XXXIIL. — CoEcum vENUSTU

Testa cylindrica, elongata, leviter arcuata, tenui, vitrea nitida, superne levi, inferne transversim et irrequlariter plicata, aperturam versus paulo inflata, et annulis rotundatis ornata, deinde contracta ; apertura viæ declivi, marginala ; seplo submamillato, cylindraceo, prominente, apice ad dorsum curvo; margine laterali convexo ; operculo 2...

Long. 0®,0018. Diam. Om,0004.

Troisième subdivision. — ANNEAUX PLANS, XXXIV.-—- CŒCcUuM STRANGULATUM.

. Testa ( quoad genus ) magna, elongata, robusta, sub-