126 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



causing it to protrude from a cavity. The apex of the 

 papilla is furnished with a small pit into which open the 

 sperm-ducts and the prostate, immediately adjoining each 

 other. The spermathecal pores and the ovipores appear 

 to be in line with the ventral setae. 



Septal formula: — 



vm, vi/vii, vii/viii, viii/ix, Ix7x, x/xi, xi/xii, 



XII/XIIL 



Septal Glands. — The glands in V are the thickest, the 

 others diminish in thickness posteriorly, so that those in 



VIII are thinnest. The length (in the direction of the short 

 diameter of the body) of the respective sperm-sacs is, 

 however, very nearly the same. 



Intestine. — The tubular intestine is narrow and tubular, 

 its outer walls being parallel where they pass the septa. 

 Between the septa the respective parts of the intestine are 

 greatly bulged out or beaded. The chylus diverticles in 



IX are long and slender; they originate in the posterior 

 part near the posterior septum. Sacculated intestine com- 

 mences in XII. 



Sfermathecce. — The spermathecee are postseptal, opening 

 half-way between the setse and the septum VIII/IX. Their 

 lower or muscular part is cylindrical and very thick, occupy- 

 ing the whole width between the setse and the septum. The 

 length of each is about one-fourth the diameter of the coelom. 

 The upper sac is irregularly globular and hangs down over 

 the posterior side of the muscular part, giving the organ 

 somewhat the shape of a smoking pipe. This greatly inflated 

 sac is as wide as two ordinary somites and reaches to the 

 center of the coelum. The large size of the spermathec^ so 

 increases the size of somite IX that its width is that of two 

 ordinary somites. There is no diverticle. 



S-perm-sacs. — The racemose sperm-sacs in IX and XII 

 are of the regulation type and very large, filling the whole 

 of the somites. They have comparatively few lobes, these 



