300 Quarterly Jov.rJial of ConcJwlogy. 



C. Arabia and Socotra. This arid region has a pecuUar fauna 

 of the same cretaceous aspect that we noticed in North Africa, 

 though the genera are different. 1 1 species of BiiUminus^ 4 of 

 Otopoma, 2 of Tropidop/iora, and 3 of the pecuhar genus Lithidion 

 are its principal features. 



4. MADAGASCAR. This island is much better known now than 

 in Woodward's time, and if it has not fully come up to the rather 

 extravagant expectations formed, has at least furnished many fine 

 species. Its fauna is principally distinguished by the abundance 

 of magnificent species of Cydostomidce of typical form {Tropi- 

 dflphoi-a 24 species, Cydostoinus 30, Otopovia 3, Lithidion i), and 

 by Helices of the s.g. Ampelita /'including sepiilchralis, omphalodes, 

 etc.) 26, and the splendid s.g. Helicophauta {H. ?nagfiijica, Souver- 

 biana, etc.), 9 species. The genus Euptychia, recently described 

 by Crosse and Fischer, is very curious, possessing transverse 

 lamellae, the only other instance of this in the Cydostomidce being 

 Cydophorus foliacens from the Andamans. The presence of a 

 species of Codilostyla (C. viridis) is curious. There are also 2 

 species of JVa?ii?ia that have been referred to Xesta. 3 very large 

 species of Adiatina and 6 of Ennea exist, a proof of the affinity 

 of the fauna to that of the mainland of Tropical Africa. 



5. THE MASCARENES AND SEYCHELLES. The fauna of these 

 islands is not, as might have been thought likely, a mere offshoot 

 of that of Madagascar, but on the cbntrary, almost as distinct 

 from the Malagasian fauna as the latter is from that of the main- 

 land. Though all the islands have peculiar species, some features 

 are common to them all ; the abundance of Gonospira, a genus 

 forrrerly confounded with Pupa, but now found to be carnivorous, 

 and placed near, or even joined to E/utea, the existence oi Na?iina 

 in tolerable numbers, and the rarity of true Helices. All have 

 been well explored. An excellent account of the mollusca, both 

 terrestrial and marine, of Reunion has been pubUshed by 



