120 MOLLUSCA. 
2. Guppya trochulina.: (Tab. VI. figg. 17, 17 ad.) 
Helix trochulina, Morelet, Test. Noviss. ii. p. 10 (1851)*; Pfr. Monogr. Helic. Viv. iii. p. 40°. 
Zonites (Habroconus) trochulinus (Morel.), Fisch. & Crosse, Miss. Scient. Mex., Mollusca, 1. p. 172°. 
Habroconus trochulinus (Morel.), Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 24°. 
Zonites selenkai, Pfr. in Malak. Blatt. xii. p. 77 (1866)*°; Monogr. Helic. Vivent. v. p.58°; Semper, 
Reisen im Archipel der Philipp., Landmoll. i. p. 80, t. 5. fig. 25 (radula)’. 
Zonites (Habroconus) selenkei (Pfr.), Fisch. & Crosse, loc. cit. p. 171, t. 7. figg. 9, 9a, 5°. 
Habroconus selenkai (Pfr.), Strebel, loc. cit. p. 23, t. 4. figg. 1, 1 @ (shell), t. 9. fig. 9 (radula) °. 
Hab. E. Mexico: Agua Caliente near Misantla, and plantation Mirador near Jalapa, 
in ravines (barrancas), on shrubs (Berendt & Strebel >) ; Jalapa (Hoge). 
N. GUATEMALA: woods of Peten, near San Luis (Morelet }~*). : 
CentraL Costa Rica: environs of San José, near the streamlet Atajueleta, 1135 
metres above the sea, among moss (volley). 
Morelet’s species has not been recognized by Pfeiffer and later authors, because in 
his description ! it is termed ‘“‘imperforata.” But an examination of the only specimen 
which still exists in his collection has satisfied me that there is a very minute perforation 
at the centre of its base, visible only by close inspection under favourable light; and 
as I can find no other tenable difference, I feel bound to treat G. trochulina and 
G. selenkai as belonging to one and the same species. 
Under a magnifying-power of §° irregular spiral strize are to be seen on the surface 
of the shell, not close together, but with large intervals. 
The figure here given is drawn from Morelet’s specimen. 
3. Guppya angasi. 
Stenopus guildingi, Angas, P. Z. 8S. 1879, p. 484, t. 40. fig. 14 (nec Bland)’. 
Hab. Costa Rica (Gabo). 
Appears to be distinct from all others of the genus by the “ strongly defined thread- 
like” carina. The specific name given by Angas cannot stand, as there is already a 
Stenopus (or Guppya) guildingi, from Venezuela, named by Th. Bland in 1865. 
4, Guppya elegans, 
Habroconus elegans, Strebel, Beitr. Mex. Land- und Siissw.-Conch. iv. p. 24, t. 4. figg. 15, Le’. 
Stenopus elegans, Pilsbry, Proc. Acad. Phil. 1891, p. 3127. 
Hab. E. Mexico: wood of Pacho, near Jalapa (Dofia Estefania1); Orizaba, about 
500 feet above the town (Heilprin ?). 
CentraL Mexico: Yautepec, Morelos (Heilprin ?), 
CrentraL GuaTEMALA: Salama (coll. Morelet). 
