626 SUPPLEMENT. 
S.W. Costa Rica: Alto de Sapote, between Bacé and El General, 1200 metres 
(Pitter, Jan. 1898). 
Helix costaricensis (p. 158). 
Helix costaricensis, Biolley, Mol. terr. y fluv. de Costa Rica, p. 117. 
To the localities given, add :— 
Hab. N.E. Costa Rica: Puente de Tierra, on the road to the Rio Sarapiqui (Biolley*). 
E. Costa Rica: Caché (Rogers); Santa Clara, 250 metres (Biolley7); between Mokri 
and Ukatschka, and between Uiskar and Mokri, Alta Talamanca (Pitter, 
Sept. 1898); Valley of Tuis (Pittver, 1893). 
The largest specimen sent by Biolley measures 32 millim. in the greatest and 25 in 
the least diameter, and 15 millim. in height. 
Subgen. SoLaropsis (p. 159). 
The anatomy of this subgenus or genus being unknown to Pilsbry, he could not give 
it a definite place in his classification. But my friend Fr. Wiegmann has since examined 
a specimen of the Brazilian H. (Solaropsis) heliaca, d’Orb., and comes to the conclusion 
that it belongs to the tribe “‘ Epiphallophora”: see Fr. Wiegmann, Nachrichtsblatt 
der deutsch. malak. Ges. 1900, p. 178. 
Helix tiloriensis (p. 159). 
To the locality given, add:— 
Hab. N.E. Costa Rica: Puerto Viejo, at the confluence of the Rio Viejo and the Rio 
Sarapiqui, on leaves (Biolley). 
Helix sigmoides (p. 160). 
Pilsbry places this species in the genus Thysanophora (see above, p. 621) [* Manual 
of Conchology,’ (2) ix. p. 57]. 
Helix tenuicostata (p. 161). 
According to Pilsbry, in Tryon’s ‘ Manual of Conchology,’ (2) ix. p. 184, this doubtful 
species is synonymous with H. troscheli, Pfr., section Hemitrochus, from Cuba. But 
the late Dr. Pfeiffer, who had specimens of both in his own collection, treats the two 
as distinct, and places them widely apart in his last work (Monogr. Helic. Vivent. vii. 
pp. 273, 400). 
POLYGYRA (p. 162). 
This genus belongs to the tribe “ Protogona” of Helicide: see Pilsbry, in Tryon’s 
‘Manual of Conchology,’ (2) ix. p. xxxiii. 
