DESCRIPTIONS OF EARTHWORMS. 235 



darker on the clitellum; the ridge of setae on each seg- 

 ment is whitish. The longitudinal diameter of the segments 

 gradually increases from the head to the clitellum , so that 

 the segments 10, 11 and 12 are about twice as long as 

 the anterior segments. The male pores occupy the usual 

 position upon a large transverse papilla, situated just in 

 the row of setae. Each pore lies in the external half of 

 this papilla upon a small area, surrounded by a circular 

 groove; its internal half is occupied by a glandular mass. 

 There are two pairs of pores of the spermathecae in the 

 intersegmental groove of segment 7 and 8 , 8 and 9 , sur- 

 rounded by a small glandular area. The dorsal pores com- 

 mence between the 11th and 12th segment. No copulatory 

 papillae are visible. 



The setae form a continuous row , only with a small gap 

 in the ventral median line; their number upon the segments 

 in the vicinity of the clitellum is about 60, in the caudal 

 region however it increases to 75. Upon the ventral side 

 the setae are more closely placed than upon the dorsum 

 and about twice as long. There are no setae upon the 

 clitellum and the papillae of the 18th segment. 



The 5th, 6th and 7th septum are specially thickened; 

 the 8th one is absent, the 9th is membranaceous. This 

 9th septum , instead of originating from the intersegmental 

 groove of segment 9 and 10 , is inserted upon the middle 

 of the 9th segment , and pushed backwards by the gizzard. 

 That really the 8th septum is wanting may be concluded 

 from the fact , that the two pairs of spermathecae are 

 situated between the 7th septum and the next one. 



Each spermatheca is a pear-shaped pouch (fig, 4) with 

 a short excretory duct; next to it lies a tubular diverti- 

 culum, bent upon itself like a » Pan's pipe" and dilated 

 at its end in a small vesicle, which is filled with sperma- 

 tozoa. The sperm-sacs occupy the segments 10, 11 and 12; 

 they are not connected by a median sac, and the two last 

 pairs are specially large. The terminal portion of the vasa 

 deferentia is a S-like bent muscular duct of the usual shape. 



Notes frora th.e Leyden ]VIu.seu.m , "Vol. XII. 



