ZIMICOLARIA. 247 



The chief monographic work on Limicolaria is that of 

 Kobelt in the Conchy Uen Cabinet, 1894, comprising 47 species. 

 The East African forms have been thoroughly revised by 

 von Martens in his great work Beschalte Weichthiere Ost- 

 Afrikas, 1896. Mr. E. A. Smith has also contributed largely 

 to our knowledge of the genus, in numerous articles on 

 African mollusks, 1880 to the present time. In the present 

 work 71 species are admitted. 



Professor E. von Martens, in his work on the shell-bearing 

 mollusks of East Africa, remarks that the species are sep- 

 arated with difficulty and are still harder to diagnose, for 

 the general shape, as well as the sculpture and coloring, vary 

 widely in a series of specimens collected together. The shape 

 may be more or less swollen or slender, and not rarely ab- 

 normally drawn-out shells occur, which are conspicuously 

 small-mouthed. More rarely there are shortened forms. The 

 numerical proportion of the length of the shell to its width 

 may, therefore, vary remarkably among individuals of a 

 species, and also the proportionate length of the aperture to 

 that of the whole shell. 



The following species, described as Limicolaria?, belong to 

 the Buliminoid series, as shown by the penial accessory organs 

 of L. revoili, the anatomy of which has been figured by Bour- 

 guignat; no such structures are found in Limicolaria or 

 other Achatinida. 



L. revoili, with var. inflata ; L. gilbertae, L. rochebruni, L. 

 armandi, L. perrieriana, L. maunoiriana, L. milne-edward- 

 siana, L. leontinas, L. rabaudi, all of Bgt., and all from the 

 Ouarsanguelis Mts., Somaliland. See BGT., Moll. terr. et 

 fluv., pp. 40-52, in Revoil, Faune et Flore des Pays Comalis 

 (Afrique orientale), 1882. 



The species of Limicolaria may conveniently be grouped 

 geographically as follows : 



WEST AFRICA (Senegal to Angola), species 1-30. 



CONGO VALLEY, species 31-34, 61c, 62. 



NORTHEAST AFRICA (Upper Egypt, Abyssinia, Somaliland), 

 species 7c, lift, 35-49, 52. 



EAST AFRICA (Great Lake region eastward), species 50-70. 



