228 THE CHICAGO ACADEMY OF SCIENCES. 



*Teeth five to seven, parietal tooth directed 

 toward the center of the outer lip; base of 

 shell rounded armifera 



**Teeth three to four, parietal tooth directed 

 toward the base of the aperture ; base of shell 

 keeled, an elevated callus connecting termi- 

 nations of peristome contracta 



***Teeth generally six in number, parietal tooth 

 directed toward the base of the aperture, bi- 

 furcated; no elevated callus connecting peri- 

 stome terminations holzingeri 



3. Teeth numerous, but small, three basal teeth; pari- 



etal tooth simple. 



tParietal tooth small, straight; eight teeth pentodon 



ttParietal tooth larger, curved; six teeth curvidens 



4. Teeth generally small; a large, elevated, long.curved 

 gular lamina on the base of the aperture; two small, 

 pointed parietal teeth milium 



b. Aperture much wider than long, triangular, with a pe- 

 culiar bulge at the upper, right hand corner; teeth 

 five to seven, one to three parietal, two columellar, two 

 basal, all small and very long ovata 



GENUS PUPOIDES Pfeiffer. 



Shell: "Turriculate, aperture with a strong lip, without 

 any lamellae except a small, angular nodule." (Sterki.) 



Animal: Blunt before and tapering behind; no caudal 

 mucus pore or locomotive disk. 



88. Pupoides marginatus Say, pi. xxx, fig. 9. 



Cyclostomamargtnata SAY, Journ. Phil. Acad., Vol. II, p. 172, 1821. 



Pupafallax SAY, of most American authors. 



Pupa aKzonensis GABB, Amer. Journ. Conch., Vol. II, p. 331, 1866. 



Shell: More or less fusiform, smooth; surface covered 

 with very fine, oblique lines of growth, the apex being smooth; 

 color brownish-horn, lighter on the apex; whorls six, convex, 

 regularly increasing in size from apex to base; sutures im- 

 pressed; aperture oval or rounded; peristome reflected, whit- 

 ish, the reflected portion lined with a thick callus; termina- 

 tions curved, the right one very much so; no denticles within 

 the aperture; umbilicus open, deep. 



Length, 4.75; diameter, 2.00; aperture long, 1.30 mill. (10130.) 

 5.00; " 2.00; " " 1.30 " (12403.) 



Animal: With the eye-peduncles, head, neck and fore 

 part of the body black, the balance lighter; the animal is 



