l-dO DESCRIPTIONS OF EARTHWORMS. 



segment X; the next following septum is nearly thrown 

 back a whole segment and is inserted close to the hinder 

 boundary of segment XI. In other Moniligaster-species the 

 tenth and eleventh septum meet with each other and are 

 confluent along a part of their surface ; in the enclosed 

 space the ovaria and the oviducal -funnel are situated. Mo- 

 nilig. coeruleus however shows a different feature, for the 

 eleventh septum is absent, or it is shifted to the middle of 

 segment XIII and there connected with the twelfth sep- 

 tum, the ovaria being enclosed in the intervening space. 

 As no uephidium occurs in the stretch between both 

 septa, I believe it may not be considered to correspond to 

 a somite. The septa of the succeeding segments are all 

 inserted in the body-wall slightly in front of the inter- 

 segmental groove. 



The septa V/VI, VI/VII, VII|VIII and VIII|IX are thick 

 and muscular like in other Monilig aster -^^qciqq ; moreover 

 the six septa behind the gizzard, XIX/XX — XXIV/XXV 

 show the same feature. This is also the case in M. Hou- 

 tenii, but I did not find it mentioned for one of the other 

 species. 



The intestinal canal as usually is characterized 

 by the presence of several gizzards; already in segment 

 XIII the wall of the gut presents a muscular appearance, 

 though its anterior bounding is not sharply marked and 

 a transition between the oesophagus and the gizzard seems 

 to occur as in Monilig. indicus. The gizzard extends till 

 segment XIX and shows five compartments, separated from 

 each other by an annular fibrous band. Behind the giz- 

 zard, in the region of the posterior thickened septa, the 

 intestine becomes narrow and cylindrical ; in segment XXV 

 it commences to enlarge, but is very deeply constricted in 

 the five following segments by the corresponding septa. 

 The lateral coeca , thus formed , are highly vascular and 

 are provided with a great number of parallel blood-vessels 

 by a branch of the dorsal trunc, which soon after its 

 origin divides itself fan-like in numerous smaller vessels. 



Notes from the Leyden JMuseum , Vol. XVI. 



