GUPPYA. 121 
5. Guppya pittieri, sp.n. (Tab. VI. figg. 18, 18 ad.) 
Testa anguste perforata, rotundato-conica, angustispira, tenuis, nitida, levissime striatula, eorneo-fulva; 
anfractus 54, convexiusculi, ultimus ad peripheriam obtuse angulatus, basi modice convexus; apertura. 
lunato-rotundata, peristomate simplice. 
Diam. maj. 3, alt. 24 millim. 
Hab. Centrau Costa Rica: San Francisco de los Rios, near San José, 1100 metres: 
above the sea, in the hedges surrounding the coffee-plantations (Pittier); La 
Urraca, near San José, at 1135 metres above the sea, in moss (Biolley). 
This species bears about the same relationship to G. biolleyi as (. elegans does to 
G. trochulina (selenkai), differing chiefly by the narrower and more gradually increasing 
whorls, the last of which occupies a smaller part of the whole height. Under the 
microscope, with a magnifying-power of §°, very faint and very close spiral striz are 
to be detected under favourable light, chiefly at the base of the shell. 
Named in honour of H. Pittier, of the National Physico-geographical Institute of 
San José de Costa Rica, who has sent me valuable shells collected by himself during 
his explorations in that country in 1891. 
6. Guppya biolleyi, sp. n. (Tab. VI. figg. 19, 19 a-d.) 
Testa anguste perforata, conoideo-globosa, tenuis, nitida, leviter striatula; anfractus 5, convexiusculi, ultimus 
ad peripheriam obtuse angulatus, basi convexus ; apertura lunato-rotundata, peristomate simplice, margine 
basali arcuato, 
Diam. maj. 23, min. 24, alt. 2 millim. 
Hab. W. Guatemata: Hacienda Helvetia, in the Costa Cuca, Pacific slope (Stol/). 
CentraL Costa Rica: La Urraca, near San José, 1100 to 1135 metres above the sea,. 
on trunks and among moss (Biolley); San Francisco de los Rios (fH. Pittier). 
This species comes near the preceding (G. pittieri), but is more globose, somewhat 
like G. gundlacht. By examination under a magnifying-power of °° only very faint, 
scattered, indistinct spiral striz are visible on the surface of the shell, the strie being 
somewhat more distinct on the underside. 
Named in honour of P. Biolley, who has sent several interesting land and freshwater 
shells from Costa Rica to the Museum in Neuchatel, Switzerland. 
7. Guppya micans. 
Stenopus micans, Angas, P. Z. 8. 1879, p. 485, t. 40. fig. 15°. 
Hab. Costa Rica (abd +). 
The figure given by Angas does not correspond with the description: in the figure 
the periphery of the shell is quite rounded, and there is a dark line which is intended 
perhaps to mark a subangulation, somewhat above the periphery of the last whorl, but 
no trace of it is to be seen near the aperture; in the description the periphery is said 
BIOL. CENTR.-AMER., Terr. and Fluviat. Mollusca, March 1892. 16 
