DESCRIPTIONS OF EARTHWORMS. 139 



setae (fig. 1) have the usual shape, though they are but 

 slightly curved ; they measure 1 mm. in length. The free 

 extremity of each seta is furnished with crenulated, arched 

 markings like in several Geoscolecidae. Moniligaster Hou- 

 tenii has also its setae ornamented, though on a somewhat 

 different manner ; moreover they are straighter and smaller. 



As to the genital pores only those of the spermathecae 

 and those of the male genital ducts have the position normal 

 for the genus (fig. 5). The spermathecal pores, situated 

 in the intersegmental groove VII/VJII , in the series of the 

 dorsal bristles , are very obvious , button-hole-shaped ; the 

 male |:ores however are very narrow slits in the inter- 

 segmental groove X/XI , corresponding to the interval be- 

 tween the ventral and dorsal setae. The oviducal pores 

 are two small but distinct slits upon segment XIII , in 

 front of the ventral bristles. In this point our specimen 

 does not agree with the other 7l/ow^'%asfór-species , which 

 have the oviducal pores situated in the intersegmental groove 

 XI/XII, and therefore separated from the male pores only 

 by a single segment; nevertheless there cannot be a mis- 

 take , for in the dissected worm I could distinctly recog- 

 nize the oviduct on its course to the external opening. 

 The nephridial pores were not visible externally, still on 

 examining the internal structure , I could state , that the 

 nephridia open themselves on the exterior in line with the 

 ventral setae, and not with the dorsal ones, as in Moni- 

 ligaster indicus. 



As first stated by myself in Monilig. Houtenii , so also in 

 the present species the internal segmentation does not cor- 

 respond to the external one, due to the shifting of several 

 septa. Benham observed the same feature in Moniligaster 

 indicus , and according to Rosa it occurs also in Desmo- 

 gaster '). The shifting commences with the ninth septum , 

 that instead of being inserted in the intersegmental groove 

 IX|X is attached to the body- wall about in the middle of 



1) Ann. Mus. Civ. Stor. Nat. Geneva, 2e S. Vol. IX, 1890, p. 368, PI. XII. 

 Notes from tbe Leyden üMuseura, Vol. X.VI. 



