MOLLUSCA. 597 
Var. pittieri, n. 
Distinctly flatter than the typical form, less vaulted, 29 millim. only in diameter, 164 in height; aperture 
12 millim. 
Hab. N.W. Costa Rica: Bay of Salinas (Pittier, July 1890). 
Cyclotus (Aperostoma) bisinuatus (p. 3). 
To the localities given, add :— 
S.W. Costa Rica: Terraba (Pittier). 
Cyclotus (Aperostoma) dysoni (p. 3). 
Aperostoma dysoni, Ancey, Ann. de Malac. ii. p. 250 (1886) ™. 
Cyclotus dysoni, Pilsbry, Proc. Acad. Phil. 1891, p. 325°, and 1892, p. 388"; Biolley, Mol. terr. 
y fluv. de Costa Rica, p. 4°”. 
To the localities given, add :— 
Hab. |S.E. Mexico:| Mountains of Poana, Tabasco (Rovirosa 1°), 
[Yucatan :] Silam, Shkolak, Tekanto, Labna, Tunkas, Ticul, Stilpech, and Tapi; 
‘one of the most abundant land-shells of northern Yucatan ” (Heilprin"). 
EK. Guatemata (£7. v. Lhering). 
[Honpuras:] Copan (#. v. Ihering); Eastern Coast (Simpson 14). 
[Cenrrat -NicaraGcua :] Managua (Rothschuh). 
E. Costa Rica: Turrialba, 750 metres (Biolley !"); Valley of Tuis (Pittier). 
[N.W. Costa Rica:] Bay of Salinas (Pittier). 
S.W. Costa Rica: Surubres, near San Mateo, 250 metres (Biolley 1"); Terraba, 
200-300 metres (Pittier); Alto de Mano Tigre, 690-700 metres (Pittier). 
Var. multilineatus. 
Cyclotus dysoni, var. multilineatus, Pilsbry, Proc. Acad. Phil. 1891, p. 325°. 
Varied by numerous dark spiral lines and bands. 
Hab. Yucatan: Tabi and Ticul (Hetlprin '). 
Cyclotus(?) boucardi (p. 5). 
To the localities given, add :— : 
Hab. [E. Costa Rica:] Moin near Limon, along the coast at the foot of the cliffs 
(falaises), in thickets of Bromeliaceous plants (Pittier, July 1898). 
CYCLOPHORUS (p. 5). 
Cyclophorus (Amphicyclotus) ponderosus (p. 6). 
To the localities given, add :— 
[N. GuaTEMALA :] San Juan in Vera Paz (Champion: a specimen 42 millim. in 
diameter). 
