42 HELICEA. 



short, acute ; whorls 21, the last one very much the largest, 

 depressed, equalling | the length of the shell ; columella 

 scarcely rounded and hardly receding ; aperture very large, 

 oblique and oval ; peristome simple, regularly rounding. 



Length 12, diameter 7 millimetres. Length of the aper- 

 ture 10, breadth 6 mill. 



Geographical Distribution. East Florida (Pfeiffer) ; 

 Spring Garden, Lake Florida (Bland's Coll.) 



Remarks. It is readily distinguished from the other 

 American species by the proportionally short spire, the 

 very large body whorl, and expanded aperture. 



SUCCINEA SALLEANA Pfeiffer. 



Plate LXXIX. Figure 18. 



T. depresso-ovata, tenuissima, striatula, lineis spiralibus impressis ir- 

 regulariter notata, pellucida, nitida, corneo-albida ; spira brevissima, sub- 

 papillata; anfr. 2^, penultimus convexus, ultimus | longitudinis superans; 

 columella subcallosa, stricte recedens ; apertura axi subparallela, angulato 

 ovalis ; perist. submarginatum, margine dextro vix arcuato. Long. 19, 

 diam. 10, alt. 7 mill. Ap. 16 mill, longa, infra medium 9 lata. (Pfeiffer). 



Habitat prope New Orleans. (Salle). 



SYNONYMS AND REFERENCES. 



Succinea Salkana Pfeiffer, Proc. Zool. Soc. Nov. 1849, p. 133; Mon. Hel. Viv. 

 iii. 16. 

 Chemnitz, ed. 2, p. 49, pi. 5, f5g. 7, 8. 



Remarks. I have not seen this species. The above is 

 PfeifFer's description, and the figure given on pi. 79 is a 

 fac-simile outline of that referred to. 



Spurious Species. 



Succinea putris, Lin., (DeKay, 1839, p. 31, Fer. Tabl. Sjst. p. 9,) 



and 

 Succinea amphibia, Drap. (Forbes Br. Ass. 1837, p. 144, Ferussac ; 



Tabl. Syst. ; Binney, vol. ii. p. 159,) have been quoted from 



America. Having never seen a well authenticated specimen of 



either, I omit them. 



