their Recent Paper " On Helicella, FSrussac." G25 



" Siibgeims CapiUifera, Hoiiigmann, 1906 " (p. 179) tliore 

 liad been included (p, 180) " Section 4: Perforatella, Scliluter, 

 18158." The latter will, therefore, become the name tor the 

 subgenus, CapiUifera being reserved, as before, for section 1. 

 Similarly, the " Subgenus Jocos/a, Gray, 1821 " (p. 183) and 

 " Genus Ilelieopsis, Fitziiiger, 1833 " (p. 181) must exchange 

 rank. 



Monachella, proposed by us (p. 179) in lieu of AJotiacha, 

 proves to be preoccu[)ied for Aves (Salvadori, Ann. Mns. Civ. 

 Genova, vi. 1874, p. 82). We now propose to substitute for 

 it Monacho'ides. 



Trochoidea, Brown, 1827, was referred to by us in a note 

 (p. 183), when pointing out that it had been improperly 

 employed for Helix elegans, Gmelin, under the erroneous 

 belief tiiat that species was a synonym for the Trochus 

 terrestris of Pennant. The latter, however, was undoubtedly,^ 

 the same species as the Helix falcn of Miiller. It has, there- 

 fore, been suggested to us that Brown^s I'rochoidea sliould 

 have appeared in the synonjnny under Petasina, Beck, 1817 

 (p. 177). We think it should not, as will become apparent 

 from the following succinct history of the name : — 



Pennant, in 1777 (Brit. Zool. iv. 8vo ed. p. 127, fig. 108), 

 described and figured under the name of Trochus terrestris a 

 shell that was undoubtedly i\\elJelixfulva of Miiller. Da Costa, 

 1778 (Hist. Nat. Test. Brit. p. 35), described but did not 

 figure a " Trochus terrestris, Listeri," whicli is also obviously 

 the II. fulva, MiiW. Lister, of course, gave no such name, 

 but his ^' Buccinum parvum, sive trochilus sylvaticus," &c., 

 is evidently the same thing. Montagu, in 1803, introduced 

 confusion iiro the case. On the one hand (Test. Brit. p. 287), 

 he gave Trochus terrestris, citing Pennant as above and also 

 Lister's (iiibt. Conch.) t. Gl. fig. 58, which is clearly the 

 H. elegans of Gmelin. On the other hand {op. cit. p. 427, 

 pi. xi. fig. 9), he created Helix trochiformis, under which he 

 cited Da Costa's " Irochus terrestris, Listeri," and reference 

 to Lister's "Hist. Anim. Angl.," adding Helix trochulus, 

 Miiller, which, howevei-, is now held to be tiie young form of 

 Hna obscura. Brown, in 1827, followed in Mont;igu's foot- 

 steps, f ( r he has (Illust. Conch. Gt. Brit. pi. xl. fig. 2) the 

 Helix trocJrtformis, Mont., which is manifestly M filler's /w/va, 

 and also his own Trochoidea terrestre (op. at. pi. xli. figs. 80 

 (fe 81), cited as of Montagu (not as of fennant direct), whilst 

 his accompanying figures are evidently inventions, for they 

 were not taken either trom Pennant or from Lister's "Hist. 

 Conch.," nor do they resemble either fulva or elegans. In 

 the second edition of his work Brown (p. 46, pi. xvii. fig. 2) 



