302 SHELLS AND SHELL-FISH. PART II. 



typically of great length ; base truncated,, deeply notched ; 

 inner lip smooth, convex. 



LEIODOMUS Sw. Shell very smooth, nearly polished ; 

 spire acute, slender, lengthened ; of few whorls ; 

 aperture effuse; inner lip thickened and spreading; 

 base of the pillar curving inwards. 8 species. 



Achatinum. En. M. 400. f.4. Quoyii Sw. Voy. d'Astrol. 

 vittata. En. Meth. 402. f. 4. 31. f. 17. 



TEBEBRA Lam.* Shell subulate; spire excessively 

 long, and of numerous whorls ; pillar straight ; the 

 base curving outwards (fig. 71. e). 

 maculata. En. M. 402. f. 4. Babylonica. Ib. 402. f. 5. 



BUCCINUM Linn. Shell pyriform ; spine moderate; body- 

 whorl ventricose ; base obtuse, emarginate ; lips 

 smooth (fig. 71. c). 



undatura. En. M. 399. f. 1. lineatum. Ib. 400. f. 8. 

 ? leevigatum. Ib. 400. f. 1 . f papillosum. Ib. 400. f. 2. 



TROCHIA Sw. Shape intermediate between Purpura 

 and Buccinum ; whorls separated by a deep groove ; 

 inner lip, when young, depressed, when adult, thick- 

 ened, convex, and striated ; basal canal very small, 

 sulcata. En. Meth. 422. f. 4. 



TRITONIDEA \ Sw. Shell bucciniform, but the basal half 

 is narrowed, and the middle more or less ventricose ; 

 spire and aperture equal. Pillar at the base with 

 two or three obtuse and very transverse plaits, not 

 well defined ; outer lip internally crenated, and with 



* By this group, the MURICIDS: are connected with the STROMBID^ by 

 means of the CeraUtue. 



f Probably an aberrant species of Leiodomus. 



j Mr. Gray has the merit of first publishing this intricate, but most natu- 

 ral genus, which I had many years ago also determined. I should gladly 

 have adopted his name, were it not that Pallia has been already given by 

 Hiibner and Treitsch to a genus of lepidopterous insects. Mr. Gray has very 

 happily determined what is certainly its true station in the natural system, 

 that is, intermediate between Triton and Buccinum. It is connected to 

 Triton by T. clandestinnm, Ency. Mth. 433. fig. I. (fig. 64. p. 297.), which 

 thus completes the circle of this family. 



