BERENDTIA. 57 



Peristome free, expanded, thin, acute, the outer margin well 

 arched, the spreading columellar margin somewhat covering 

 the perforation. Columella twisted-arcuate, obscurely toothed 

 at the base. Length 30% to 33, diam. 5 mm. (Mabille). 



Lower California: Plateau de San Zavier, 25 degrees N. 

 lat. (Diguet). 



Berendtia digueti J. MABILLE, Bulletin de la Societe Philo- 

 mathique de Paris, vii, 1894-1895, p. 70. 



Larger than the other Lower Californian species, having 

 the last whorl free, and distinguished by its intercostal sculp- 

 ture. The locality assigned may mean the Mission of San 

 Xavier, near the parallel of 26 degrees N. lat. 



Genus BERENDTIA Crosse & Fischer, 1869. 



Berendtia C. & F., Journal de Conchyliologie, xvii, 1869, p. 

 191 ; xviii, 1870, p. 22 ; Miss. Scient. Mex., Moll., i, p. 300. 

 PFR., Monogr., viii, p. 450. 



Shell rimate turreted, straightly tapering to an obtuse 

 rounded apex which is retained in adult shells. Whorls about 

 11, the first 2 vertically costellate, the next having the riblets 

 cut into spiral series of granules (pi. 18, fig. 35) ; last whorl 

 becoming free in front, acutely keeled above. Aperture ob- 

 lique, semicircular-ovate, the peristome broadly expanded and 

 subreflexed. Internal axis imperforate, very slender and 

 weakly sigmoid within each whorl (pi. 18, fig. 34, penult, 

 whorl) . 



The foot is short, acuminate behind, with a median longi- 

 tudinal groove in a contracted state. The genital system is 

 simple. Penis very long without noticeable dilation. The 

 small rounded spermatheca is borne on a narrow duct as long 

 as the penis. The nervous system resembles that of Eucalo- 

 dium. The jaw (pi. 19, fig. 45) is very thin, arcuate, having 

 9-13 wide ribs separated by narrow, cross-striated intervals. 

 The radula has 126 rows of 30.1.30 to 32.1.32 teeth, in nearly 

 straight transverse rows. The centrals are tricuspid, lateral 

 and marginal teeth bicuspid (pi. 19, figs. 46, 47). 



Type B. taylori Pfr. Table-land of Lower California. 



This genus resembles the closely related group Spartocen- 



