CHINESE EARTHWORMS GATES 457 



The first dorsal pore is on 11/12 or 12/13. 



Two specimens have no clitellar glandularity at all; three speci- 

 mens have slight traces of clitellar glandularity on xiv-xvi. 



The secondary spermathecal apertures are two pairs on 7/8-8/9; 

 the apertures wide slits that open into deep depressions. If the mar- 

 gins of a depression are separated, the minute primary spermathecal 

 pore may be seen, with favorable illumination, at the center of a 

 smooth, flat, circular to oval area on the roof of the depression. 



On xviii on each side, on the least mature specimen, there is a 

 rather deeply bowed, crescentic slit, with its concave margin directed 

 midventrally. The slit opens into a parietal invagination, which is 

 deepest laterally and rather shallow toward the median ends of the 

 crescent. The lateral wall of the invagination is thin and lacks 

 setae. On the median wall of the invagination is a ridge of tiny 

 lobes or roughened projections, continuous with the circumferential 

 ridge on which the setae are located, but no setae were found in or 

 between the lobes. Median to the slit but between the anterior horn 

 and the setae is a transversely oval, flat-surfaced, slightly protub- 

 erant tubercle. On another specimen the lateral portion of this pi'e- 

 set-al tubercle is within the parietal invagination (here deeper) ; be- 

 fore the whole of the tubercle can be seen the lateral lip must be 

 cut or drawn aside. On the maturest specimen the presetal tubercle 

 is entirely within the invagination (in reality in this worm a copu- 

 latory chamber) and not visible until the chamber is cut open. The 

 aperture on this specimen is larger and nearly circular. 



There may be a second tubercle on xviii, postsetal in position and 

 in line with the presetal tubercle and of about the same size and 

 appearance. On the dorsal roof of the invagination are 2 or 3 addi- 

 tional tubercles of varying shape and size, on one of which the 

 minute male pore is located. 



The preclitellar genital markings are syimnetrically paired on vii 

 and viii, on the posteriormost margins of the segment, almost on 

 the intersegmental furrows, each marking 1-3 intersetal intervals 

 median to the spermathecal pore. On the most nearly mature speci- 

 men these markings are slightly protuberant and may be called tuber- 

 cles. On the other specimens the markings are scarcely visible, the 

 boundary of each marking represented by a very slight furrow. Cu- 

 riously, a porelike depression at the center of these markings is much 

 more readily visible, as a rule, when the markings are only slightly 

 developed. 



Internal anatomy. — Septa 5/6-7/8 are slightly thickened ; 8/9-9/10 

 lacking; 10/11-12/13 muscular. 



The intestine begins in xv. The intestinal caeca are compound, 

 with 3-11 anteriorly directed, secondary caeca, the dorsalmost the 



