HELIX, 133 
Russia (662° N, lat.) to Sicily, Algeria, and Syria; also in Siberia and Tibet; introduced 
in Madeira®; within North America from Canada ! 45 to Florida !!, Idaho 15, Colorado ©, 
New Mexico 15, and Arizona ». 
Subgen. TRICHODISCINA. 
Trichodiscus, Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 32 (1880) (preoccupied in the 
Infusoria by Ehrenberg). 
Shell of moderate size, finely granulate and hairy, more or less flat above, umbili- 
cated; peristome slightly reflexed above, more distinctly beneath. Jaw with strong 
ribs. : 
The anatomy of this subgenus is only imperfectly known: see Strebel, loc. ezt. p. 33. 
For Table of Species, see page 134. 
7. Helix coactiliata. | | 
Helix coactiliata, Deshayes, in Férussac’s Hist. Nat. Moll. terr. i. p. 18, t. 72. figg. 1-5 (before 
1838) '; Pfr. Monogr. Helic. Vivent. i. p. 200°, and in Martini & Chemnitz, Syst. Conch.- 
Cab. ed. 2, Heliz, ii. p. 165. no. 610, t. 95. figg. 23-25 (not adult)*; Reeve, Conch. Icon. 
vii., Helix, t. 107. fig. 595°; Tristram, P.Z.S. 1861, p. 230°; Guppy, P.Z.S8. 1875, 
p- 318 °. 
Heliz (Patula) coactiliata (Fér.), Fisch. & Crosse, Miss. Scient. Mex., Mollusca, i. p, 234 (excl. 
var.) ". ; | 
Trichodiscus coactiiiatus (Fér.), Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 34°. 
Patula coactiliata (Fér.), Pilsbry, Proc. Acad. Phil. 1891, p. 314°. 
Helix teniata, Nyst, in litt.*. 
Heliz nystiana, Pfr. P. Z. 8. 1845, p. 1380". 
Helix bridgesi, Tryon, Am. Journ. Conch. ii. p. 303, t. 20. figg. 9, 10 (1866) (nee Newcomb) ”. 
Heliz parkeri, Tryon, loc. cit. 11. p. 106”; Pfr. Monogr. Helic. Vivent. vii. p. 175 ™. 
Hab. S.E. Mexico: Tabasco (Nyst ? 3). 
Yucatan: Tunkas and Labna (/eilprin °). 
British Honduras: Belize (Bocourt*). 
N. Guatemaua (Salvin °). 
EK. GuaTeMALa: near Livingston, Bay of Honduras (0. Séo//). 
W. Nicaragua: Realejo (coll. Cuming 22"); Nicaragua (Bridges ~"4). 
According to 'Tate and Guppy °*, ZZ. coactiliata is also found in Venezuela and 
Trinidad. | 
The flattest species in this subgenus ; usually five bands are present, the uppermost 
near the suture (sometimes wanting), a second and third also on the upper side of the 
* Guppy’s statement that this species also occurs in Peru is apparently a mistake, caused probably by 
Deshayes referring the locality—Tuspan—of his H. coactiliata, var. 3 (our H. cordovana), to Peru instead of 
Mexico. 
