316 Mr. E. I. Pocock on 



armature the same as in 0. madagascariensis, except that 

 there is a spine on the lower angle of the tarsus instead of a 

 stout bristle. 



Genital operculum wider than long, without median suture. 



Pectinal teeth 8. 



Length 70 millim., of carapace 11, of tail 28, of hand- 

 back 10, of movable digit 9'5 ; width of hand 7*6. 



A single female example from South Central Madagascar 

 (J. L. Last). 



Genus Hadogenes, Kraepelin. 

 ( = Ischnurus of all authors, except C. Koch.) 



Hadogenes paucidens, sp. n. 



It is needless to describe this species at length, since it 

 seems to differ from the South-African forms that Kraepelin 

 has described under the name trichiurus in the spine-armature 

 of the fifth caudal segment. In trichiurus the inferior keels 

 of this segment are furnished with a considerable number of 

 small teeth, there being upwards of 15 or more smallish teeth 

 on the median keel and upwards of 9 or 10 similar teeth on 

 the lateral keels ; but in paucidens there are only 5 much 

 larger teeth on the median keel and 4 or 5 large ones on the 

 lateral keels. The teeth on the lower surface of the second 

 caudal segment also larger and fewer. 

 Number of pectinal teeth 14 or 15. 



Measurements in millimetres of type. — Total length 119, of 

 tail 56, of carapace 15; width of hand 10; length of hand- 

 back 16, of movable digit 14. 



hoc. West Africa {type Keyserling Coll.). 

 In addition to the example described above the Museum 

 has a couple of dried specimens from the Congo {A. Currer, 

 Esq., R.N.) which appear to belong to this species, since they 

 present the same armature of the caudal segments. One of 

 these is very young, measuring only 39 millim., and possesses 

 19 pectinal teeth ; the other, which appears to be a not quite 

 adult male 86 millim. in length, has 24 or 25 pectinal teeth. 



The following are the distinctive features of the remaining 

 specimens of this genus contained in the British Museum : — 



Firstly, a male 101 millim. long, of which the tail is 60 and 

 the carapace 10 (pectinal teeth 16 and 17) ; and a female 84 

 millim. long, of which the carapace is 11 and the tail 44 

 (pectinal teeth 14). These two examples, which have no 

 locality, are evidently sexes of the same species, and by the 

 strong lobation of their digits appear to be adult. There is 



