102 ' ' GASTROCOPTA, SOUTH AMERICA. 



from a more elevated region, rather different faunally. Pend- 

 ing a direct comparison, both may be allowed to stand. 



36. GASTROCOPTA PAZI (Hidalgo). PL 17, fig. 13. 



The shell is rimate-subperforate, ovate-cylindric, thin, very 

 lightly striatulate, corneous; spire with the apex obtuse; 

 suture deep ; whorls 5 to 5%, convex, the last about one-third 

 the entire length, ascending a little in front, the base obtusely 

 angular around the umbilical crevice. Aperture is vertical, 

 truncate-oval, six-toothed: one transverse columellar; two 

 folds (one angular, and one more deeply placed parietal), 

 distinct or joined at the base, and appearing like a bifid 

 tooth; three teeth in the right margin, situated deeply, the 

 middle one larger. Peristome equally expanded, the right 

 margin strongly curved above ; columellar margin dilated. 

 Length 2.5, diam. 1 mm. (Hidalgo). 



Peru: Amancaez, in the environs of Lima (type locality). 

 Ecuador: Guayaquil. Panama (Paz). 



Pupa pazi HID., Journal de Conchyl., 1869, p. 412 ; 1870, 

 p. 66 ; 1875, p. 129, pi. 7, f . 7. PFR., Monogr. Hel. Viv., viii, 

 p. 402. 



This species was well described, but the figures are worth- 

 less. In a subsequent notice Hidalgo states that the speci- 

 mens from the last two localities are those (alluded to in the 

 description) in which the angular and parietal lamellae are 

 united at their bases. I select the Amancaez specimens as 

 types. Perhaps those from the other localities are specifically 

 distinct. I have not seen South-American specimens, but 

 some Panama shells received from Sr. Paz under this name 

 prove to be typical G. servilis. G. pazi, from the description, 

 must be very close to G. prototypus, but differs by having a 

 basal fold. Until types or topotypes can be examined, its 

 exact relation to other species remains uncertain. 



Examples from the city of Guatemala, described as G. pro- 

 totypus basidentata, agree rather well with the description of 

 G. pazi, and may possibly be referable to that species. 



