1908.] W. MiCHAELSEN : Oligochœta of the Indian Empire and Ceylon. 235 



EUTYPHOEUS BENGAI^ENSIS, M1CHI.SN. 



(Plate xiv, figs. 47, 48.) 



E. b., MICHABLSEN, in Mt. Mus. Hamburg, xxiv, p. 183. 

 Examined a single mature specimen. 



External Characters. — Dimensions: lyength 12 mm., thickness 2^ — 3I mm., 

 number of segments ca. 185. 



Colour at the anterior segments dorsally rather dark smoke-brown, at the other 

 parts of the body yellowish brown. 



Head prolobous. Prostomium transversely oval, nearly circular, calotte-shaped. 



Setse minute, rather widely paired. Median ventral distance nearly equal to the 

 middle lateral distance and twice as wide as the distance between the setse of a pair 

 {aa=2ab=bc=2cd). Median dorsal distance equal to about three-fifths of the circum- 

 ference of the body. 



Dorsal pores present. 



Male pores in the 17th segment, in deep, broad transverse clefts, the centres of 

 which coincide with the lines of setse b. These clefts are bordered above and below by 

 thick lips which somewhat transgress the limits of the 17th segment and which are con- 

 nected by low, narrow, transverse bridges, the two clefts of the male pores being con- 

 nected by a transverse furrow. 



Spermathecal pores in the intersegmental furrow 7-8 (between the lines of 

 setse b and c ?). 



External copulatory organs are not present. 



Internal Anatomy. — Septa 4-5 and 5-6 strengthened, especially 5-6 ; septa 

 6-7 and 7-8 missing, 8-9 — lo-ii rather strong, especially the latter two. 



Alimentary tract: A big gizzard between septa 5-6 and 8-9. (Esophagus 

 with broad lateral calciferous glands in segment 12. The calciferous glands are not 

 set off from the oesophagus, but are lateral swellings of it, their lumina being hardly 

 separated from the main lumen of the œsophagus. Intestine with broad lateral sac- 

 culations, without typhlosole in the anterior part (examined only as far as segment 26). 



Circulatory system: Dorsal vessel simple. Last hearts in the 13th segment. 



Nephridial system micronephric. 



Anterior male organs: One pair of testesandsperm-duct-funnelsfree (?) in the 

 nth segment. One pair of large, lobed and incised sperm-sacs depending from sep- 

 tum 11-12 backwards through several segments. 



Prostates long slender tubes ; glandular part longer and coiled ; duct somewhat 

 thinner and much shorter, forming two wide loops. 



Penial setse (fig. 48) ca. 3 mm. long, proximally 20 /' thick, distally hardly 

 thinner, just before the distal end still 17 a« thick. The penial setse are strongly but 

 simply bent, forming nearly a semicircle. The distal extremity bent somewhat more 

 strongly in the same direction, ending in a strong, simple prong. Below this prong 

 the seta is enlarged and excavated in the concave side like a spoon. There is no 



