120 T. R. R. StebbinG: The Fauna of Brackish Ponds. [Vol. II, 



here concerned, will stand near to Unciola, Say. It is, however, 

 more closely allied to Chevreuxius, Bonnier, being at the same time 

 sharply distinguished from that genus by the character of the 

 second uropods, which are here biramous, not as in M. Bonnier's 

 genus uniramous. 



Gen. GrandidierelIvA, Coutiere. 



1904, Grandidierella, Coutiere, Bulletin de la Soc. philoniathtque, 



ser. 9, vol. vi, p. 173. 

 1906. Grandidierella, Stebbing, Das Tierreich, " Amphipoda," 



P- 739- 



The genus is defined by M. Coutiere as follows :— 

 Body little compressed ; side-plates narrow. First antennae 

 with the first and second joints of the peduncle elongate, the third 

 joint short. Accessory flagellum one-jointed, very small. Second 

 antennse at -most equal to the preceding, fourth and fifth joints 

 of the peduncle elongate. Mandibular palp with second joint 

 slightly longer than first, and third than second ; mandibular pro- 

 cess narrow; cutting edge dentate. Lower lip with processes 

 of the external lobes long and conical. First maxillae with inner 

 plate almost obsolete, without trace of setae; outer plate with 

 eleven spines. Second maxillae having the inner plate furnished 

 with two fringes of setae. Maxillipeds having a series of spines on 

 the outer plate, the finger short, unguiculate. First and second 

 gnathopods subchelate, dissimilar; the first more robust than the 

 second, with marked sexual dimorphism affecting both size and 

 shape. Third, fourth and fifth peraeopods with second joint ex- 

 panded. The fifth peraeopod almost twice as long as the third. 

 Third uropods one-branched ; peduncle a little widened on the inner 

 side, shorter than the ramus. Telson emarginate, broader than long. 

 The species now to be added to the genus falls excellently 

 under the original definition. The sister species, as often happens, 

 are much less sharply separated in the female than in the male 

 sex ; but in both sexes they show a very clear distinction. 



Accessory flagellum of first antennae 

 nearly as long as first joint of primary : 

 wrist in first gnathopod of male more 

 than twice as long as broad . . . . G. mahafalensis, Coutiere. 



Accessory flagellum of first antennae not • ■ 



nearly as long as first joint of primary : • • ■• 



wrist in first gnathopod of male not " 



nearly twice as long as broad . . . . G. honnieri, sp. nov. 



Grandidierella honnieri, sp. nov. 



(Plate vi.) - .- • ■ . - 



In preserved specimens the body is moderatel}^ compressed, 

 except when the marsupium of the female is much distended 

 with eggs. The lateral lobes of the head are rounded, carrying 



