CHINESE EARTHWORMS GATES 



483 



' Indicates that there are gaps in the setal row where setae have probably fallen out. 



On the Hamburg worms: viii/27-30, xviii/10-18. 



The first dorsal pore (Szechwan specimens) is on 11/12 (1 speci- 

 men), on 12/13 (3 specimens). On the Hamburg specimens the first 

 dorsal pore is either on 11/12 or 12/13. 



The clitellum is annuhir, extending from 13/14 to 16/17; dorsal 

 pores and intersegmental furrows lacking ; setae present ventrally on 

 xiv and xvi, possibly also on xv on some specimens. 



The spermathecal apertures are minute, widely separated, on tiny 

 transversely oval tubercles; two pairs, on 7/8-8/9. The spermathe- 

 cal pore tubercles may be slightly protuberant or slightly depressed, 

 in the latter case the appearance is superficially that of a transversely 

 slitlike aperture to a spermathecal chamber. 



The apertures of the copulatory chambers are round or transversely 

 slitlike, the margins finely wrinkled. Each minute male pore is 

 located on a small, smooth-surfaced, ovoidal to conical tubercle, which 

 projects into the copulatory chamber lumen from the center of the 

 dorsal wall. 



Internal anatomy. — Septum 7/8 is thickly muscular or at least 

 thicker than 5/6-6/7; 8/9-9/10 lacking. 



The intestine begins in xv (8 specimens). The intestinal caeca are 

 compound, glove-shaped, the dorsalmost secondary caecum the long- 

 est. The secondary caeca (4-9) are elongate, fingerlike, anteriorly 

 directed, the length decreasing passing ventrally. On the esophagus 

 just behind the gizzard is a low glandular collar. 



Hearts of segment x were not found in any of the specimens. The 

 single heart of ix is on the right side (4 specimens) or on the left 

 side (4 specimens). The last pair of hearts is in xiii (8 specimens). 

 All hearts of ix, xi-xiii pass into the ventral vessel. 



The testis sacs of x and xi are unpaired and ventral. The seminal 

 vesicles of xi and xii are fairly large, filling their segments and reach- 

 ing into contact transversely over the dorsal blood vessels. Each 

 vesicle is provided with a fairly large, more or less conical primary 

 ampulla, the base of which is deeply constricted off from but sunk 

 into the dorsal margin of the ventral lamina. The prostates extend 

 through xvii-xx or xxi. The prostatic duct is 21/2^1/2 mm long. The 

 entalmost portion of the duct, about 1 mm in length, is very slender. 



