CONNOLLY: MOLLUSCA FROM NORTHERN TRANSVAAL. 77 



Achafina cf. greyi, Da Costa. 

 1907. Achatina greyi, Da Costa, Proc. Make. Soc. vii, p. 226, pi. 20, 

 fig. 1. 



Hah. — Sibasa. 



Two examples, apparently conspecific with, tlie single shell from 

 Salisbury, which I recorded in 1912 under the above name. The 

 fresh material, however, casts considerable doubt ou the correctness 

 of that record, though not affecting the synonymy which accom- 

 panied it. The shells are much larger (85 X52 mm.) than any of the 

 Types of the (jreyi group, and if it can be proved that the latter are 

 a truly small race, rather than merely immature shells, it will not 

 be possible to retain the name for the Rhodesian and Transvaal 

 specimens. 



I hope to survey the puzzling craveni group, to which all the fore- 

 going belong, in a work now in course of completion, but the whole 

 subject is an extremely difficult one, partly owing to the 

 multiplication of new specific names on insufficient material, and 

 partly owing to the great alteration which takes place in the 

 appearance of an Achatinoid shell between the times when it is 

 fresh and comparatively young, and when it is old, dead, and 

 bleached, and it would be futile to embark on such an undertaking 

 without long preparation. 



Genus Tropidophora, Troschel. 

 Tropidophora insulare (Pfr.). 

 Hah. — Shilwane district. 



Craven's T. kraussianum, Pfr., doubtless refers to this common 

 species, 



EXPLANATION OF PLATE II. 



Fig. 



la~c. Trachycystis junodi, sp.n. x 4 J. 



2a, b. T. subpinguis, sp.n. x 5|. 



3a, b. T. shilwaneensis, sp.n. X 5. 



4a-c. Kerkophorus perfragilis, sp.n. x 3J. 



5. Gulella sibasana, sp.n. x 4^. 



6a, b. Edouardia drakenshergensis (Smith), x 1. 



