CHINESE EARTHWORMS GATES 463 



on 5 specimens; the presetal markings of vii lacking on 2 specimens; 

 the postsetal markings of viii lacking on 1 specimen. Each marking 

 is circular, about 1 intersetal interval in diameter, of a grayish 

 translucence, delimited by a slight circumferential furrow and with 

 a peripheral rim porticfti slightly elevated. 



Intem.al anatomy. — Septa 5/6-7/8 are thickened; 10/11 strength- 

 ened but translucent; 11/12-13/14 slightly strengthened; 8/9-9/10 

 lacking. 



The intestine begins in xv (4 specimens). The intestinal caeca 

 are compound, glove-shaped. Each caecum is composed of 5-7 

 elongate and fingerlike secondary caeca. The dorsalmost secondary 

 caecum is usually longer than the other secondary caeca, but in one 

 specimen all the secondary caeca are of about the same length. The 

 secondary caeca usually have smooth dorsal and ventral margins, 

 but there may be one or two short but definitely fingerlike tertiary 

 <!aeca on the ventral margin of any particular secondary caecum. 

 The typhlosole begins just behind the caeca. 



There is a pair of hearts belonging to ix in one specimen; a 

 single heart belonging to ix in three specimens, on the right side 

 (1 specimen) or the left side (2 specimens). The last pair of 

 hearts is in xiii (4 specimens). The hearts of x are filled with 

 blood and readily recognizable. AU hearts of ix-xiii pass into the 

 ventral blood vessel. 



The testis sacs are unpaired and ventral. The seminal vesicles 

 of xi and xii are fairly large and are in contact transversely above 

 the dorsal blood vessel. Each vesicle has a well-developed primary 

 ampulla, conical to pyramidal in shape, the base of which is sunk 

 into the dorsal margin of the ventral lamina. The ampulla is deeply 

 constricted off from the ventral lamina, in one specimen the two 

 portions of the vesicle connected only by a slender cord. The 

 prostates extend through some or all of segments xvi-xxii. The 

 prostatic duct is 8-10 mm in length, bent into a hairpin loop, the 

 ectal limb much thicker than the ental limb. 



On the parietes just median to the ectal end of the prostatic duct 

 there are two transversely ovoidal masses of softish, glandular tissue. 

 Each of these masses can be separated, when all genital markings 

 are present, into two distinct masses, each with its own duct passing 

 into the body wall. Within or on the parietes but closer to the 

 prostatic duct are four smaller and more nearly spheroidal glandu- 

 lar masses, the stalks or ducts of which pass to the four genital 

 markings on the male pore area. 



The spermathecal duct is muscular, with a smooth, glistening, 

 pinkish appearance, the length equal to or less than that of the 

 ampulla. The diverticulum passes into the median face of the duct 



