MUSEUM OF COMPARATIVE ZOOLOGY. 23 



Family VERMETIDiE. 

 Genus SILIQUARIA Lamarck. 

 Siliquaria aquamata Blainville. 

 Siliquaria modeata Dall. 



Genus VERMICULARIA Lamaeck. 

 Vermicularia lumbricalis Linnc. 

 Vermicularia ? nigricans Dall. 



Genus VERMETUS (Adanson) Morch. 

 Section PETALOCONCHUS Lea. 

 VermetuB erectua 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^. 



Genus MATHILDA Semper. 



Mathilda yucatecana Dall. 



Mathilda (elegantissima var. ?) barbadense Dall. 



Mathilda Ruahii Dall-* 



Mathilda acitula Dall.* 



Subgenus GEGANIA Jeffreys. 

 Gegania Jeflfreysi Dall.* 



Family SEGUENZIID^. 

 Genus SEGUENZIA Jeffreys. 



Seguenzia ionica Watson. 

 Seguenzia monocingulata Seguenza. 



