ON A NEW SPECIES OF LITTORAL OLIOOCfLETA. 



23 



The dorsal pores are absent. 



The dorsal longitudinal blood vessel is single, giving oft nume- 

 rous lateral branches, or ventro-dorsal commissures. The two pairs 

 of the latter, situated in segments XII and XIII are dilated (hearts), 

 and are very conspicuous. A subneural blood-vessel does not exist in 

 the present species. 



The septa between the segments V-XIII are much thickened. 



In the alimentary tract the calciferous glands are absent. The 

 gizzard is but very feebly developed. The intestine begins in the four- 

 teenth segment. 



The nephridia are paired and commence in segment XIII. Their 

 pores open in front of the outer of the ventral pair of setae, and their 

 funnels lie in the segment preceding that which contains the main mass 

 of the organ. In segment XIV, the nephridia serve as oviducts. 



The spermathecce (fig. 4, sp.) occur in two pairs, in segments VIII 

 and IX. Each spermatheca has a diverticulum in the same segment. 



The spermatJiccal pores (fig. 1, sp.p.) are situated between segments 

 VII/VIII and VIII/IX. They lie in front of and outside the outer 

 of the ventral pair of setae, surrounded by a conspicuous elevation of the 

 body surface, so that they may easily be recognized at a glance. The 

 elevations just mentioned as well as the two pads in segment XVIII, 

 and also the genital papilla, are not well developed and therefore difficult 

 to find in young specimens of 40 mm. or so in length. 



The ovaries (fig. 4, o.), present in one pair, lie in segment XIII, and 

 are connected with the peritoneal epithelium on the posterior side of the 

 septum between segments XII and XIII. The ova are of various sizes 

 but even the largest are furnished with little yolk, and they are never of 

 considerable size. I have also observed some detached eggs in the 

 cavity of segment XIII. 



The oviducal pores (fig. 1, od. p.) open on segment XIV, in front 

 and a little outside, of the inner of the ventral pair of setae. The 

 funnels of the oviducts are situated in segment XIII. 



