152 A MANUAL OF AMERICAN LAND SHELLS. 



cutting- point, is very sbort, reacliing only about half way to the lower 

 edge of the base of attachment. Laterals of same type; the second 

 has a side cutting point. Marginals low, wide, very variable in the 

 denticles, but usually with one long, broad, sharply bifid inner denticle 

 (the inner point much the smaller), and one short, sharp, rarely bifid 

 outer denticle. There are 24 laterals. The twenty-second tooth has 

 the side cutting point; on another membrane, the twentieth (Terr. 

 Moll., V, Plate IX, Fig. L). 



GLYPTOSTOITIA.* 



Animal as in Fatula. 



Shell widely umbilicated, depressed, with wrinkle-like stricT, solid; 

 whorls G, the last depressed-globose, not falling- at the aperture ; aper- 

 ture oblique, subcircular; peristome simple, acute, thickened within, 

 its extremities ai)proached, that of the coluniellar short, scarcely re- 

 flected. 



Inhabits the Californian Eegion at San Diego. 



One species only is thus far known, Ncwhcrryannm. Its jaw is low, 



wide, slightly arcuate, ends but little at- 

 tenuated, blunt ; cutting margin without 

 median projection; anterior surface with 

 numerous (about 15), stout, separated 

 Jaw of G. Netchcrryanum. rj^j^^ deeply dcnticulating either margin. 



Lingual membrane (Terr. Moll., V, Plate X, Fig. A) long and narrow. 

 Teeth 47-1-47, with 17 perfect laterals. Centrals with the base of 

 attachment long and narrow, with greatlj' expanded lower, lateral 

 angles, the upper margin rounded, broadly reflected; reflection large, 

 stout, with obsolete side cusps, but with decided, triangular side cut- 

 ting points ; median cusp very stout, short, with a long, acute cutting 

 I)oint reaching beyond the lower edge of the base of attachment. Lat- 

 erals like the centrals, but asymmetrical by the suppression of inner, 

 lower, lateral angle of the base of attachment and inner side cutting 

 point. The transition from laterals to marginals is marked by the 

 lesser proportional development of the cusp and greater development 

 of the cutting point. Marginals low, wide, tlie retlection equaling the 

 base of attachment, and bearing one inner, short, stout, oblique, blunt 

 cutting point, and one outer, shorter, blunt cutting point. This species, 



*The name is suggested by the sculptured parietal wall of the aperture in young 

 specimens of the only species known, q, v. 



