604 SUPPLEMENT. 
N.E. Costa Rica: San Miguel, valley of the Sarapiqui, 200 metres; Puerto Viejo 
(Biolley ®); on the borders of the Rio San Juan (Pittier). 
[E. Costa Rica :] Tuis, 600 metres (Biolley °, Pittier); Turrialba, 750 metres (Biolley). 
Centrat Costa Rica: Azahar de Cartago and Tarbaca, 1500-1600 metres, only the 
smaller varieties (Biolley). | 
S.W. Costa Rica: Bay of Terraba, Tocori in the valley of the Rio Paquita, middle 
part of the Rio Saveque and lower part of the Rio Pacuare ( Prétzer) ; El Pital, in 
the valley of the Rio Naranjo, some specimens banded and others more elevated 
(Pittier). 
N. Panama: Monkey Hill, near Colon (Adllaud 1°). 
Biolley says that this is the commonest species of the genus in Costa Rica, found 
on the trunks of trees, the stems of plantains (J/usa), and also on the ground. 
Helicina chrysocheila (p. 33). 
Helicina chrysochila, Fischer & Crosse, Miss. Scient. Mex., Moll. ui. p. 414°. 
Var. shuttleworthi. 
Helicina shuttleworthi, Fischer & Crosse, loc. cit. p. 415°. 
No additional localities are mentioned for this species. 
Helicina tenuis (p. 34). 
Helicina lindeni, Ancey, Ann. de Malac. ii. p. 258 (1886) *; Fischer & Crosse, Miss. Scient. Mex., 
Moll. ii. p. 416, t. 56. figg. 1, 1 a,b, 2, 24,6, 3, 3a, 6b”. 
Helicina tenuis, var. chiapensis, Pilsbry, Proce. Acad. Phil. 1&92, p. 889”. 
Helicina tenuis, Biolley, Mol. terr. y fluv. de Costa Rica, p. 5”. 
To the localities given, add :— 
Hab. |S.E. Mexico:] Poana, Tabasco (Rovirosa 5). 
Honpuras: East Coast, specimens of smaller size, 9 millim. in diameter, 74+ high 
(Simpson 24). 
N.E. Costa Rica: La Paz, on the road to the Rio Sarapiqui (Biolley 2”), 
Centra Costa Rica: Alajuela, 900-1000 metres (Orosco). 
S.W. Costa Rica: Turubares, 200 metres (Biolley?’); along the Rio de los Platanales 
and the Golfo Dulce (Pittier). 
Of the two specific names given to this species by Dr. Pfeiffer 216 in the same part 
of the ‘ Proceedings of the Zoological Society’ for 1848, Fischer and Crosse prefer 
indent, because it appears one page earlier; I have used tenuis, as the most 
applicable. Pfeiffer himself separated them in his last publication [ Monogr. Pneum. 
Vivent. iv. pp. 268, 276 (1876) | by seventy-cight species, referring the one to the group 
without keel and the other to the “ Subcarinate.” 
