592 HELICINACEA. 



characters by which to designate and divide the several 

 genera : semioval or triangular. 



PfeifFer gives these as additional characteristics to those 

 of the suborder. 



There are several genera comprised in the family, 

 Alcadia, Trochatella^ Luddella, Stoastoma^ and Helicina, 

 but the latter only has been found in this country. 



For remarks on the animals of this family, see vol. ii- 

 p. 350. 



GENUS HELICINA LAMARK. 



HELICINA CHRYSOCHEILA BINNET. . . .vol. ii. p. 354, pi. Ixxiv. fig. 4. 



Helicina chrysocheila PFEIFFER, Mou. Pneum. Viv. ii. p. 197. 



I have in my cabinet my father's type of this species, 

 and consider it distinct from Hel. Jamaicensis Sowb., and 

 all other described species. I have a note taken by my 

 father at the collection of M. Petit, in Paris, in which he 

 says that a similar shell is labelled from Tampico. 



In the collection of the Smithsonian Institute is an 

 individual from Texas, (Wurdemann.) It seems allied to 

 Hel. turbinata Wiegm. 



Shuttleworth has used this name (1852) for another 

 species, but has not priority. 



HELICINA HANLEYANA PFEIFFER. 

 PLATE LXXV. FIGURES 14, 16. 



T. globoso-conica, solidula, lineis concentricis impressis, subdistantibus 

 sculpta, vix diaphana, nitida, fulvo-cornea ; spira breviter couoidea, 

 obtusinscula ; anfr. 5 vix convexiusculi, ultimus rotundatus, antice sub- 

 descendens ; apertura parum obliqua, subsemicircularis ; columella bre- 

 vissirna, extrorsum denticulata, eallum tenuem, albidutn, diffusum emit- 

 tens; perist. album, vix expansiusculum, intus subincrassatum, basi in 

 denticulum columellse abiens. Operc. ? Diam. maj. 7, min. 6^, alt. 5| 



mill. 



Habitat prope New Orleans (Salle). 



