BRITISH MARINE TESTACEOUS MOLLUSCA: 
Third Division. 
LATERIBRANCHIATA. 
(ZASTEROPODA< CYCLOBRANCHIATA. 
CERVICOBRANCHIATA. 
Hermaphrodita, sine congressu. 
* Lateribranchiata. 
DENTATTADES. «ec. 026. 05 OSes  Dentalium: 
** Cyclobranchiata. 
CHITONIDS ....... EAE oe ARB . .. Chiton: 
*** Cervicobranchiata. 
PATELLUD Ay one ween ; wae eee aeavella 
Acmeea. 
Pileopsis. 
Calyptreea. 
Emarginula. 
Fissurella. 
Puncturella. 
Haliotis. 
Fourth Division. 
PLEUROBRANCHIATA, 
CRYPTIBRANCHIATA. 
PULMONIFERA. 
PARS-PECTINIBRANCHIATA. 
GASTEROPODA 
Hermaphrodita,—congressu. 
* Pleurobranchiata. 
REnUROBRAN CHD Alas: sic tieilevererersr Pleurobranchus. 
** Cryptibranchiata. 
APEYSTADAG cI Gents swe OID eS Aplysia. 
BU LED ah fii sec stator tater ont alee als Bulla 
Bulla. 
Otina? 
