HALACOZOA. GASTEROPODA. PULMOBRANCHTATA. TERRESTRIA. 4/ 



1. Succinea putris. — Shell ovato-oblong, very thin, 

 transparent, glossy, with the spire short, the mouth 

 ovate, vertical, two-thirds of the whole length. Putris, 

 filthy. 



A. S. piitris gracilis. Gracilis, slender. 



Genus 6. Bulimus. — Shell ovate, oblong, or subcylin- 

 drical, spiral, thin; the last turn proportionally larger 

 than the next ; the aperture oval, entire, toothless, not 

 half so long as the spire ; peristome incomplete, thick- 

 ened. The name perhaps from fiovWfxos, insatiable 

 hunger. Bruguiere. 



1 . Bulimus lubricus. — Shell ovato-cylindrical, shining 

 faintly striated, with the aperture ovato-trigonal, the 

 peristome thicked, but not reflexed. Lubricus, smooth, 

 slippery, or glossy. 



2. Bulimus obscurus. — Shell ovato-oblong, slightly 

 lossed, faintly striated, with the aperture subovate, the 



peristome somewhat thickened and spread. Obscurus, 

 dusky or dull. 



Genus 7. Pupa. — Shell oblongo- cylindrical, thin, 

 spirate ; the last turn not much larger proportionally ; 

 the aperture semioval, with the peristome incomplete, 

 thickened, and reflexed. Pupa, a doll or puppet ; also 

 an insect in the second state of its existence, in which 

 it resembles this shell. 



1. Pupa umbilicdta. Shell oblongo-cylindrical, with 

 the aperture semiovate, subangulate, the peristome thick 

 and flattened, a laminar tooth in or near the angle 

 formed by the junction of the outer lip, the umbilicus 

 narrow. Umbilicatus, having an umbilicus. 



2. Pupa margindta. — Shell oblongo-cylindrical, with 

 the aperture nearly circular, the peristome thin, but 

 with a strong convex external rib behind it on the outer 

 lip, an obtuse, often obsolete tooth in the middle of the 

 columellar space. Marginatum, having a rim. 



Genus 8. Vertigo. — Shell subcylindrical, very thin, 

 spirate ; the last turn not proportionally larger ; the 

 aperture semiovate, toothless, the peristome slightly 



