CHEMNITZIA. 239 



front, which appears to bo common to the genus, as we 

 have observed it in all the British species. The head is 

 seldom protruded beyond the shell, which being transpa- 

 rent, the animal can easily see through." Alder. 



In shell sand, rather rare on the Northumberland coast. 

 One specimen alive from the boats at CuUercoats (Alder). 

 Also dredged in the same province at Whitburn, by Mr. 

 Howse. Scarborough (Bean). Berwickshire (Dr. John- 

 ston). Exraouth (Clark). Herm, near Guernsey (S. H.). 

 Cork Harbour ; Bantry Bay ; Loch Fyne (Jeffreys) ; 

 Zetland (Barlee) ; several of the localities enumerated for 

 subulata, to which it is very nearly allied, may probably 

 belong to this form. 



CHEMNITZIA, Alcide d'Orbigny. 



Shell elongated, of many M'horls, ribbed in the direction 

 of its length, often spirally striated, surface not polished. 

 Apex of the spire with a persistent embryonic sinistral shell, 

 forming the summit. Aperture oblong or subquadrate, 

 peristome incomplete, thin but solid, columella usually 

 toothless, rarely with a plication, straight, or nearly so. 

 Operculum corneous, pyriform, marked by lines of growth, 

 and having the imperfect rudiments of a spiral nucleus 

 at one extremity. 



Animal with a broad head ending in a narrow bilubed 

 snout furnished with a retractile proboscis ; tentacula two, 

 triangular or ear-shaped, their inner bases connate or 

 nearly so ; eyes placed at the inner sides of the tentacula. 

 Tongue probably unarmed. Anterior and upper margin 

 of the foot furnished with a distinct fold, or mentum. 

 Foot triangularly lanceolate, short in proportion to the 

 length of the shell. Operculigerous lobe apparently simple 



