VELUTINID^:. 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 (Duminy, fide Requien) ; 

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

 (Philippi); Adriatic (v. Schrockinger); J^gean (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'Andrew, who dredged a living specimen at Mo- 

 gador, 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 Iv 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. VELUTINID^, Gray. 



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

 form a short branchial canal : snout or mentum 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 ; pleurae consisting 

 of 3 claw-shaped and similar uncini, 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. 



