. Dorsal pores begin in VII. Seta of unequal 

 length, the inner ones much shorter ; five and four setae in the anterior 

 and central fascicles. Head-pore between prostomium and somite I. 

 Clitellum not prominent in XII and XIII. Sexual papillae small. 

 Anterior septa slightly thicker than those posterior to clitellum. Septal 

 glands in IV, V and VI. Supra-pharyngeal glands small. Peptone- 

 phridia thick and compact, with the free end frayed. Brain longer 

 than wide, with the posterior margin slightly concave. The anterior 

 retractor muscles of the brain are situated far forward. Dorsal vessel 

 rises in XIII. Intestine narrow, widening in XIII. Intestine com- 

 mencing with XIII is covered with a thick layer of very tall chlo- 

 ragogen cells. In the anterior somites these cells are very low and 

 few. Chylus cells in X, XI and XII, none posterior to clitellum. 

 Spermathecse with a club-shaped apical ampulla connecting with the 

 intestine; no diverticles. Penial bulb with two kinds of glandular 

 cells; those opening at the base of the sperm-duct are the largest. 

 Nephridia with large non-glandular anteseptal in which the duct is 

 spirally wound. The large lymphocytes are disc-like and almost 

 circular. Color white. 



Locality. Garden of Ell wood Cooper, at Ell wood, near Santa 

 Barbara, California, May, 1898. Named for Prof. Herbert P. John- 



