244 On the Lingual Dentition in the Gasterepoda. 
differ more strikingly from the plummet, as shown in the 
following table :— 
Bucciniwz deter- 
. : System of System of 
mined by the Lin-/System of Gray*. y y 
eual ee rea y Y| Woodward}. |H.& A. Adamsf. 
Buccinum Buecinum Buccinum Buccinum 
Cantharus a * ss 
Pisania + “ . 
Pusiostoma a a 5 
Cominella as Cominella Cominelia 
Chrysodomus ss a i 
Nassa + Nassa Nassa 
Neritula % Cyclonassa Neritula 
Cassidulus . 5 F 
Triumphis o + “ 
Mvricipzm. 
Murex Murex Murex Murex 
Purpura ; ” ” 
Topas ” ” ” 
Trophon Trophon Trophon Trophon 
Concholepas§ S . ; 
Monoceros 6s + op 
Vitularia $3 + Vitularia 
Rapana ~ Rapana | > 
Muricidea + 3 Muricidea 
Fusus or Colus 55 ‘ 3 
proboscidialis 
Hemifusus or 3 2 Hemifusus (Sw. ) 
Cochlidium tuba 
Sistrum§ ” ” ” 
Were all the genera included in each system given zn ex- 
tenso, a very much greater difficulty would present itself to 
the mind of any one attempting to reconcile their differences. 
Enough has been said, however, to show that the lingual 
dentition would appear to be the only appeal. Indeed the 
effort to accomplish this desirable object in any other way 
would only lead to unscientific dispute, and develop no satis- 
factory result. 
In a subsequent paper I shall consider the relationships of 
all the families of proboscidiferous Gasteropoda in which the 
central and often the pleural teeth point ene backwards 
without recurvature—in short, the Orthodontal Proboscidifera. 
Haslar Hospital, Sept. 11, 1868. 
+ Manual of Mollusca. 
§ Omitted in Muricidie above. 
* Guide to Mollusca, vol. i. 
{ Genera of Mollusca. 
