29:1 



Notes on Lingual Dentition of MbUusca. 



In figure 11 outlines are given of one central tooth and the 

 three laterals o 3ide of the Lingual membrane, with(aand&) 



- of two separate laterals, to show variation in the den- 

 ticulations. 



Tl e generic characters of the animal of Tulotoma never having 

 given, we add them here. Foot moderate, not produced 

 beyond the snout. Color dark blue. Bead and snout small. 

 Lingual teeth as described above. Right tentacle broad. Left 

 cervical lappet small ; right larger, trough-shaped. Branchial 

 lamina' numerous, long, narrow, crowded in a double row. 



i t.i. 18. 



HctorioH Iciit'Ofloii of Rafinesque* 



The name Mesodon leucodon, Raf., has found its way into the 

 book- aa a Bynonym of Helix ihyroides. As no description of any 



such species wasever published by Kafinesque, 

 we have expressed the opinion that it was ori- 

 ginally a manuscript name sent by Kafinesque 

 to Ferussac. (Terr. Moll. II. S., IV., 54.) 

 Since that time we have Been a, manuscript 

 work by Rafinesque, entitled "Conchologia 

 Ohioensis," given by Prof. Ealdeman to the 

 Smithsonian Institution. In this there occurs 

 not only a description, but a figure of Mesodon 

 leucodon. These are here copied as concho- 

 Iogical curiosities. They have, of course, no 

 scientific value. 

 lauoodonthjToMe. " Mesodon Leucodon. Roussatre, vane* de 

 petitea taches brunes, irregulieres, provenantes de I'animal; 

 finemenl strie'enti bordi aigu, r£flechi; dent blanche, 



oblique au milieu de la bouche; forme bombee; convexe, obtuse ; 

 c »116, membraneux." 

 The operculum referred to is no doubl the epiphragm. 

 In the same manuscript are other figures scarcely recognizab 

 but 1/ Ion labiatum, a species not described in any 



