292 HAAS : ABIDA AND CHONDRINA. 



24. 2 2 2 sexplicata Bof. (XXV, p. 53) = ilerdensis 



Fag. (XXV, p. 56) ; sexplicata var. 

 minor Bof. (Ann. Junta Ciene. Nat. 

 Barcelona, II, 1917, p. 545). 



25. 2 2 3 avenacea Brug. (XXV, p. 10, pi. 1, f. 4-6), 



and var. domicella West. (XXV, p. 54) ; 

 aureacensis Loc. (XXV, p. 14). 



26. 2 2 4 duplicata Kstr. (XXV, p. 14, pi. 1, f. be- 



low f. 7). 



27. 2 3 2 One specimen ; Escalas de Sopeira. 



28. 3 2 4 



The above table will serve at the same time for a list of 

 synonyms of this form. The literature may be found in Vol. 

 XXV as cited above. Besides this, it is to be found in the 

 Estudis of Bofill and Haas as follows : I, p. 91 ; II, p. 87, pi. 

 3, f. 9, 10; III, p. 101; IV, p. 125, pi. 2, f. 5-26; V, p. 372; 

 VI, p. 334; VII, p. 92. 



During the preparation of the seven Parts of these Estudis, 

 Bofill and I several times changed our point of view regard- 

 ing the local races in question. As we at first, in the valley 

 of the Esera, only found specimens which represented Bour- 

 guignat's P. penchinatiana, we continued them under that 

 name. When we studied those of the neighboring valleys 

 eastward, we found in the course of time all transitions from 

 penchinatiana to the toothless faririesi, so that the latter name, 

 as the oldest, was chosen to denote it. In the valley of the 

 Llobregat, finally, the typical avenacea and even more fully 

 toothed forms were added to those already treated, so that we 

 reached the opinion that all the tooth-reduction forms could 

 not be separated from avenacea; thus we placed them under 

 this name in the last three of our Estudis. 



This opinion can no longer be held today, since I have been 

 able to study material of avenacea in great quantity from 

 outside of Spain and the Pyrenees. The recognized constancy 

 of the apertural characters of this species in all other parts 

 of its area of distribution is so sharply detached from the 

 mutability and plasticity of the shell-form in the region now 



