Order X. NUDIBRANCHIATA. 

 No genera monographed. 



SUB-CLASS PTEROPODA. 



Order XI. THECOSOJIATA. 



Order XII. GYMNOSOJIATA. 



No genera monographed. 



SUB-CLASS PROSOPOCEPHALA. 



Order XIII. SOLENOCONCHA. 



No genera monographed. 



CLASS C. CONCHIFERA. 

 Order XIV. DIMVARIA. 



