BULIMUS citiinus, 

 Citron BuUmus. 



Generic Character. — See PI. 4. 



Specific Character. 



B. testa obovata; spird conica, in medio sub-crassata, apertura longiore: spira 

 anjractibus 6 in sulurain depressis ; labia exteriore basi rotundato ; umbi- 

 lico subclauso. 



Shell obovate; spire conic, slightly thickened in the middle, longer than 

 the aperture, and of six volutions depressed on the suture; outer-lip 

 rounded at the base; umbilicus nearly closed. 



Bulimus citrinus, var. B. Bntgiiiere Enci/cl. Meth. 314. no. 27. 



Martini 9. tab. 110. fg. 930. 



1 HIS variable species is perhaps the most beautiful and deli- 

 cate in its colouring of all the terrestrial snails ; yet, although 

 figured by several of the older writers, so little justice has been 

 done it, that we make no apology for introducing it into the pre- 

 sent work, both on this account, and for the purpose of giving 

 such a discriminative specific character as may lead to the in- 

 quiry, how far all the numerous varieties mentioned by authors 

 really belong to this species or not. As far as my own observa- 

 tion goes, I have found that the thickened spire, the depression 

 of the whorls on the suture, and the narrowness or contraction 

 of the mouth at the base, afford the only constant characters ; 

 for, in regard to colour and the situation of the mouth, both ap- 

 pear subject to great variation, the latter being as often reversed 

 as regular. Martini's is the only figure that can be safely quoted 

 for this variety. 



I am indebted to Mrs. Bolton, of Storr's-hall, Windermere, 

 for the loan of this and several other rare shells : it formerly be- 

 longed to Mr. Jennings, and appears an old shell, being heavy in 

 proportion, the umbilicus thickly closed up, and the outer-lip 

 PI. 46. 



