294 Rev. R. T. Lowe on Melampus, bic. 



3 ? Auricula J^ucleus, F^russ., Tabl. Syst. p. 105, No, 26. 



" Helix Nucleus, Gmel., Syst. Nat. p. 3651." 



Martyn, Univers. Coach, torn. II., tab. 68, fig. exter. 



a) Knorr, Vergn. torn. VI., tab. 17, f. 9. 



Hab. Otaiti, Martyn. 



" On ne connoit point les animaux des deux especes de ce groupe, qui 

 ont une forme si remarquable. Tout porte cependant a croire qu'elles 

 sent du meme genre que celles des groupes precedents." F^russ. 1. c. 



It is very possible that several species associated with Tornatella, from 

 vsrhich, however, they are distinguished by the thickness and solidity of 

 their shells, together with a certain smoothness of surface, uniformity 

 of colour, and habit, may hereafter be found to rank under the present 

 genus, e. g. Tornatella nitidula, Lam. 



Auricula Dombeiana, Lam., and Voluta fluviatilis dxvA jluminea, 

 Maton, with other truly fluviatile species, will probably be found, when 

 their animals are known, either to form a genus of themselves, as sug- 

 gested by Sowerby, or at least not to unite generically with the Melam- 

 podes. 



It only remains to point out how Melampus is distinguished from the 

 several genera with which it is most likely to be confounded. It differs 

 from Auricula (taking A%r. Midcs, Juda, &c. as typical species of that 

 genus,) in being one of the Marine Pectinibranchia ; while in respect to 

 those species just mentioned, the evidence at least preponderates in favour 

 of their belonging to the Land Pulmonea. Should they also be found here- 

 after to have /our tentacula, it is possible they may be imited to the He- 

 lices, as F^russac has already done with Auricula Sileni, auris leporis, 

 bovina, and caprella of Lamarck ; in which case the genus Auricula will 

 be left without a single representative, Aur. minima having been 

 long ago by Miiller called Carychium, and Aur. Scarabaus, Lam., having 

 also been separated by Fdrussac, under the name oi Scarabus, and hav- 

 ing, like Carychium, only two tentacula. If they prove to have two 

 tentacula, and be really at the same time terrestrial Pulmonea, which is 

 perhaps the most probable supposition, the genus Scarafews of F^russac 

 may perhaps merge into one with them ; for which the name Auricula 

 should unquestionably be preserved. And in either case, the name Au- 



