40 



THE BRITISH NUDIBRANCHIATE MOLLUSCA. 



ANALYTICAL TABLE OF THE FAMILIES AND GENERA. 



(This Table is intended as an index to the Synopsis, and will, it is hoped, afford a ready means of 

 ascertaining the genus of any specimen from an examination of the external characters.) 



Branchiae plumose, surrounding the vent on the medio-dorsal line 

 Cloak ample 



Tentacles retractile within cavities . 

 Cloak small or obsolete 



Tentacles retractile ( Tentacles smooth 



within sheaths { Tentacles l amina ted \ ^ d ? ati ? ct ' with a PP enda §' es 



( Cloak obsolete . 



Family . DoRimDiE. 

 Sub-Fam. Doridince. 



. Doris. 

 Sub-Fam. Polycerinte. 



. iEgirus. 

 Triopa. 

 Thecacera. 



f Cloak distinct, with a smooth or undulated margin Goniodoris. 



Family 



Idalia. 



Polycera. 



Ancula. 



. Tritonia. 

 . Scyllaea. 



Eolidim. 



Tentacles non-retractile J Cloak indistinct, with marginal filaments 



without sheaths . . ] Cloak rudimentary, with marginal tubercles 



V_ Cloak obsolete, tentacles with basal filaments 



Branchiae laminated or tufted, arranged along the sides of the back : ] „ ., „ 



liver entire . ;| Family . Teitoniad^. 



Branchiae laminated, set along a pallial ridge at the sides of the back . 



Branchiae tufted, covering the insides of lobes at the sides of the back . 

 Branchiae papillose, rarely ramose, set along the sides of the back ; 

 liver defused and branched . 

 * Tentacles 2, sheathed ; branchiae variable. 

 Branchiae ramose or papillose . 



Branchiae ramose, without pallial ridge 



Branchiae papillose, on a pallial ridge 

 Branchiae clavate and muricate 



Veil small 

 ** Tentacles without sheaths ; branchiae papillose. 



Vent lateral .... 



Tentacles 4 . 



Tentacles 2 . 

 Vent dorsal ; branchiae not surrounding the head 



Tentacles 4, vent latero- dorsal 



Tentacles 2, vent medio-dorsal, anterior 



Tentacles none, vent medio-dorsal, posterior 

 Vent dorsal, posterior; branchiae surrounding the head 



Dorsal tentacles united by a crest, laminated 



Dorsal tentacles without crest, not laminated 



Sub-Fam. Dendronotince. 



. Dendronotus. 



. Lomanotus. 

 Sub-Fam. Melibmince. 



. Doto. 



Sub-Fam. Eolidinee. 



. Eolis. 



. Embletonia. 

 Sub-Fam. Hermceince. 



. Fiona. 



. Hermsea. 



. Alderia. 

 Sub-Fam. Proctonotina. 



. Antiopa. 



. Proctonotus. 



