ODONTOSTOMINvR. 



27 



Folds within the outer Up: Sutural, suprapalatal, upper palatal and 

 lower palatal folds. 



In Tomigerns (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- 

 tutus. Fig. 3, Anostoma. Fig. 4, Tomic/erus turbi-itatus. Fig. 5. Macrodonlex 

 odontostomus . A, angular lamella; Ac, infrapalatal fold; J9, basal told; C, colu- 

 mellar lamella; C/, fold of the columella; IP, infra parietal lamella; LP, lower 

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

 supracolumellar lamella; 8P, suprapalatal fold; Sut., sutnral fold; UP, upper 

 palatal fold. 



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

 infraparietal lamellae being all present and separate. In Hyperaulax 

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



