HAAS: ABIDA AND CHONDRINA. 287 



forma aucta of goniostoma is distinguished by the possession 

 of 6 palatal folds, which apparently are the upper-, lower- 

 and infra-palatals of typical goniostoma, to which two weak 

 supra-palatals and one basal have been added. C. goniostoma 

 var. juliensis Bourguignat is characterized by the possession 

 of two folds at the insertion of the right lip-margin. 



Bofill and Haas, in their first six Estudis imposed the name 

 P. megacheilos goniostoma upon Ghondrina bigorriensis tenui- 

 marginata. 



Pupa crassata Fagot, from the Escalas de Sopeira in the 

 valley of the Noguera Ribagorzana, is a form with strongly 

 expanded, thick peristome, such as may be formed by speci- 

 mens living where the country rock is calcareous. In pi. 26, 

 fig. 3, I figure a cotype. 



Pupa angulata Fagot, from the valley of the Esera, is that 

 form of C. b. tenuimarginata in which the angularity of the 

 lower margin of the aperture is most pronounced. A topo- 

 type is figured, pi. 26, fig. 4. 



Finally, Pupa adeodati Fagot is, according to a communi- 

 cation from Father Adeodat Marcet of the Monastery of 

 Montserrat, a deformed specimen of G. b. tenuimarginata 

 found on the mountain of the same name. 



The three specimens from the valley of the Noguera Riba- 

 gorzana, between Pont de Suert and Sopeira, shown in pi. 26, 

 figs. 5, 6, 7, 8, give an idea of how little constancy there is in 

 the characters of the aperture (strength of the teeth, angle of 

 the lower part of the peristome, strength or expansion of the 

 peristome, etc.). They Avere collected on the same cliff, and 

 with equally strong peristomes show three different forms of 

 aperture. The difference in size is not so considerable as in 

 other localities to be discussed later. A race with very weak 

 development of peristome lives on the mountains near the 

 coast in the northern part of Barcelona Province (Caldas de 

 Montbuy, San Miguel del Fay and so on) ; it shows the lower 

 peristomal angle especially strong, as in pi. 26, fig. 9, a speci- 

 men from Caldas de Montbuy. 



The following will serve to illustrate the size variation, in 

 specimens measured from El Bruch, near Montserrat: 7.5 to 



