ZOOL.-VOL. II.] EISEN—OLIGOCHMTA. 213 



Internal Characters. — The diverticle of the sperma- 

 theca joins the latter at the junction of the muscular and 

 glandular part or in the muscular part (specimen from 

 Samoa). In the species the junction is much higher up 

 and on the glandular part. The muscular duct in both the 

 species and the variety is comparatively long. The ventral 

 ganglion in the specimen dissected is greatly enlarged in 

 somite X. Of the constancy of this enlargement I am not 

 certain. The nephridia differ considerably from those of 

 the species. They are shorter and do not extend as far 

 dorsally. The ventral nephridium possesses only two 

 ccelomic mantles, while in the species it has three or four. 

 Two figures (figs. 77 and 81) are given, illustrating their 

 comparative size and form. 



Diverticles of the Intestine. — The pair in XVII is the 

 largest, and opens separately into the intestine. The pair 

 in XVI is next in size. The pair in XV is the smallest and 

 being connected with the pair in XVI can only be regarded 

 as a projection of the latter, the two opening through one 

 pore on either side into the intestine. 



Benhamia nana Eisen. 



Plate X, Fig. 76. 



Calciferous Diverticles. — A re-examination of my slides 

 of this species has been made in order to compare its cal- 

 ciferous diverticles with those of the species described in 

 this paper. These glands are shaped very much as are 

 those in Benhamia Bolavi, var. pacijica, and there is a very 

 small lobe projecting forward from the diverticle in XVI 

 into somite XV. This lobe is connected with the diverticle 

 in XVI by a ciliated duct which joins the ciliated duct of 

 the diverticle in XV, which enters the intestine at the same 

 point as the duct from the diverticle in XVII. The septa 

 from the surrounding somites bunch together at this point 

 and are besides very thin and diflficult to separate. The 

 figure of the diverticle of B. Bolavi, var. -pacifica, given in 



