220 HELICIDyE. 



Bay (J. G. J.) . This variety is the H. rotunclata of Tiir- 

 ton's ' Conchological Dictionary/ Var. 4. Bucks^ Surrey, 

 Kent, Essex, Oxon, Gloucester, Somerset, Salop, York, 

 Northumberland, Aberdeen, Glamorgan, and most pro- 

 ])ably other counties ; but it is rare. This common 

 species ranges from Russia and Finland to Sicily and the 

 Azores. 



This pretty little shell reminds one of a Solarium or 

 of the Trochus perspectivus. The animal is exceedingly 

 shy; and Miiller relates that he spent two hours in 

 watching one of them, before it made its appearance, 

 although he took every precaution not to alarm the little 

 creature. It appears not to be prolific. According to 

 Bouchard- Chantereaux, it only lays from 20 to 30 eggs 

 in the course of the breeding-season, viz. from May to 

 September. It secretes a very thin and transparent 

 epiphragm. 



It is the H. radiata of Da Costa and Montagu. Some 

 authors have erroneously placed this and the two follow- 

 ing species in the genus Zonites ; but the textui-e and 

 aspect of the shells, as well as the arrangement of the 

 teeth, show that they belong to the present genus, and 

 not to Zonites. 



20. H. rupes'tris^, Studer. 



H. rwpeat.Tis,, Draparnaud, Tabl. Moll. p. 71. H~ imihilicata, F, & H. iv. 

 p. 81, pi. cxxi. f. 7. 8. 



Body dark slate-colour, with sometimes a reddish tinge, 

 covered with minute depressed tubercles : mantle dusky 

 brown, indistinctly speckled with black : tentacles diverging, 

 dark-grey ; upper pair thick and almost cylindrical, with 

 nearly oval bulbs, which are about a fourth of the size of those 

 tentacles ; lower pair almost rudimentary and nearly black, 

 not more than a twelfth of the size of the other pair : foot 



* Inhabiting rocks. 



