LIMACID^. 185 



FAMILY LIMACID^. 



Shell rudimentary, a calcareous plate, not spiral, concealed 

 under the mantle, and covering the respiratory cavity. Foot 

 without mucous pore. Jaw oxygnathous, arcuated, without 

 ribs, with a rostriform projection on the inferior margin. 

 Central tooth of the lingual series tricuspidate, the middle cusp 

 long and narrow, laterals bi- or tricuspidate, marginals narrow, 

 sharply uni- or bicuspidate. 



Synopsis of Genera. 

 Genus LIMAX, Linn., 1758. 



Animal attached its whole length to the foot, subcylindrical, 

 somewhat truncate anteriorly, tapering behind and carinate 

 towards the tail, without mucous pore ; mantle small, anterior, 

 forming a shield and enclosing a nonspiral calcareous plate, 

 locomotive disk distinct, trizonate, respiratory orifice posterior 

 on the right margin of the mantle. Jaw smooth, with median 

 projection (PI. 44, fig. 2); lingual membrane long and narrow; 

 central teeth tricuspid, laterals bicuspid, marginals aculeate, 

 often bifid (PL 44, fig. 1). Shell-plate with lateral nucleus. 

 Animal lively. 



Here may be referred Lallemantia, Mabille, in which the 

 portion of the shield over the shell-plate is raised, simulating a 

 second, smaller shield : a character of certainly no more than 

 specific importance. 



Limacus, Lchmann, may also be referred here. 



Section LIMAX (sensu stricto}. 



= Heynemannia, Malm, = Eulimax, Moquin-Tandon ; Stabilia, 

 Chromolimax , Opilolimax, Gestroa, Pini; Limacus, Lehmann ; 

 Frauenfeldia, Hazay. Animal having a concentrically striated 

 shield ; lively in habit. Central tooth of the lingual series 

 sharply one-pointed, obsoletely tricuspidate, marginal teeth 

 bifid. Eggs ellipitical. Shell-plate with terminal lateral nucleus. 



Section LEHMANNIA, Heynemann, 1863. 



Median teeth of the radula, with a rounded point ; eggs oval. 

 Animal of softer texture than Limax. Shell-plate with lateral 

 nucleus. 



