102 RHINODRILUS TENKATEf. 



characterized by having the cephalic lobe prolonged in a 

 small muzzle and by its setae , which , instead of being 

 smooth , are provided with chitinous arches over their 

 distal portion. 



Our examples are about as large as our common earth- 

 worm; the longest specimen measures 115 ra.ni. and the 

 number of its segments is 160. The anterior third part 

 of the body is cylindrical , but its posterior two-third is 

 rather flattened. The cephalic lobe (fig 4) has the shape of a 

 little muzzle, 2 m.m. in length; however this character is 

 not visible in all the spirit-specimens , in some of them 

 the prostomium is entirely retracted , in others it looks 

 like the cephalic lobe of a Lumbrinis-STpecimen. The se- 

 cond segment is very short , but the ten following rings 

 are very long , and marked by a transverse groove ; those 

 of the remaining part of the body have only half their 

 length. The colour of the animal is usually reddish brown 

 on the dorsum , yellowish at the ventral side , moreover 

 several examples show an olive-green ring around the body 

 from the 12ih (U'h)- 15th (I6th) segment. The external 

 apertures of the nephridia are very obvious, situated close 

 behind the anterior margin of each ring , near the dorsal 

 pair of setae ; in the anterior segments , where the segmen- 

 tal orifices are the largest, they lie somewhat upwards 

 from the dorsal bristles, bat in the 13^^ and following 

 segments they lie in one line with them. The first ne- 

 phridiopore is visible on the 3rd ring ; jn front of this 

 orifice there is a narrow, longitudinal groove , running over 

 the second segment. The setae are arranged in 4 series ; 

 the distance between the two ventral pairs is somewhat 

 larger than that between a ventral and a dorsal pair. In 

 each dorsal pair the setae are placed close to each other , 

 in the ventral pairs there is a distance of about ^/j m.m. 

 between them. 



The clitellum is fully developed only in two specimens 

 and extends from the 20tt {2l^i)—2Qi^ (27th) segment; 

 at the dorsal side there is not much visible of the glan- 



Notes from the Leyden Museum, Vol. IX. 



