KUNOIj. SV. VET. AKADEMIENS HANDLING AR. BAND 41. NIO 4. 



9 



1. Gills absent; anus lateral on the right side Fain. Doridoxidce. 



2. Gills surrounding the dorsal anus, 



a. nearly always retractile; anterior tentacles usually present, digitiform or 

 conical (Cryptobranchia) Fam. Dorididce. 



b. never retractile; tentacles lobe-shaped or replaced by a velum (Phanero- 

 branchia). 



+ . Pharynx without ingluvies; mantle-margin prominent or not, mostly 

 with cirri (Non Suctoria) Fam,. Polyceridce. 



+ f . Pharynx with an ingluvies at the upper side ; mantle-margin generally 

 prominent with or without cirri (Suctoria) Fam. Goniodorididce. 



C. Aeolidoidea (Cladohepatica): Heart in the median line; male and female porus ge- 

 nitalis united to one orifice; vagina with a receptaculum seminis only; liver rami- 

 fied ; no blood-gland; anus usually lateral; mandibulae present, lateral. 



L. The back with papilla 1 , enclosing the liver-lobes. 



a. Oral tentacles present; rhinophores without vaginae, not retractile; papillae 

 usually claviform or cylindrical, mostly with cnidocysts Fam. Aeolididce. 



b. No oral tentacles; rhinophores retractile within wide vaginae; cnidocysts 

 absent; papillae with rings of minute tubercles, in one series on each side; 

 foot with the anterior angles rounded; margin of the mandibulae smooth; 

 anus lateral; penis unarmed Fam. Dotonidce. 



2. The back without papillae; tentacles = broad side-lobes of the anterior part 

 of the head; back flattened or slightly convex; rhinophores with laminated 

 clubs, retractile within short sheaths ; radula oo . 1 . oo . 



a. Gills lamelliform on the under-side of the prominent pallial margin 



Fam. Pleurophyllidiidce. 



b. Gills absent Fam. Pleuroleuridaz. 



D. Blysoidea (Ascoglossa) : Heart and liver as in Aeolidoidea; male and female porus 

 genitalis separated; vagina with both spermatocyst and receptaculum seminis; 

 pharynx on the under-side with a sac, receiving the worn teeth : mandibular ab- 

 sent; ganglia 7, separated, connected by commissures. 



1. The sides of the back with leaf -like or club-like processes (Cirrobranchia) 



Fam. Hermceidce. 



2. The sides of the body forming broad lobes, containing the liver-branches 

 (Pterobranchia) Fam. Elysiidce. 



3. Body smooth, slug-like, without processes and lobes (Abranchia) 



Fam. Limapontiidce. 



K. Sv. Vol.. Aka.l. Han.11. Ban.l 41. NiO 4. 



