HELIX. 391 
although he has referred in his synonymy to almost all the 
extant engravings of members of that genus. These, for the 
most part, are almost too rude to admit of incontestable recog- 
nition, but have been assigned by Récluz to the following 
members of the genus: S. maculatus (Argenville and Petiver), 
S. planulatus (Gualt. lower F.), S. Haliotideus, young (Gualt. 
upper F.), S. Listert (Lister), S. zonalis (Rumphius and Klein), 
S. cymba (Bonanni), S. concavus of Lamarck (Adanson). Of 
these seven species the expression “ depresso-planiuscula” ex- 
cludes the last four ; ‘‘ lactea,” strictly interpreted, the first ; and 
“striis undatis” the second: as to the third, the drawing is so 
uncharacteristic that it has been subsequently quoted by the 
same writer for his S. Antillarum. 
The types appear to be identical with the Sig. Haliotoideus 
of Récluz’s Monograph (in Chenu’s ‘ Illustrations Conchylio- 
logiques’); but none of the figures in that costly publication 
precisely display their characteristic features. In general aspect 
they resemble the S. Leachw of Sowerby, but are remarkably 
planulate, and have a larger portion of their surface occupied 
by the spire. The species, though alleged to be a native of the 
Mediterranean, is, I believe, a tropical one: it is rare, but is 
present in the Cumingian collection. 
Helix anrbtgua, 
The correctness of Philippi’s surmise, that the Fossarus 
Adansoniui was the Helix ambigua of Linneus, is confirmed by 
the presence of that shell (Enum. Moll. Sicil. vol. ii. pl. 25, f. 1) 
in the cabinet of our author, where alone of the specimens 
therein contained it answers adequately to the requirements of 
the definition. 
