LABYRINTHUS. 177 
Nearly allied to the preceding, but differs in the presence of two basal plaits, the 
distinct angle in the periphery of the shell, and the more elevated spire. 
I give a full description from a specimen sent by H. Pittier, and have no doubt 
that it belongs to Broderip’s species; Reeve’s figure+ corresponds exactly. In some 
collections the Venezuelan L. tamsianus (Dunker) or L. leucodon (Pfr.) is labelled 
L. quadridentatus. 
Pfeiffer 23 and Reeve 4 merely quote Central America as the locality ; but Broderip ! 
gives Golfo Dulce, on the Pacific coast. 
8. Labyrinthus uncigerus. 
Carocolla uncigera, Petit, in Guérin’s Mag. Zool. 1838, t. 113°. 
Helix uncigera (Petit), Pfr. Monogr. Helic. Vivent. i. p. 398? ; in Martini & Chemnitz, Syst. Conch.- 
Cab. ed. 2, Heliz, ii. p. 206. no. 663, t. 104. figg. 8-10°; Deshayes, in Férussac’s Hist. Nat. 
Moll. Terr. et Fluv. i. p. 385 +. 
Hab. Istumus or Panama 1-4. 
Easily recognizable by the curious hooked tooth within the aperture, which corre- 
sponds to the exterior basal one of ZL. quadridentatus, but is somewhat more within 
the aperture and does not reach the margin. 
4. Labyrinthus annuliferus. 
Helix labyrinthus, var. sipunculata, Forbes, P. Z. 8S. 1850, p. 53, t. 9. figg. 4a, 45°. 
Helix annulifera, Pfr. P. Z. 8.1851, p. 200’, and Monogr. Helic. Vivent. iii. p. 255°; Reeve, Conch. 
Icon. vii., Heli#, t. 100. fig. 555 *. 
Hab. Panama?? (Kellett and Wood 1). 
A variety of larger size, with thicker peristome, viz. H. erecta, Mduss., occurs more 
to the south in Colombia. 
; 5. Labyrinthus plicatus. 
-——, Seba, Thesaurus, ii. p. 123, t. 40. figg. 24, 25 (1761) *. 
Helix plicata, Born, Index Test. Mus. Ces. 1778, p. 376%, and Test. Mus. Ces. 1780, p. 368°; 
Tate, Am. Journ. Conch. v. p. 156 (1866)* ; Brauer, Sitzungs-Ber. Akad. Wien, Ixxvii. p. 180 
(1878) °. 
Helix labyrinthus (Chemn.) (part.), Férussac, Hist. Nat. Moll. Terr. et Fluv. t. 154.8. fig. 5°; Pfr. 
Monogr. Helic. Vivent. i. p. 398"; Reeve, Conch. Icon. vii., Helix, t. 100. fig. 550° 
Hab, N. Panama: north shore of Naval Bay, Colon, in a forest (Tate +). 
It is not quite certain whether Tate’s shell* belongs to L. plicatus, as there are 
some nearly allied species, or perhaps rather varieties, in Colombia and Venezuela 
which have often been confounded with it—as, for instance, L. hydeanus (Lea) and 
L. subplanatus (Petit). 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, May 1893. 93 
