1899.] mOM BRITISH CENTRAL AFEICA. 587 



longit. tolius ^ cequans ; peristoma tenue, simplex, margine 

 columellari reflexo, umbilicum mediocrem partim ohtegente. 

 Longit. 21 millim., diam. 15; apertura 12 hnga, 7 lata. 

 Hah. Nyika Plateau, 7000 feet, Mount Chiradzulu and Zomba 

 Plateau, 5000 feet. 



Eemarkable on account of the spirally Urate protoconch, the 

 difference of sculpture of the normal whorls being sharply defined. 



29. BULIMIlfUS (CONTTLINTJS) METTJLOIDES, Sp. HOT. (Plate 



XXXIII. fig. 43.) 



Testa conica, angiiste umbilicata, tenuis, pallide fusco-cornea, nitida, 

 oblique tenuiter striata, ad apicem obtusa; anfractus 6-7, 

 rotundati, regulariter accrescentes, sutura leviter obliqua sejuncti ; 

 apertura fere perpendiculai'is ; peristoma tenue, simplex, mar- 

 gine columellari expanso et rejlexo, umbilicum semiobtegente. 

 Longit. 10 millim., diam. 6. 

 ffab. Zomba Plateau, 5000 feet. 



Closely allied to B. metula Martens S but, although larger, 

 consisting of fewer whorls. Professor v. Martens writes concerning 

 specimens sent for his examination : — " Very near to my metula, 

 but a little broader and lower than all ray specimens. Also the 

 umbilicus is a little broader in my examples." 



30. BtJLiMiNTJs BOiTiNi (Morelet). 



Olandina boivini, Morelet, Series Conch, p. 72, pi. v. fig. 5, 



Bidimus (Cerastes) mamboiensis. Smith, Ann. Mag. Nat. Hist. 

 1890, vol. vi. p. 153, pi. v. fig. 7. 



Hab. Nyika Eange, 7000 ft., Mount Chiradzulu, 6000-7000 ft., 

 Masuku Plateau, 6000-7000 ft., Malosa, 6000 ft., Zomba Plateau, 

 5000 ft. 



This species is very variable in size and form judging from the 

 series of specimens from the above localities. It also has a vdde 

 range, the type being found to the north at Mombasa. 



Dr. E. von Martens^ has erroneously placed the Buliminus 

 ptgohaxis as a synonym of this species, which does not possess the 

 distinct columeilar fold which is characteristic of that form from 



Ujiji. .... 



The following measurements will show the great variation in size 



which occurs in the present species : — 



Length. Width. Length of aperture, 



mm. mm. mm. 



(1) 25 10 9 



(2) 20 10 8 



(3) 14 n 6 



Number 1 consists of 8| whorls, no. 2 of 7g whorls, and no. 3 

 of 6|, all appearing equally adult. 



^ Weichth. Deutsch-Ost-Afrikas, p. 66, pi. iii. fig. 27. 

 * Beschalte Weichth. Deutsch-Ost-Afrikas, p. 61. 



