ON MEGASCOLEX CCEEULEtJS. 83 



where this latter opens to the exterior. They are ciliated in- 

 ternally. 



Prostates. — The prostates are small relatively to the size 

 of the worm and very compact, and each is provided with a 

 very short muscular duct. 



Seminal Reservoirs. — There is a single pair of seminal 

 reservoirs (fig. 3) which lie in segment xii. It is very unusual 

 to find a single pair only among the Perichsetidse. 



Ovaries. — The ovaries lie as usual in segment xiii, attached 

 to the anterior ■ septum hounding that segment. They are 

 very large. 



Oviducts. — The oviducts are very small, and open in- 

 ternally in segment xiii near the nerve-cord; they then pass 

 through septum xiii . xiv and penetrate the body-wall, and 

 open to the exterior by the pores described above in seg- 

 ment XIV. 



Spermathecse. — There are two pairs of spermathecse 

 which are of the same size and shape. They are pear-shaped, 

 and lie in segments viii and ix.^ Each possesses a small 

 csecum, which might entirely escape observation in a dissection, 

 as it is completely embedded in the wall of the sperraatheca 

 itself at its basal region. It is very obvious in sections, and 

 contains spermatozoa, while the spermatheca itself is empty in 

 my specimen. The existence of these caecal diverticula bears 

 out the views recently expressed by Beddard on this subject. 



Accessory Glands. — There only remain to be mentioned 

 the two pairs of small glands which open between segments 

 XVII and xviii and xviii and xix. 



These I have ascertained to be small solid glands composed 

 of clear-looking cells which are not stained by borax-carmine. 



* There has occasionally been some confusion as to the segment in which 

 the spermathecfe lie. They usually open in the groove betweeu two seg- 

 ments and belong to the posterior of these two segments, but the septum is 

 deficient just here, and they may occasionally be found pushed forward into 

 the anterior of the two segments ; but whenever I have found such to be 

 the case I have pulled them back through the aperture in the septum, and it 

 has become evident that they really belong to the more posterior segment. 



