1908.] W. MiCHAßi,SEN : OUgochœta of the Indian Empire and Ceylon. 



221 



EUTYPHOEUS QUADRIPAPII.I.ATUS, MlCHI^SN. 



E. q., MICHAELSEN, in Mt. Mus. Hamburg, xxiv, p. 175, f. 19. 



Examined many specimens. 



External Characters.— Dimensions: I^ength 60—70 mm., greatest thickness 

 3I mm., number of segments 120 — 155. 



Colour in general yellowish green at the anteclitellar region, with a very light 

 rose tint. • 



Setae all at the ventral side of the body, the median dorsal distance being larger 



than half the circumference {dd = ca. ju) 



Setse paired but not very strictly, in general, 

 C(i = 4 : 2 : 4 : 3. At the hinder end of the 



in the middle of the body, aa : ab : be 

 body ab and c^nearly as large as be. 



First dorsal pore on the intersegmental furrow 11-12. 



Clitellum indistinctly saddle-shaped, at least in the hinder parts. In the 

 fore part of the cHtellar region the ventral side is sometimes also somewhat glandular, 

 but less so than the clitellum proper ; clitellum occupying segments 13 or f of 13—17 

 (=5 or4f). 



Male pores on the 17th segment on sharply bordered transversely oval, promi- 

 nent papillse which extend between the lines of setse a and b, transgressing the latter, 

 their summits lying only a little medial from the lines of setse b. 



Female pores just before the setse a of the 14th segment. 



Sperma thecal pores one pair on the intersegmental furrow 7-8 on small 

 transversely oval papillse between the lines of setse a and b, somewhat nearer to the latter. 



Copulatory organs: Apparently constantly two pairs of transversely oval 

 papillse or glandular areas on the intersegmental furrows 13-14 ^^^ 

 14-15 in about the lines of setse b, only in one of the sixteen mature 

 specimens the second pair of copulatory organs was represented 

 only on one side, the glandular area of the other side being absent. 



Internal Anatomy. — Septum 4-5 strong, 5-6 very strong, 

 6-7 and 7-8 missing, 8-9 hardly strengthened, 9-10 moderately strong, 

 less than 4-5, lo-ii very little strengthened, rather tender, 11-12 

 tender, hardly thicker than the following very tender ones. Septa 

 9-10 and lo-ii approach one another in the middle, but are not 

 imited. 



Alimentary tract: A big gizzard between septa 5-6 and 

 8-9. (Esophagus swollen in the 12th segment, containing a pair of 

 big lamellated calciferous glands depending from the wall into 

 the lumen. Intestine beginning in the 15th segment, sacculated 

 laterally in the anterior part, with a small simple typhlosole begin- 

 ning further back. 



Circulatory system: I^ast hearts in the 13th segment. 



Nephridial system micronephric. 



Fig. 25. 



Eutyphoeus quadri- 

 papillatus. 



