6y0 MR. F. E. BEDDARD ON NKW [DeC. 20, 



I name the species 



6. Acanthodrihis aquarum-dulcium, n. sp. 



I need not trouble to give a detailed description of this species, 

 but will merely indicate the differences which it shows from A. falc- 

 landicus. It is in the first place a much smaller species ; the 

 measurements of a full-sized specimen are as follows: — Length 

 47 mm. ; breadth 3 mm. ; number of segments 90. 



The species is altogether of a more slender build than A. faldan- 

 clicus and has thinner body-wall. The two atrial pores of each side 

 are connected by a groove in which lies the pore of the sperm-duct; 

 this latter pore, as in A. falclandicus,\s ^mt outside the ventral setee 

 which are present upon the xviiith segment, though of course 

 absent or perhaps rather replaced by the penial setae on segments 

 xvii. and xix. Between the ventral setae on the xviiith and on the 

 xxth segments are a pair of small papillae. I did not find any 

 papillae in the neighbourhood of the spermatothecal orifices. 



The internal anatomy hardly differs from that o{ A. faldandicus ; 

 there are, however, no thickened septa ; the sperm-sacs may be 

 different, but I was not able to make out their arrangement accurately. 

 I observed egg-sacs in segment xiv. The principal difference 

 between this species and A. falclandicus concerns the penial setae. 

 In tlie present species they have only a very faint ornamentation at 

 some little distance from the free extremity. The large tubercles 

 characteristic of A. falclandicus are entirely absent ; there are merely 

 a series of minute spines with their apices directed downwards. 



7. Benhamia whytei, n. sp. 



Amontr a large quantity of insects and other invertebrates collected, 

 for Mr. H. H. Johnston, C.B., by Mr. Alexander Whyte, F.Z.S., in 

 Nyassaland was a single example of an Earthworm evidently belong- 

 ing to the genus Benhamia, which I cannot identify with any of the 

 African forms described by Michaelsen. The specimen was unfor- 

 tunately not in a snfiiciently good state of preservation to admit of 

 an exhaustive account of its structure ; but I have been able to 

 ascertain some of the principal characters which serve to discrimi- 

 nate it from the other African species of the genus. 



The specimen is 2| inches long and is of a dark brown colour. 



The prostomium is not prolonged over the buccal segment ; the 

 dorsal pores commence very early between segments iii./iv. 



The clitellura occupies segments xiii.-xix. ; on the ventral side 

 the male pores are surrounded by a circumscribed area, as in other 

 species of the genus ; within this area there is no development of 

 glandular tissue. 



The apertures of the atria are as usual upon segments xvii., xix. ; 

 the orifices are circular and each is surrounded by a circular rim ; 

 the two apertures of each side are connected by a groove; the 

 ventral setae of the three segments xvii., xviii., xix. are absent. 

 Their place is taken on the xviith and the xixth segments by the 

 penial setse. 



