HAAS: ABIDA AND CHONDRINA. 281 



Id. Abida affinis bofilli (Fagot). PI. 25, figs. 8, 9. 



Pupa bofilli Fagot, Ann. Malac, II, p. 189. 

 Abida bofilli (Fagot) Pilsbry, Manual XXIV, p. 292. 

 Pupa (Modicella) affinis bofilli, Bofill and Haas, Est. V, 

 p. 367, pi. 3, f. 14-17 (complete literature). 



Remarkable for its constantly small size (8 mm. high, 2 mm. 

 diani.), weaker folds in the rounded aperture and the thin 

 shell. Apparently to be viewed as an adaptation to the dis- 

 trict it inhabits, poor in lime but rich in gypsum. A topo- 

 type is figured, pi. 25, figs. 8, 9. 



The habitat of this local race is the gypsum-marl formation 

 of the lower Llobregat district; type-locality, the Cloister 

 mountain Montserrat. 



le. Abida affinis andorrensis (Bgt.). PI. 25, figs. 10-13. 



Pupa andorrensis Bourguignat, Rev. Mag. Zool., 2 ser., XV, 

 1863, p. 153, pi. 14, f. 17-19. 



Abida andorrensis Pilsbry, Vol. XXIV, p. 293, pi. 44, f. 

 14, 15. 



Pupa andorrica Fagot, Hist. Mai. Pyr. Franc. Esp., 1892, 

 p. 94. 



Pupa (Modicella) affinis andorrensis Bofill and Haas, Est. 

 IV, p. 119, pi. 1, f. 15-23 (complete literature references). 



Pupa tuxensis Fagot, in Westerlund, Nachr. Bl. D. Mai. 

 Ges., XXXIV, 1902, p. 40. — Fagot, Butll. Inst. Cat. Hist. 

 Nat., V, 1905, pp. 139, 143. 



Actually typical A. affinis, as figured by Rossmassler, does 

 not occur in the Segre valley, but a local race of it is found 

 there, resembling affinis in general shape of the shell and in 

 structure of the apertural armature, yet distinguished by the 

 stronger and more spreading peristome. This thickening and 

 expansion of the peristome gives the aperture a rounded ap- 

 pearance, and brings about the disappearance of the embay- 

 ment or shallow sinulus so characteristic of A. affinis affinis. 

 Specimens thus characterized, therefore differing from the 

 specific type only in development of the peristome, were named 

 P. tuxensis by Fagot. A cotype of this form, from Tuxent at 

 about 1000 m. elevation, is drawn in pi. 25, figs. 12, 13. A 

 higher plane of evolution is represented by the specimens 



