82 DORIDIDJE. 



2. G. casta'nea, Alder and Hancock. 



G. castanca, A. & H. in Ann. N. H. 1st ser. xvi. p. 314 ; and Brit. Nud. 

 Moll. fain. 1, pi. 19. 



Body ovate, tapering obtusely behind, reddish -brown spotted 

 with white, the sides strongly tuberculated : mantle very 

 small, somewhat tuberculated, with a waved and reflected 

 margin, and a strong pale ridge down the centre : dorsal ten- 

 tacles stout, broadly laminated : oral tentacles broad, flat, and 

 angulated, each terminating in a rather pointed apex : gills 

 6 or 7, tripinnate, large and spreading, rather darker- coloured 

 than the body : foot large and broad. L. 1. 



Habitat : Under stones near low- water mark ; rare. Sal- 

 combe Bay (Alder) ; Falmouth (Cocks) ; Saltcoats, Ayrshire 

 (D. Landsborough, jun.). 



The Doris Paretii of Yerany, found by him [at Nice] near 

 Genoa,, is synonymous with this species [?]. Mediterranean 

 specimens are of larger size, reaching nearly an inch and a 

 half in length. 



Family II. DORI'DIDjE. 



Mantle large, spiculose, entire, without marginal appendages : 

 dorsal tentacles retractile within cavities : mouth with a denti- 

 culated prehensile tongue or odontophore. 



Genus DORIS [*], Linne. 

 [PI. III. f. 4.] 



Body ovate or elliptical, generally more or less depressed : 

 mantle covering the head and foot : dorsal tentacles clavate or 

 conical, laminated, and retractile within cavities, sometimes 

 slightly sheathed : oral tentacles variable, sometimes replaced 

 by a veil : gills plumose, placed posteriorly on the median line 

 of the mantle and partially or completely surrounding the vent. 



The genus Boris is very generally diffused over the globe, 

 and contains numerous species; those of tropical climates 

 grow to a large size, and are often of very brilliant colours. 

 The British species comprise three sections. 



* [Daughter of Oceanus and wife of Nereus.] 



