40 CHONDRINvE OP THE PYRENEAN CENTER. 



(d. Species of Portugal, the Province of Cadiz, and Morocco.) 

 24. CHONDRINA LUSITANICA ('Rossm.' Pfr.). PI. 3, figs. 5, 6. 



The shell is subperforate-rimate, cylindric-coiiic, very ob- 

 liquely, irregularly ribbed, brown ; spire tapering, obtuse ; 

 whorls 8, convex, the last ascending at the end, the neck 

 sharply costulate, buff ; base somewhat compressed obliquely ; 

 with 4 white lines. Aperture suboval, liver-colored, 8-plicate : 

 2 rather long lamella?, near together, on the parietal wall, one 

 extending to the outer margin where it connects with the in- 

 sertion, the other more immersed ; 2 moderate folds on the 

 columella ; 4 in the palate, showing outside white through the 

 tawny throat, the upper one remote and small, the second 

 curved, reaching the margin, the third and fourth shorter and 

 a little further in. Peristome spreading, somewhat thickened, 

 the outer margin angularly curved above. Length 7, diam. 3 

 mm. (Rossm.). 



Portugal: Serra d'Arzabida [Arrabida] (type loc.) ; many 

 places in provinces Douro, Beira and Estremandura (Nobre). 



Pupa, lusitanica Rossm. in litt., PFR., Monogr., ii, 1848, p. 

 347. ROSSMAESSLER, Iconogr., iii, 1859, p. 105, pi. 85, f. 935. 

 LOCARD, Conchyl. Portugaise, Arch. Mus. d'Hist. Nat. Lyon, 

 vii, 1899, p. 147. - - Pupa avenacea var. luzitanica Rossm., 

 NOBRE, Annaes Sci. da Acad. Polytech. do Porto, iii, 1908, p. 

 50, pi. 1, f. 3, 4. 



This form is distinguished from avenacea chiefly by the 

 strong rib-striatiou and the internally thickened lip, produc- 

 ing a light tawny area behind the lip. The teeth are strongly 

 developed, the angular entering as far as the parietal, no divi- 

 sion into angular and spiral lamella? being evident. The 

 minute denticle in the base is sometimes nearly obsolete, and 

 the suprapalatal is minute. 



Some authors have considered lusitanica a variety of ave- 

 nacea, but it is surely quite distinct by the callous thickening 

 in the throat and the strong sculpture. It belongs to a group 

 of forms chiefly developed in the Pyrenees, and not to the 

 immediate group of avenacea. Whether the true avenacea 

 occurs in Portugal is highly doubtful ; its western limit has 



