ODONTOSTOMINyE. 



27 



Folds within the outer lip: Stitural, suprapalatal, upper palatal and 

 lower palatal folds. 



In Tomigerus (fig. 4) and Anostoma (fig. 3), the primitive con- 



L? 



FIG. 3. 



FIG. 4. 



FIG. 5. 



Fig. 1, Odontostomus (Cyclodontina) pupoides. Fig. 2, O. (Plagiodontes) den- 

 tatus. Fig. 3, Anostoma. Fig. 4, Tomigerus turbi'natus. Fig. 5, Macrodontex 

 odontostomus. A, angular lamella; Ac, infrapalatal fold ; J5, basal fold ; C, colu- 

 mellar lamella; Of, fold of the columella; JTP, infraparietal lamella; Z/P, lower 

 palatal fold; P, parietal lamella; SC (in Fig. 5), subcolumellar lamella (in Fig. 4), 

 supracolnmellar lamella; SP, suprapalatal fold; Sut., sutural fold; UP, upper 

 palatal fold. 



dition of the parietal armature remains, the angular, parietal and 

 infraparietal lamella being all present and separate. In Hyperaulax 

 ramagei the parietal lamella is absent, the other two remaining. 



