36 MONOGRAPH OF BRITISH LAND AND FRESHWATER MOLLUSCA. 
Hygromia revelata (Michaud). 
1831 Helix (Helicella) revelata Michaud, Compl., p. 27, pl. 15, ff. 6-8. 
1839 — _  subvirescens Bellamy, Nat. Hist. South Devon, p. 418, pl. 18. 
1840 — (Hygromanes) revelata Gray’s Turton’s Manual, p. 142, pl. 11, f. 133. 
1841 — subviridis Bellamy, British Association Report. 
1855 — _ occidentalis Moq.-Tand., Hist. Moll., p. 221, & pl. 17, f. 10-13, not Reeluz. 
1889 — (Zenobia) revelata Paetel, Catal., p. 177. 
1890 — (Trichia) revelata Westerlund, Catal. Reg. Palearct., p. 23. 
1906 — (Capillifera) revelata Honigmann, Beitr. zur Moll., p. 190. 
1837 Helicella revelata Beck, Index Moll., p. 7. 
1858 Hygromia revelata H. and A. Adams, Gen. of Moll., p. 215. 
1860 Fruticicola (Eulota) occidentalis von Martens, Albers, Heliceen, p. 103. 
ISTORY.— Hygromia revelata (reveluta, dis- 
covered) was first noticed with certainty by 
Lieut. André Louis Gaspard Michaud, who in 
his Supplement to the work of Draparnaud 
described and figured the species, which is here 
associated with its distinguished author. 
The Helix revelata previously mentioned by 
Férussac, was apparently neither described nor 
figured and according to Dr. Gwyn Jeffreys was 
based upon specimens of Helia granulata from 
Angersand Paris; while Mabille was of opinion 
that Férussac’s Helix revelata was probably a 
young Helix incarnata or H. strigella, but M. 
Michaud was a contemporary of Baron Férussac, 
and believed the species of Férussac to be iden- 
tical with his own. 
Moquin-T'andon regarded his Helix occtdent- 
alis to be that of Recluz and conequently the 
same as H. ponentina of Morelet, as Recluz 
never described his species, the name being 
simply one he suggested to supersede that of 
ponentina, on the ground that Morelet’s name 
did not conform to the accepted rules of 
nomenclature. Moquin-T'andon also believed 
his species to be identical with Helix revelata 
Michaud, but he regarded the H. revelata of Férussac and Bourguignat as 
distinct therefrom. 
Dr. L. Germain on the contrary considers the Helix revelata of Férussac 
and Bourguignat as quite identical with H. occidentalis of Moquin-Tandon 
but as specifically different from both the true occidentalis Recluz, and the 
Helix revelata Michaud, referring the latter species to 1. montivaga Westld. 
a globose shell with a white peripheral zone bordered on each side with 
brown. Dr. Germain and other French authors do not, however, appear to 
be well acquainted with H.montivaga, as they ascribe that name to a different 
form which may well be the Helix revelata as usually understood. 
Abbé Dupuy who examined many Portuguese specimens of //. ponentina 
received from M. Morelet, is emphatic that they are identical with French 
specimens of Helix occidentalis and M. Morelet himself had not the least 
doubt that his Helix ponentina was quite the same as Helix revelata Fer. 
