232 DESCRIPTIONS OF EARTHWORMS. 



increasing, so that the segments in front of the clitellum 

 are twice as long as those of the cephalic region. The seg- 

 ments of the caudal region are short , closely pressed toge- 

 ther, with a prominent ridge of setae, giving to this 

 portion of the body a somewhat serrated appearance. 



The clitellum occupies the usual number of segments 

 14 — IG; but neither the intersegmental grooves, nor the 

 setae are visible upon it. The dorsal pores appear to be 

 absent in the anterior body-region ; the first of them is 

 situated in front of the clitellum, between the 13th and 

 14th ring. 



There are four conspicuous pores of the spermathecae on 

 each side of the body , between the segments 5 and 6, 6 and 

 7, 7 and 8, and 8 and 9. 



A single oviducal pore is situated on the ventral side of 

 the 14th segment. The male generative pores (fig. 1) upon 

 the 18th ring are surrounded by a glandular area, which 

 extends over segment 17 and 19 and bears several copu- 

 latory papillae. The 17th and 19th segment each have a 

 pair of papillae situated just in the series of setae; behind 

 each papilla upon segment 17 and in front of those of 

 segment 19 there is a transversal sucker-shaped groove. The 

 large papillae of segment 18, bearing the male pores , just 

 correspond in position with these grooves ; moreover this 

 segment has another pair of small low papillae situated on 

 each side of the ventral median line and in front of the 

 circle of setae. At the ventral side of segment 7 and 8 

 there is a pair of inconspicuous papillae, situated behind 

 the row of setae. 



The setae are arranged in a continuous row; in the seg- 

 ments succeeding to the clitellum their number is about 80, in- 

 creasing in those of the caudal region to 90. On the contrary in 

 the anterior segments their number is gradually diminishing. 



Concerning the internal anatomy could be stated , 

 that the 5th , 6th and 7th septum are specially thick- 

 ened and funnel-shaped , entirely bidding the oesopha- 

 gus. The 7th septum does not exactly originate from the 



Notes from the Leyden IMuseum , "Vol. XII. 



