CALIFORNIA ACADEMY OF SCIENCES. 
[o,0) 
Prats II. 
Fig. 8. Ventral nerve trunk and cephalic ganglion. 
Kig. 9. Seminal receptacles and albuminous gland. 
re. sem.: seminal receptacles. 
gl. alb.: albuminous gland. 
Fig. 10. Interior extremity of one of the receptacles, showing the sperma- 
tozoa accumulated in the same. 
Fig. 11. One of the oviducts, with eggs in the act of descending. 
Fig. 12. The interior extremity of one of the segmental organs. 
Fig. 13. One pair of spines. 
Fig. 14. Interior view of the ventral part of the worm. 
gl. alb.: albuminous gland. 
re. sem.: seminal receptacles. 
test.: testes. 
OV.: ovaries. 
ovd.: oviduets. 
atr.: atrium. 
eff. d.: efferent ducts. 
Fig. 15. One of the egg capsules or cocoons. In the interior are seen three 
young worms, magnified about five times. 
The Roman numerals everywhere indicate the segments. In numbering the 
same I have everywhere in this paper referred to the first segment as segment 
I, thus following Vejdovsky and others. In former papers I have always referred 
to the first setigerous segment as segment 1, and believe yet this way to be the least 
confusing. But as uniformity in numerating the segments is highly desirable, 
and as every investigator seems to have his pet way, leading to endless misunder- 
standing, I shall for the future accept the system used in this paper, hoping all 
other investigators will do the same. 
