DESCRIPTIONS OF GENERA AND SPECIES 563 



single ; jive hearts in X-XIII. Two pairs of sperm-sacs in XT, XII. Penial setae with 

 numerous transverse rings of minute points. Spermalhecae without recognizable diverticula. 

 Hob. Liberia. 



This species undoubtedly comes very near to B. rosea; indeed, I am almost 

 inclined to believe that a careful comparison would show them to be the same 

 species. The only difference appears to be the ornamentation of the penial setae in 

 the present worm, and the absence of any ornamentation in -B. rosea; the first 

 dorsal pore, however, is further forward in B. rosea; and for the present I keep 

 the two forms apart though without any strong conviction that this course is the 

 right one. It also comes near to B. buttikoferi. It has formed the subject of two 

 contributions by HOEST (1, 2). 



(2) Benhamia buttikoferi (HORST). 

 Acanthodrilus Biittikoferi, HOKST, Notes Leyd. Mus., ix, 1887, p. 291. 



Definition. Length, 320 mm. Clitellum, XIII (XIV)-XIX, with median ventral area, 



uninvaded by the modified epidermis, upon XVI-XIX. Setae paired; the two pairs of 



one side closer together anteriorly than in the posterior segments, as is also the case 



with B. beddardi. Proslomium continued by grooves on to buccal segment. Dorsal 



' pores visible behind the clitellum. Two gizzards present lying in V and VII ; three 



pairs of calciferous glands in XIV, XV, XVI. Septa separating segments VI/XII 



specially thickened. Mucous glands apparently present. Dorsal vessel single ; four pairs 



of hearts in X-XIII. A single pair of sperm-sacs in XII. Penial setae swollen at 



free extremity, and ornamented with a series of spinelets, the apices of which are 



directed forwards. Spermathecac without apparent diverticula. Hab. Liberia. 



In addition to the above reference, see HORST (4). 



(3) Benhamia beddardi (HORST). 



Acanthodrilus Beddardi, HORST, Notes Leyd. Mus., x, 1888, p 123. 



Definition. Length, 160 mm. Clitellum, (XIII) XIV-XIX (XX), saddle-shaped. Prostomium 

 rather long. Setae strictly paired. Two gizzards and three pairs of calciferous glands 

 in XIV, XV, XVI(I). Mucous glands present. Dorsal vessel single, four pairs of 

 hearts. Penial setae ornamented at extremity with numerous spinelets, the apices of 

 which are directed towards the free end of the setae. Spermathecae with several minute 

 diverticula 'only obvious in transverse sections' In the neighbourhood of the spermathecae 

 are two bundles of copulatory setae accompanied by glands. Hab. Liberia. 



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