278 MELANIIDJ], 



Sub-Genus TIABA, Bolten. 



E. and A. Adams, Gen. Moll. 1, 1855, as distinct Genus ; type restr. Brot, 

 Mel. amarula. 



85. Melania [Tiara] amarula. 



Helix amarula, Linnceus, Syst. Nat. XII, p. 1249, 1767, " Hal. in Asice 

 fluviis " ; Brugidere, Enc. Meth., pi. 458, fig. 6 ; fide Mcerch should he 

 " Mel. melanus (Melas), Mtf., ''from Mauritius, Sfc. ; juv. = M. moreleti, 

 Desh. {not Reeve^, Traite Elem. Conch,., Hah. ? and of Brot, pi. 30, 

 fig. 2-2A. ; juv. ?=Brot, l. c, pi. 28, fig. 5, B. and C. las M. pagoda, 

 var.']. 



1 Locality ? j ex c. G. Nevill, Esq. [20^, 11]. 



Unfortunately, I have no record concerning this specimen, 

 •well represented by M. Brot's pi. 30, fig. 2 [M. moreleti] ; 

 the body whorl is smoother and less ventricose, spire more 

 exserted than in young Mauritian specimens. 



5 " Trou d'Eau Douce," Mauritius ; coll. G. Nevill, Esq. 



A very fine form, near M. Brot's pi. 29, fig. lA. 



5 Mauritius ; coll. G. Nevill, Esq. 



The typical form well represented by M. Brot's, pi. 29, fig. 1. 

 Despite M. Brot's valued opinion [1. c, p. 291], I think I may 

 state positively that Deshayes' M. moreleti is the young of the 

 typical form, notwithstanding the remarkable " quasi " adult 

 appearance that it invariably presents. These young specimens 

 agree well with pi. 30, fig. 2 A, 1. c. Dr. IMoerch considered a 

 form from the IVEoluccas as the true Mel. amarula. 



subvar. depauperata. 



Conc7i.'Cah. II, pi. 29, fig, IF, Madagascar. 



1 Nossi-be, Madagascar ; coll. J. Caldwell, Esq. 



Long. 33, diam. 17| mil. Apparently a locally constant 

 race. 



subvar. COmuta. 



Mel. cornuta, Lea, P. Zool. S. Madagascar. 



1 Madagascar; coll. J. Caldwell, Esq. [conf. Conch.-Cab. II, pi. 29, 

 fig. lA.]. 



