EPIROBIA. 61 



animals, at best an unsatisfactory basis for critical work, even 

 in the hands of so skillful an operator. 



The specialization of both shell and radula seem to me to 

 make a union of this genus with Holospira unnatural. 



Key to Species of Epirobia. 



I. Diameter contained 4-5 times, and longest axis of aperture 

 5-5 1/2 times in length of the shell. 



1. Whorls 14 ; 12% x 3 mm. ; very closely rib-striate. 



E. berendti, p. 61. 



2. Whorls 17 ; 14 x 3 mm. ; very closely and finely hair- 

 striate. E. gassiesi, p. 63. 



II. Diam. contained 6-8 times, and aperture 8-10 times in 

 length of shell. 



1. Whorls 21 ; 18 x 2% mm. ; minutely rib-striate, the 

 striae white, absent in places. E. swiftiana. p. 62. 



2. Whorls 22-24 ; 16 x 2 to 17 x 2% mm. ; finely arcuate- 

 striate. E. apiostoma, p. 63. 



3. Whorls 22 ; 14 x 21/4 mm. ; whorls very short ; closely 

 arcuate-striate. E. polygyrella, p. 65. 



4. Whorls 24-27; 17-19 x 2y 2 mm.; fine thread-like 

 striae. E. polygyra, p. 64. 



E. BERENDTI (Pfeiffer) . PI. 20, figs. 1, 2, 3. 



Shell deeply rimate, subperforate, cylindric-turreted, very 

 closely rib-striate, slightly silky, violaceous-brown; spire en- 

 tire, the apex subacute, pale; suture deep. Whorls 14, con- 

 vex, the last becoming free, shortly produced forward, cylin- 

 drical, somewhat compressed dorsally. Aperture slightly 

 oblique, rounded, subangular above; peristome continuous, a 

 little expanded throughout. Length 12%, diam. 3 mm. ; long- 

 est axis of aperture 2% mm. (Pfr.). 



Toxpan (Tuxpan) , on the slope of the mountain Matlagui- 

 ahuitl, near Cordova, State of Vera Cruz (Berendt). 



Cylindrella berendti PFR V Malak. Blatt., xiii, 1866, p. 87; 

 Monogr., vi, p. 381. FISCHER & CROSSE, Miss. Scient. Mex., 

 Moll., i, p. 409. Epirobia berendti Pfr., STREBEL, Beitrag, iv, 

 p. 86, pi. 13, f. 1; pi. 14, f. IS. Holospira berendti Pfr., 



