Mascarene Land-Mollusca. 427 



Among South Indian and Ceylon shells which I have 

 examined there is nothing at all approaching the form of 

 the generative organs of E. leucostyla and E. rufozonata ; 

 thus tliey form a well-iuarked genus of the Zonitidae in 

 this part of the world, and, when we know more of the 

 species of this family in Africa, may possess subfamily rank. 

 I may further point out that Semper gives a figure of the 

 spermatophore of E. [Rotula) rufa (pi. iii. figs. 2J<, a, b) : this 

 shows a very well-marked form, which I hope to find in 

 some of the preserved specimens sent home by Monsieur E. 

 Dupont, to whom I must again tender my thanks for the 

 assistance he has given me. 



Subgenus Ccelatura, Pfeiff'er. 



Erepta (Coelatura) ccelatura, Fer. (PI. IX. figs. D, D.) 



Rotula ccelatura, Semper, Reis. iua Arcliipel d. Pliilippinen, p. 39, 



pi. iii. fig's. 22 a, b, pi. vii. fig. 1. 

 Nanina {Rhysota) ccelatura,, Fer. Nev. Hand-list, i. p. 40 (1878), 



Locality. Brule, St. Denis, Bourbon {E. Dupont). 



Animal. The left dorsal lobe is in three separate lappets. 



The buccal mass is very globose in form. 



The generative organs agree exactly with Semper's figure 

 on plate iii.; the flagelkim is not so thin and lengthened as in 

 E. leucostyla and E. rufozonata. 



The radula has the formula 



82 . 2 . 22 . 1 . 22 . 2 . 82, or 106 . 1 . 106 



The jaw : cutting-edge slightly concave with slight central 

 projection. 



Erepta [Cvelatura] rufa, Less. (PI. IX. fig. C.) 



Rotula rufa, Semper, Reis. im Archip. d. Philippineu, p. 39, pi. iii. 



figs. 23, a, b, 24, a, b ; pi. vii. fig. 3. 

 Nanina [MacrochUiniys ou Rotula ?) semifusca, Desliayes. 

 Helix semifusca, Desli. Voy. Ind. pi. i. figs. 8-10. 

 Helix rufa auctorum (non Lesson), 



Mr. Geoffrey Nevill, in 'Journ. Conchyliologie,^ x.xvi, 

 1878, p. 59, shows that semifusca is from the Mauritius, not 

 from Pondichery. 



Locality. Mauritius {E. Dupont). 



The example in the British Museum of H. rtcfa, Lesson, 

 Mauritius (Voyage ' Rattlesnake,' 1847), is the same as a 

 shell sent to me by Mr. Ponsonby. There is a single speci- 

 men of H. scalpta from Sir David Barclay, Isle of France ; it 

 is named on the original label H. rufa, and has the same 



30* 



