222 systematic arrangement 



3. ?Nerea. 

 Teeth ? 



1. N. punctata, t. 203. f. 2. 



Fam. XV. DOTONID.E. 



Mantle obsolete. Tentacles two, simple, sheathed at the base, 

 retractile. Gills clavate, compound, muricated or tuberculated, set in 

 a single series on each side of the back. Vent lateral, dorsal. Jaws 

 none. 



1. Doto. 



Body elongate, subprismatic ; forehead with a small simple veil. 

 Tentacles two, dorsal, linear, retractile, with short wide trumpet- 

 shaped sheaths. Gills ovate, clavate, with whorls of tubercles, de- 

 ciduous, in a simple series along each side of the back. Foot linear. 

 Lingual band narrow, with a single central series of large spines. 



1. D. fragilis, t. 198. f. 3, 5, 7 ; Forbes fy Hanley, B.M. t. A.A.A. 



f. 4*. 



2. D. coronata, t. 198. f. 1, t. 199. f. 8, t. 208. f. 2 ; Voy. Bonite, 



t. 24*, anat. ; Forbes fy Hanley, B.M. t. A.A.A. f. 4. 



2. Melibe. 



Frontal veil large, funnel-shaped, fringed internally. Tentacles 

 small, retractile within long narrow trumpet-shaped sheaths. Bran- 

 chiae ovate, tuberculated. Lingual membrane ? 



J. M. rosea, Rang, Man. t. 3. f. 3. 



Fam. XVI. GLAUCID^l. 



Body elongate. Tentacles four, linear, simple, non-retractile. 

 Gill fusiform, arranged in a palmate form on extended footstalks. 

 Anus lateral. Penis spiral, lateral. Jaws distinct. Lingual mem- 

 brane narrow, with a single series of teeth. 



1. Glaucus. 



Head indistinct. Tentacles short. Branchiae compressed, taper- 

 ing, arranged on broad flattened footstalks. Foot very narrow, 

 rounded in front. Lingual membrane narrow, with a single central 

 series of plates, bearing a long stout spine and marginal denticles. 



1. G. radiatus. 



2. G. Atlanticug, t. 201. f. 3, t. 202. f. 4 • Voy. Bonite, t. 24*. 



f. 9-1 I, t. 24**. 



3. G. Draco, t. 202. f. 6. 



