CHINESE EARTHWORMS GATES 479 



margins incised in such a way as to mark off several rounded and 

 stumpy or short, fingerlike lobes. Rarely there are also a few inci- 

 sions of the dorsal margin. The typhlosole, a bladelike ridge, begins 

 in the caecal segment. 



There is a pair of hearts belonging to ix in 4 specimens; a single 

 heart on the right side in 8 specimens, on the left side in 10 speci- 

 mens. The last pair of hearts is in xiii (26 specimens). All hearts 

 of ix-xiii pass into the ventral blood vessel. The hearts of x may 

 be bound to the anterior face of 10/11 by connective tissue so that 

 they are not readily recognizable. 



The testis sacs of x and xi are unpaired and ventral (7 specimens), 

 probably paired and ventral — no transverse connections between tes- 

 ticular masses of a segment recognizable (3 specimens, including one 

 of the E specimens). The seminal vesicles may be small or medium- 

 sized and vertical bodies, or large and in contact dorsally above the 

 dorsal blood vessel, filling their segments. Primary ampullae may or 

 may not be recognizable and when present may be more or less coni- 

 cal, protuberant, or sunk in a deep cleft in the dorsal margin of the 

 ventral lamina, or merely demarcated from the ventral lamina by a 

 circumferential constriction. 



The spermathecal duct is stoutish, slightly bulbous toward the 

 parietes. shorter than the ampulla, an ental portion usually invagi- 

 nated into the ampulla. The diverticulum may be longer or shorter 

 than the combined lengths of duct and ampidla. The diverticular 

 stalk, which passes into the duct close to the parietes, is slender and 

 glistening, nearly straight or bent entally into one to tliree tiny loops, 

 the latter open or with the limbs in contact. The thicker but thin- 

 walled seminal chamber, which is usually clearly marked off from the 

 stalk, is elongate-ovoidal to ellipsoidal, approximately spheroidal, 

 or somewhat pear-shaped. In the latter case the seminal chamber is 

 not clearly marked off from the stalk. In specimen E the diverticu- 

 lum is nearly three times as long as the combined lengths of duct 

 and ampulla. 



In segment xviii of specimens A-D and F the number of stalked 

 glands is equal to the number of genital markings, including tlie 

 male pore tubercles in the category of genital markings. Anteriorly 

 the number of discrete glands may be less than the number of genital 

 markings. Thus on the right side of segment ix in each of two speci- 

 mens (A and B) two glands are enclosed in a common, connective 

 tissue sheath; the entalmost portions of the stalks of the glands 

 joined ; passing ventrally toward the parietes the two stalks diverge, 

 one passing to the genital marking immediately behind the sperma- 

 thecal-pore tubercle, the other passing to the more median genital 

 marking. (Also in viii and the left side of ix in specimen F.) A 



