1892.] SPECIES OF EARTHWORMS. 681 



The setse are strictly paired and are on the ventral surface. 



There are two gizzards, whose exact position I am not able to state. 



The calciferous glands are kidney-shaped ; there are three pairs 

 of them, in segments xv., xvi., xvii. The intestine commences lathe 

 middle of segment xviii. 



The dorsal blood-vessel is single ; there are three pairs of hearts, 

 in segments x., xi., xii. 



Six septa following the gizzard are thickened, but their increase 

 in thickness is not so well marked as it often is in Earthworms. 



The internal anatomy of this species is precisely like that of 

 Benharnia crassa above described ; the form of the penial setse, which 

 are the only structures by which some of these Benhamice can be 

 distinguished, were hardly different from those of Benharnia crassa ; 

 in the specimen from Dominica they were even twisted into a spiral 

 at the extremity, there were possibly rather more denticulations 

 on the end ; in the same way the end of the two vasa deferentia of 

 each side were enclosed in a common muscular sheath. 



It may be that the glandular csecum of the buccal cavity will 

 prove to be a character of generic value. I followed out the ducts 

 of the mucous gland, and find that each gland opens into the 

 pharynx by a wide aperture, which has, however, a shorter duct than 

 in Octoclicetus multiporus ; the opening is also situated further back 

 than in that genus ; besides the opening into the buccal cavity, the 

 mass of nephridial tubules, which I have called the mucous gland, 

 also open on to the exterior by numerous openings. 



1 should mention that in this species, as io B. crassa, the last pair 

 of hearts is in segment xii. 



8. Benharnia crassa, n. sp. 



Among a number of living Earthworms lately received from Kew, 

 whither they had been accidentally transported from Lagos, West 

 Africa, were two very small individuals, measuring about an inch in 

 length after preservation, which apparently belong to two distinct 

 species. Their appearance while alive was so very similar that I 

 regarded them as of the same species, and proceeded therefore to 

 examine one by means of a series of longitudinal sections, while the 

 other was cut into two halves and the viscera teased out. I had 

 hoped in this way to supplement by one method of study the results 

 obtained by the other. The two individuals, however, turned out to 

 differ in a slight degree, the difference being possibly of specific 

 value ; the difference mainly concerned the extent of the clitellum ; 

 in other points they appeared to agree. 



The prostomium is imbedded in the buccal segment, but it is not 

 continued by grooves over any part of this segment. 



The dorsal pores begin between segments v./vi. if not earlier. 



The clitellum commences in the hinder half of segment xiii., and 

 extends until the xxist segment ; only on the thirteenth segment is 

 it developed over the ventral as well as the dorsal and lateral surfaces ; 

 in the remaining segments there is an area, occupying the whole of 



