PERRIERIA. 189 



E. exarata. Sc., supracolumellar lamella; col., columellar 

 lam.; p., parietal lam.; pal.., palatal plicas; subc., subcolumel- 

 lar lamella. The dotted line running to col., on the right 

 side, below, in the figure, is too short, not really reaching to 

 the columellar lamella. 



Genus PERRIERIA Tapparone Canefri, 1878. 



Perrieria T. C., Journ. de ConchyL, 1878, p. 169 (April 1) ; 

 Annali Mus. Civ. Stor. Nat. Genova, xix, p. 108 (1883). 

 CROSSE, J. de C., 1879, p. 39. HEDLEY, Proc. Linn. Soc. N. 



5. Wales, vii, p. 313, 1893. Perieria TAPPARONE CANEFRI, 

 Comptes-rendus Acad. Sci., 1878, p. 1150 (meeting of May 



6, 1878). 



" Shell sinistral, fusiform, many- who rled, the apex trun- 

 cate; aperture elliptical; peristome continuous, expanded; 

 axis sinuous, twisted at the base, so that the columella ap- 

 pears truncate or subdentate " (T. C.). 



Type P. clausili&formis. Distribution of the typical forms, 

 western New Guinea. Named for Edmond Perrier, zoologist. 



The soft anatomy is unknown, and the internal structure 

 of the shell has not been investigated. What relationship the 

 genus bears to the externally similar forms of Queensland 

 remains to be determined. The closure of the umbilicus and 

 the absence of any evidence of parietal or columellar lamellae 

 at the mouth, in Perrieria, differentiate it from the species 

 of Queensland. 



By inadvertence the generic name was spelled Perieria in 

 the published note of the communication to the Academie 

 des Sciences. 



1. P. CLAUSILLEFORMIS Tapparone Canefri. PI. 30, figs. 20, 



21, 22. 



" Shell narrowly fusiform, rather thick and shining; 

 brown-corneous, whitish on the back (perhaps accidentally) ; 

 the peristome paler. Spire turrite, tapering above the middle, 

 the apex decollate. Whorls remaining iy 2 , regularly increas- 

 ing, convex-flattened, obliquely and closely, longitudinally 

 incised-striate, separated by an impressed and subcrenulate 



