MUSEUM OF COMPARATIVE ZOOLOGY. 23 



Family VERMETID^. 

 Genus SILIQUARIA Lamarck. 

 Siliquaria squamata Blainville. 

 Siliquaria modesta Dull. 



Genus VERMICULARIA Lamarck. 

 Vermicularia lumbricalis Linne. 

 Vermicularia ? nigricans Dall. 



Genus VERMETUS (Adanson) Morch. 

 Section PETALOCONCHUS Lea. 

 Vermetus erectus Dall. 



Genus BIVONIA Gray. 

 Bivonia? exserta Dall. 



Family TURRITELLID^. 



Genus TURRITELLA Lamarck. 



Section TORCULA Gray. 

 Turritella exoleta Linne. 

 Turritella acropora Dall. 



Section HAUSTATOR Montfort. 

 Turritella imbricata Linne.* 



Family MATHILDIID^E. 



Genus MATHILDA Semper. 



Mathilda yucatecana Dall. 



Mathilda (elegantissima var. ?) barbadense Dall. 



Mathilda Rushii Dall.* 



Mathilda scitula Dall.* 



Subgenus GEGANIA Jeffreys. 

 Qegania Jeffrey si Dall.* 



Family SEGUENZIIM:. 



Genus SEGUENZIA Jeffreys. 



Seguenzia ionica Watson. 

 Seguenzia monocingulata Seguenza. 



