389 



DEFINITIONS OP FURTHER NEW GENERA OP ZONITID^. 



By G. K. GuDE, F.Z.S. 



Read 13th June, 1913. 



On two previous occasions I have published iu these Proceedings 

 some notes on preoccupied generic names in the Zonitidte. My 

 further work in classifying this division of Gastropods has l)rought 

 to lightsome instances of genera containing more or less heterogeneous 

 assemblages of species, and it has been thought expedient meanwhile 

 to revise these groups. 



The first case is that of Trochonanina, a genus established by 

 Mousson ' for a somewliat numerous group which he considered should 

 be separated from Trochomorpha , and which should include, besides 

 the new species — Trochonanina Schneltziana — he was describing at the 

 time, cotius, Phil., rectangula and insculpta, Pfr., argentea^ E,ve., 

 Calaharica, Laluane^isis, and Mozambicensis, Pfr., conicoides, Mete, 

 lychnia, Bens., etc. This incongruous assemblage of species from 

 widely separated regions, i.e. East and West Africa, the Mascarenes, 

 the Malay Archipelago, and Oceania, it is impossible, according to our 

 present views of generic limits, to retain in one genus, and several of 

 them have, in fact, already been assigned to other genera. Thus 

 argentea, Rve., has been classed in Rotiila by Nevill,^ imculpta of 

 Pfeiffer has been referred to Medyla by Suter.^ The type of Medyla 

 being Vitrina viridis, Q,uoy, from the Philippine Islands, imculpta 

 will re(}uire to be placed in another genus, but Mr. Iredale is dealing 

 with this question, and I merely allude to this en passant. 



Calaharica, Pfr., was classed by Bourguignat in Moaria,^ while 

 finally Mozamhice7isis, Pfr., was made the type of the genus Martensia 

 by Semper.* Mollendorff, in creating the genus Coneuplecta'^ for 

 the reception of scalarina (type), confusa, Molldff., rotundata and 

 turrita, Semp., proposed to include To7igana, Quoy, and Schmeltziana, 

 Mouss. He referred to the fact that Pfeffer '' had restricted Trochonanina 

 to radians, Pfr., and Schmeltziana, ^louss., and that Coneuplecta was 

 consequently synonymous with Trochonanina, as understood by Pfeiffer. 

 For that reason he thought it advisable to suppress Mousson's name 

 and to give a new name to the group of conicoides, but did not do so. 

 I do not, however, consider that the Philippine species referred to are 

 congeneric with the Pacific forms, and while it is perfectly true that 

 Mousson did not specify a type, the fact that he had before him 

 and was describing T. Schmeltziana is sufficient to enable us to fix 

 that species as the type of Troehonanina, as was pointed out by 



1 Journ. de Conch., vol. xvii, p. 330, 1869. 



^ Hand List Moll. Indian Museum, vol. i, p. 43, 1878. 



* Proc. Malac. Soc Lond., vol. iii, p. 330, 1899. 

 ^ Moll. Afrique Equat., 1899, p. 14. 



* Reisen Arch. Philippinen, vol. iii, p. 42, 1870. 

 ^ Ber. Senckenb. Ges., 1893, p. 64. 



■^ Abb. Ges. Naturw. Hambmg-Altona, vol. vii, pt. ii, p. '2'2, 1883. 



