ZooL.— Vol. II.] EISEN—OLIGOCBMTA. 219 



The sefta are only very slightly thickened in some places. 

 The septal formula is as follows: — 



VI/VII, VII/VIII, VIII/IX, IX/X, xTxT, XI/XII, 



XII/XIII, XIII/XIV. 



The dorsal -pores are large and distinct even to the last 

 somite of the tail. 



The diverticles of the intestine are large, rounded and 

 oblong, without indentations. Each diverticle opens inde- 

 pendently into the intestine and is not connected with the 

 other. The posterior ones are the largest. All are of the 

 same structure, containing no crystals, only lime globules. 



The spermatheca consists of a main sac, tubular in form 

 and much twisted. There is a small wart-like diverticle at 

 the base of the posterior spermathec^, but this diverticle is 

 not seen in the anterior pair. In both pairs there is a large 

 diverticle inserted below the centre of the main tubular sac. 

 The diverticle is enlarged at the apex. The apex of the 

 main tubular sac is enlarged, with an outer, irregular outline 

 and with an interior racemose chamber. 



The prostates are thick and the glandular part is com- 

 posed of two layers of cells. They open in the equator of 

 their respective somites. The sperm-ducts are fused in 

 XVII and covered with a strong muscular investment. 

 There are no sperm-sacs, only sperm-masses. 



The last hearts are in XII. 



The genital zone is rather indifferently preserved in the 

 single specimen. It is square and considerably depressed. 

 In each of the depressed somites is seen an elevated ridge 

 connecting the setae, but somewhat broken in the median 

 line. The ovipores could not be distinguished. 



Benhamia guatemalae, sp. nov. 

 Plate XIV, Figs. 172-174. 



Definition. ~\.&c\^gih 40 mm., width 2 mm. Somites 127. Prostomium 

 divides somite I about one-third. Most anterior dorsal pore XII/XIII. C!i- 

 tellum in XIII-XX. Genital zone a round depression, with four small papillae 



