22 DESCRIPTIONS OF EARTHWORMS. 



within this depressed field , are connected by a brace-shaped 

 groove , at the concave side of which lie two papillae (fig. 1) ; 

 moreover another pair of papillae is to be found in the 

 anterior and the posterior part of the area. These four 

 pairs of papillae are even visible in badly preserved spe- 

 cimens, where the ventral area is hardly recognizable. In 

 front of the clitellum three unpaired , transverse copulatory 

 papillae occur in the ventral mesial line ; they lie in the 

 intersegmental grooves X/XI, XI/XII and XII/XIII, but are 

 rather indistinct in some specimens. Dorsal pores present, 

 but hardly visible. 



Two pairs of spermathecal pores are situated in 

 the intersegmental grooves VII/VIII and VIII/IX ; the pores 

 of each pair lie next to each other, upon a white area, in 

 a position which corresponds to the interval between the 

 ventral pairs of setae. 



The setae are situated ventrally, visible behind the 

 clitellum as four white spots; the interval between both 

 v^entral couples nearly equal to that between the ventral 

 and dorsal ones. In front of the clitellum the ventral in- 

 terval is smaller than the lateral one. 



The penial setae, a fascicle of which arises next to 

 each prostata-gland , present an appearance, quite difi'erent 

 from that of the ordinary setae ; they are of a golden 

 yellow colour, except at the distal end. Each seta (fig. 2) 

 is faintly bent, has a length of 3 mm., and is of about the 

 same diameter over its whole length, except at the distal 

 extremity, which is dilated like a spatula. The distal half of 

 the seta is beset with small , densely crowded spines (fig. 2d). 



Besides the penial setae our species possesses another kind 

 of modified setae , which are situated in front of the anterior 

 spermatheca and replace the ventral setae of segment VII; 

 these copulatory setae are connected with the body- wall 

 by a strong muscle-fascicle , and are accompanied by a glan- 

 dular body, that has a pyriform shape and presents longitudi- 

 nal grooves (fig. 4). Each copulatory seta is faintly curved like 

 a penial seta, but is not so slender; its length is 2\'2 mm. 



Notes from the Leyden IVIuseum, Vol. XVII. 



