﻿NEW SPECIES OF LANDSHELLS FROM THE PANAMA 



CANAL ZONE 1 



(With Two Plates) 

 By WILLIAM H. DALL 



Mr. E. A. Goldman, of the U. S. Department of Agriculture, 

 in the course of exploration in connection with the Smithsonian 

 Biological Survey of the Panama Canal Zone and adjacent region, 

 investigated in May, 1912, the Pirri range of mountains to the east- 

 ward of the Canal Zone. This range attains a height, in some places, 

 of five thousand feet above the sea and apparently had not been 

 visited by any collector previously. Although it was the dry season 

 he obtained a half dozen landshells of three species, two of which 

 appear to represent new forms. 



The well-known Pleurodonte labyrintkus Desh., has been obtained 

 by Mr. Pittier from Santa Isabel, Panama, and is represented by 

 fairly large series from various localities in the National Collection. 

 The characters, having regard to difference of age, are very con- 

 stant and uniform throughout the series. In fact as in the case 

 of P. tenaculum, now represented by several specimens, the material 

 from the Canal Zone shows no more variation within the species 

 than would be noted by a careful observer in a similar series of 

 a species from the temperate zone. It is probable that as in many 

 other cases in better known regions, what appear in a miscellaneous 

 lot of specimens without exact locality data to be mere individual 

 variations, would prove, were our knowledge more complete,, to be 

 tolerably constant racial or specific characters. 



A single specimen was obtained by Mr. Goldman which differs so 

 much from the typical P. labyrinthus that I am compelled to regard 

 it as distinct. 



PLEURODONTE (LABYRINTHUS) GOLDMANI, new species 

 (Plate 2, Figures 1, 2) 

 Shell lenticular, purplish-brown, with a sharply carinate periphery 

 and finely granulate surface, about six and a quarter whorls ; the 

 nuclear 2^2 whorls are sculptured with fine, slightly vermicular, 

 close-set radial lines in harmony with the lines of growth ; this 

 sculpture ceases abruptly and is replaced by the ordinary incre- 



1 This paper is the thirteenth dealing with the results of the Smithsonian 

 Biological Survey of the Panama Canal Zone. 



Smithsonian Miscellaneous Collections, Vol. 59, No. 18. 



