GIBBONS : ON NEW E. AFRICAN LAND SHELLS. 1 4^ 



mark of subfossil shells which belong to species still living in 

 the surrounding seas. I obtained 5 land shells from Bawri; 3 

 species of Biiliminus^ all peculiar, but two having nearly allied 

 species at Zanzibar; S. lucida, also peculiar, and a Pupa, which is 

 the only species I found common to Zanzibar. Chapani Island 

 is nearer Zanzibar and boasts of a small Baobab tree; here I 

 obtained Nanina Mozambicensis, var., B. piuictatus, van, and the 

 following common to Zanzibar : — B. Mozambicensis, var., B. 

 tumidics and Cyclostomus Zanguebaricus. A third islet, visited 

 once, yielded A. allisa only. 



Cyclostomus Zanguebaricus, Petit. 

 Mozambique and Zanzibar. At the former place it is common 

 on the trunks of trees, old walls, &c. At Zanzibar it is scarce 

 and local, and the shells are rather different, being larger and 

 more tumid, with a less distinct suture. Variation in color and 

 markings is sometimes considerable — specimens may be seen 

 almost pure white and without bands, others a deep golden color. 

 C. Zanguebaricus appears to be a favorite food of birds. Large 

 numbers of empty shells may often be seen round a stone, with 

 the last whorl broken open a short distance from the aperture. 



Cyclostomus Kraussianus, Pfr. 

 I found this Natal species at Inhambane. 



Cyclostomus calcaneus, Sow. 

 Mozambique. Livingstone and Kirk found it up the Zambesi, 

 and on Lake Nyassa.''^ " Between 4° S. and 4° N. lat. ; locality 

 doubtful," by Captain Spekef. On the Island of Mozambique it 

 is now extinct and specimens are only to be obtained in a sub- 

 fossil condition from a sandy formation at one end of the island. 

 There shells are very numerous, but I failed to obtain an oper- 

 culum. 



* Proc. Zool. Soc, Feb. 28, 1865. f Ibid, 1864. 



J.C , ii., May, IS/"!). E 2 



