34 ART. 4.— EKITARO NOMURA : 



into segment XVII. Its minute structure is similar to that of 

 the sperm- sac. In fully mature specimens it always contains 

 eggs, which are going through the process of maturation and 

 contain numerous yolk granules. 



7). Oviducts. To the statements of Hatai it may be added 

 that the oviducts lie in the same longitudinal line with the 

 ventral seta-bundles. The hinder margin of the funnel is in 

 contact with the anterior face of septum XI/XII. The cells of 

 the wall of the oviduct are arranged radially around the external 

 pore and always contain a compact cytoplasm. 



Pakt II. Idmnodrilus willeyi, n. sp. 



1. Description. 



Colour of the body red, shaded posteriorly with light gray 

 or yellow. In the posterior part of the body are seen very fine 

 transverse striations due to septa, which are less numerous than 

 in L. gotoi. Prostomium somewhat conical. Segments I-V 

 always biannulate, anterior annulas longer. Brain almost square, 

 emarginate posteriorly. Clitellum forming a complete ring, usually 

 in segment XI, but sometimes occupying two segments and 

 always including segment XI. Setae sigmoid, furcate ; branches 

 curved ; upper branch longer "and larger than the lower. Each 

 seta-bundle in the anterior segments consists of 4-6 setae, in the 

 middle part of 1-3, and in the posterior of 1-2. Five pairs 

 of septal sacs on the ventral side of the intestine, attached to 

 the posterior faces of septa V/VI-IX/X. Pharyngeal glands well 

 developed. Pharynx in segment -J II and III. (Esophagus in 

 segment IV. Intestine and chloragogues commence in segment 

 V. The nephridia of segment VIII are sometimes racemose in 

 appearance. Prostata spindle-shaped, about as large as the 

 atrium. Chitinous penis sheath 3-4 times as long as its diameter 

 at the proximal end ; circular in cross section all through. 

 Anterior sperm-sac in segment IX, unpaired. Posterior sperm- sac 

 in segment XI only, unpaired. Spermathecae in X, paired ; 

 spermatophores always present during the breeding season. Body 



