CHINESE EARTHWORMS GATES 



467 



Of the remaining nine (U. S. N. M.) specimens five have symmet- 

 rically paired markings on the locations indicated above. Four worms 

 lack one of a pair of markings. Of these last, two have one or two 

 unpaired, median, presetal mai'kings, one on viii, or one each on 

 viii and ix. On Kobayashi's specimen, in addition to the crescentic, 

 postsetal markings just in front of the spermathecal pores, there is 

 a presetal marking in ed on each side of viii and ix, a presetal mark- 

 ing in cd on each side of xviii, and a postsetal marking in jk on xviii 

 on each side. 



Internal anatomi/. — Septa 5/6-7/8 are thickly muscular; 8/9 com- 

 plete but thin, pushed posteriorly into a funnel-.shape by the gizzard ; 

 9/10 lacking; 10/11-12/13 thickly muscular; 13/14 slightly muscular. 



The intestine begins in xv, but when the gut is empty that portion 

 of the intestine anterior to 15/16 may be invaginated posteriorly into 

 the gut lumen of xvi, so that the intestine appears to begin in xvi or 

 with 15/16. If the gut m xvi is carefully opened the invaginated 

 portion can be pushed anteriorly into xv so that the origin in xv is 

 clearly rei^ognizable. The intestinal caeca are simple: the dorsal and 

 ventral margins smooth or constricted slightly by the septa through 

 which the caeca pass, occasionally the ventral margin provided with 

 a few slight additional incisions. 



One or both hearts of ix may be present. In either case the heart 

 or hearts are posterior to the first postgizzard septum, which must 

 therefore be 8/9. The hearts of x are present but are small and not 

 easy to find when empty, as they are bound to 10/11 by connective 

 tissue. In Kobayashi's specimen the left heart of x is filled 'with 

 blood and is as large as the heart (left) of ix. The right heart of x 

 is small and empty. The last pair of hearts is in xiii. All hearts of 

 ix-xiii pass into the ventral trunk. (Hearts of x were not found in 

 the type.) 



The lymph glands in xA'-xxvi are elongate, finger-shaped; from 

 xxviii posteriorly they are flattened, leaflike bodies, often biiobed 

 or trilobed. 



