CHINESE EARTHWORMS — GATES 419 



The clitellum is annular, extending from 13/14 to 16/17, interseg- 

 mental furrows and dorsal pores lacking on eight specimens, func- 

 tional dorsal pores present on one specimen. 



The spermathecal pores are minute, widely separated, one pair, 

 on 8/9. 



In the setal circle of xviii on each side is a short transverse ridge, 

 toward the lateral margin of which the minute male pore is located. 

 Rarely the portion containing the male pore is definitely separated 

 from the rest of the ridge as a distinct tubercle. On one specimen 

 the ridge is represented only by a lateral male pore tubercle and a 

 transversely oval tubercle at the approximate site of the median end 

 of the ridge. 



Each worm is characterized by the presence of a median, presetal 

 genital marking at the midventral line on segments iii, iv, and v. 

 The markings are circular, the diameter about equal to interval aa; 

 the grayish, translucent, central area within the narrow, opaque, 

 whitish rim is flat, convex, or concave. 



Internal anatomy. — Septa 5/6-7/8 are thickly muscular; 8/9-9/10 

 lacking; 10/11-13/14 strengthened, 10/11-12/13 more than 13/14 but 

 none of these so thick as the pregizzard septa. 



The intestine begins in xv. The intestinal caeca are simple; the 

 ventral margin is incised, the depths of the incisions decreasing an- 

 teriorly ; the secondary lobes, short and rounded or longer and rather 

 finger-shaped, are always directed ventrally. The dorsal margin 

 may be slightly incised. 



The single heart of ix may be on either the right or the left side. 

 The hearts of x were not found in some specimens but were located 

 in one worm on the anterior face of 10/11, where they were covered 

 by connective tissue. The last pair of hearts is in xiii. The hearts 

 of ix-xiii all pass into the ventral trunk. 



There is a single ventral testis sac with a bilobed anterior margin 

 projecting conspicuously from the anterior face of 10/11. There is 

 also a single ventral testis sac in xi, but the anterior margin is so 

 deeply indented that there appear to be two separate conical sacs 

 with the bases of the cones on the anterior face of 11/12 while the 

 pointed anterior ends are directed toward 10/11. The anterior points 

 of the testis sac do not reach 10/11, but a tiny thread passes from the 

 apex to 10/11. The buttonlike testes are in the apices of the sacs 

 and not on the posterior face of 10/11. The seminal vesicles of xi 

 and xii are in contact transversely over the dorsal blood vessel. Each 

 vesicle may have a primary ampulla, definitely characterized as to 

 color and surface appearance, and may be almost completely con- 

 stricted off from the ventral lamina or deeply sunk into the dorsal 



