NEW GENERA AND SPECIES OF EARTHWORMS. 259 



Perhaps Benham's genus Eminodrilus will prove to belong 

 to this family. All these genera are natives of the tropical 

 parts of the Old World, particularly of Africa and Madagascar. 



3. Pygmaeodrilus lacuum, n. sp. 



I have had five or six specimens of this species, they were 

 obtained alive from Kew ; the habitat of the species is Lagos, 

 West Africa. 



§ External Characters. 



It is a small species, measuring about an inch in length, and 

 is composed of about 120 segments. The anterior end of the 

 worm (see fig. 14) is rather pointed, owing to the sudden in- 

 crease in diameter of the segments after the 3rd. The pro- 

 stomium is short, and rounded anteriorly ; it is continued by 

 grooves on to the buccal segment; these grooves (fig. 15) meet 

 at an acute angle. The real demarcation between the pros- 

 tomium and the peristomial segment is perhaps the transverse 

 groove shown in the figure. There are dorsal pores which 

 commence at any rate at the posterior boundary of the 6th 

 segment, if not before. 



The clitellum is extensive ; it begins at the middle of Seg- 

 ment 13, and extends as far as the middle of Segment 26, 

 occupying therefore thirteen segments; it is only developed 

 on the dorsal side of the body : the ventral region between the 

 ventral setae is covered with epidermis which has the structure 

 of that on the non-clitellar segments. 



The setae are paired ; they show no modification upon any 

 segment or segments ; they commence as usual upon the 

 2nd segment of the body. The ventral setae of Segment 17 

 are absent. 



The first four segments of the body are not secondarily 

 divided into annuli ; Segment 5 is biannulate ; the next four 

 are triannulate ; the next few are divided by furrows into about 

 five annuli. 



The only apertures visible upon the exterior of the body are 

 those of the spermatothecae and the atrial pores. 



