VELUTlNIDiE. 233 



Carubbare, near Rhegio (Philippi) . It inhabits all the 

 coasts of France (D'Orbigny pere and others); Vigo Bay, 

 4 f. (M f Andrew) ; Corsica (Dummy, fide Requien) ; 

 Algiers (Weinkauff) ; Mogador, 3 f. (M' Andrew) ; Sicily 

 (Philippi); Adriatic (v. Schrockinger); iEgean (Forbes). 



Although this pretty little shell is by no means rare 

 — indeed it is very common at Guernsey — the animal 

 has not yet been discovered. Through the kindness of 

 Mr. M f Andrew, who dredged a living specimen at Mo- 

 gadon I am fortunately able to describe the operculum. 

 For an account of the false operculum, which has misled 

 systematists as to the position of this genus, I would 

 refer to page lv of the Introduction to the first volume 

 of the present work. 



It is the Trochus rugosus of Brown, Delphinula triyo- 

 nostoma of Basterot, and D. minuta of D'Orbigny pere. 



Family XXII. VELUTI'NIDjE, Gray. 



Body semioval : mantle notched in front, or folded so as to 

 form a short branchial canal: snout or mentmn prominent: 

 proboscis retractile, issuing from a vertical slit in the middle of 

 the tentacular veil : tentacles widely apart, and separated by a 

 veil-like membrane : eyes on bulbs or tubercles at the outer 

 bases of the tentacles : foot oblong, double-edged in front : 

 gills double, formed of unequal-sized plumes (Cuvier, Bou- 

 chard-Chantereaux, and others ; " single," Clark): odontopliore 

 long, flat, and coiled ; rhachis 1 -toothed ; pleura? consisting 

 of 3 claw- shaped and similar unc.ini, or of a single very large 

 one. Sexes distinct. 



Shell ear-shaped : spire lateral, small, and very short : 

 mouth occupying nearly the entire base of the shell, and ex- 

 posing the interior of the spire. 



The use of the pallial notch or fold is to conduct water 

 to the gills. 



