62 AIOLOBRANCHIATA. 



Genus ANCULA, Loven. 



Body slender, with clavate processes bordering the branchial 

 region of the back. Tentacles clavate, perfoliate, laminated, 

 armed at the base with styliform appendages. 



Syn. Miranda, Alder and Hancock. 



Ex. A. cristata, Alder and Hancock, pi. 64, fig. 4. 



In this genus a number of elongate, digitate appendages 

 surround the gills; the tentacles are bent backwards 

 and are clavate, with the clubs lamellar ; the forehead is 

 simple, and there are curious styliform processes at the 

 base of the tentacles. The only species known is found on 

 the coasts of Britain and Norway. 



Sub-order AIOLOBRANCHIATA. 



Gills various, not arranged round the vent, but usually 

 in rows along the sides of the body. 



Fam. TEITONIID^E. 



Tongue broad; teeth, many in each cross series; jaws 

 horny. Tentacles retractile within sheaths. Gills superficial, 

 fusiform, or branched, on each side of the back. Vent 

 lateral. Foot linear, channelled. 



Many of the genera of this family are pelagic, and are 

 often found crawling on the fronds of floating algee, or 

 clinging to the narrow stems of gulf-weed, which is fre- 

 quently met with in large masses at considerable distances 

 from the land ; these mimic forests, tenanted by their sin- 

 gular Molluscan inhabitants, thus serve in some measure 

 to enliven the solitudes of the ocean. 



