XIV 



A MONOGRAPH OF THE 



SKETCH OF A GENERAL ARRANGEMENT 



NUDIBRA1NCHIATE MOLLUSCA. 



Order— NUDIBRANCHIATA. 



Sub-Order — Acanthobranchiata, Ferussac. 

 Branchiae on the medio-dorsal line ; skin spiculose. 



Fam. 1. Doridid^;. Cloak large, without marginal appendages; dorsal 



GEN. 



1. Doris. 



2. Chromodoris. 



Fam. 2. Polycerid^e. Cloak small or obsolete, generally with marginal 

 appendages; tentacles variable; mouth occasionally provided 

 with jaws 



tentacles 2, retractile within cavities; oral tentacles 2, various \ 3. Lamellidoris. 

 or wanting . . . . .4. Hexabranchus. 



5. Acanthodoris. 



6. Goniodoris. 



7. Idalia. 



8. Ancula. 



9. Polycera. 



10. Thecacera. 



11. Triopa. 



12. Euplocamus. 



13. Plocamophorus. 



14. iEgirus. 



15. Ceratosoma. 



Sub-Order — Polybranchiata, Ferussac. 



Branchiae arranged along the sides of the body; skin generally without spicula. 



Tribe 1. Liver generally central ; branchiae laminated. 



Section 1. With the branchiae on the under side of the cloak. 



Fam. 3. Phyllidiad^:. Cloak large, spiculose ; dorsal tentacles 2, retrac- ~\ 



tile within cavities in the cloak; oral tentacles 2; anus C ' ' # 



\ 17. Frveria. 

 postero-dorsal ; mouth without jaws . ) 



Fam. 4. Diphyllidiad^e. Cloak large ; dorsal tentacles 2, situated in ^ 



front of the cloak, with a veil above the head ; anus lateral ; I 



digestive organs with a rudimentary gastro-hepatic system ; i 



mouth with jaws . . . .J 



18. Diphyllidia. 



