SYNOPSIS. 



Gen. 3. Triopa, Johnston. Tentacles clavate, retractile within sheaths: cloak margined with filaments. 



T. clavigera, Mull. 



var. T. plumosa, Thomp. 



Sub-Family, Polycerince. Without distinct cloak. 



Gen. 4. JEgires, Loven. Tentacles linear, retractile within sheaths : body covered with very large 



tubercles. 



M. Maura, For. 



M. punctilucens, D'Orb. 



Gen. 5. Thecacera, Fleming. Tentacles clavate, with sheaths : head bilobed : branchiae with two or 



more lateral appendages. 



T. pennigera, Mont. 



Gen. 6. Polycera, Cuvier. Tentacles clavate, non-retractile : without sheaths : a veil over the head 

 bordered with tubercles or tentacular points : branchiae with two or more lateral appendages. 



P. quadrilineata, Mull. 



var. D. flava, Mont. 

 P. typica, Thomp. 

 P. ocellata, A. & H. 



var. Triopa Nothus, Johns. ? 

 P. Lessonii, D'Orb. (P. citrina, Aid.) 



Gen. 7. Idalia, Leuckart. Tentacles clavate or linear, with filaments at their base : head slightly lobed 

 at the sides : back with numerous branchial appendages. 



I. elegans, Leuck. 

 I. aspersa, A. & H. 

 I. quadricornis, Mont. 

 I. cristata, Aid. 



Fam. 2. Trjtoniadje. Branchiae laminated, plumose, or papillose, arranged down the sides of the 



back : stomach simple. 



Gen. 8. Tritonia, Cuvier. Tentacles 2, with branched filaments, retractile within sheaths : veil tuber- 

 culated or digitated : branchiae plumose, arranged in a single series on a ridge down each side of 

 the back. 



T. Hombergii, Cuv. 

 T. plebeia, Johns. 



var. T. pulchra, Johns. 



Fam. 3. Eolidid^e. Branchiae papillose or branched, arranged on the sides of the back : stomach 



branched^ 



Sub-Family, Melibmnce. Tentacles 2, with sheaths. 



Gen. 9. Dendronotus, Aid. & Hanc. Tentacles clavate, laminated, retractile within sheaths; front of 

 the head with branched appendages : branchiae branched, arranged in a single series down each 

 side of the back. 



D. arborescens, Mull. 



var. Tr. lactea, Thomp. 

 Tr. pulchella, A. & H. 

 D. felina, A. & H. ? 



