CHINESE EAETHWORMS GATES 447 



Material examined. — From the Hamburg Museum: 1 clitellate 

 specimen in good condition labeled "V 9084. Pherethna hongkon- 

 gensis Mich. Cohn. Hongkong." 



Exteiinal characteristics. — The setae are small, closely and reg- 

 ularly spaced ; they begin on ii, on which segment there is a complete 

 circle. Setal formula : vi/21, vii/20, viii/8 + , xvii/17, xviii/7, xix/15, 

 XX/58+ ? (xiv/4, xv/2, xvi/7). The body wall has been ruptured or 

 abraded midventrally at several places, among which is included 

 segment xx. There are gaps ventrally in the setal circle of viii, 

 possibly due to the falling out of setae. 



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

 pores and intersegmental furrows lacking or not clearly indicated; 

 setae present ventrally. The clitellum is dull and roughish, not 

 smooth and glistening, apparently not fully developed. 



The first dorsal pore is on 11/12, 



The spermathecal pores are minute, transverse slits, four pairs, 

 each pore at the center of a very small, smooth, transversely oval 

 area. 



The male pores are minute, each pore a trifle lateral to the center 

 of a male pore marking. The latter is nearly but not quite circular 

 in shape, 11/2-2 intersetal intervals wide transversely, slightly pro- 

 tuberant but with a rather flat surface and surrounded by a slight 

 but definite circumferential furrow. Just median to each male pore 

 marking is a single transversely oval genital marking with a con- 

 spicuously protuberant, whitish rim and a depressed, grayish, cen- 

 tral area; 2-3 intersetal intervals wide transversely. The genital 

 marking is not in actual contact with the male pore area though close 

 to it. 



Internal anatoyny. —^^xyiwrn 8/9 is present at least as a ventral 

 rudiment. 



The intestinal caeca are simple, without marginal incisions or 

 septal constrictions. The typhlosole projects conspicuously into 

 the gut lumen as a bladelike ridge beginning with the first postcaecal 

 segment. On the ventral face of the typhlosole is a large blood 

 vessel distended with blood. 



The last pair of hearts is in xiii. There are masses of nephridia in 

 V and vi and large lymph glands in the intestinal segments. 



The testis sac of x is unpaired and ventral. The testis-sac of xi 

 is U-shaped, the limbs of the U reaching to the dorsal blood vessel. 

 The seminal vesicles of xi are within the testis sac of xi, surrounded 

 by a thin layer of testicular coagulum. There is only a small 

 quantity of testicular coagulum in the testis sac of x. 



The seminal vesicles are medium-sized vertical bodies, each with 

 a deep dorso ventral groove on the posterior face. Each vesicle is 



