ACME. 307 



s 



The " Cyclostoma marmorea " of Capt. Brown appears, 

 from tlie description and figure in the 'Edinburgh Journal 

 of Natural and Geographical Science' for October 1829, 

 to be a specimen of C. elegans which had been worn 

 smooth by attrition. 



The C.ferrugineum of Lamarck was erroneously in- 

 troduced by Dr. Turton into the British fauna. It is a 

 native of the extreme South of Europe, and has not even 

 been found in France. 



Genus II. ACME *, Hartmann. 

 Pl.VIII. f. 9, 10, 11, 12, 13. 



Body elongated, always containable within the shell: ten- 

 tacles awl-shaped, without bulbs or swollen extremities : foot 

 narrow. 



Shell cylindrical, rather thin : wliorls gradually increasing 

 in size : spire long, but ending in a blunt point : mouth oval : 

 umbilicus straight: operculum oblong, homy and thin, vdth 

 an excentric spire. 



This singular genus of minute operculated land- shells 

 was first distinguished by Hartmann, and described by 

 him in the ' Neue Alpina ' of Steinmiiller for 1821 under 

 the name of Acicula. However, for some reason or other 

 which does not appear, Hartmann changed this name 

 for Acme, and redescribed the genus at considerable 

 length in the sixth volume of Sturm's ' Deutschlands 

 Fauna,' which was published also in 1821. Risso having, 

 as before stated, in 1826 used the name Acicula for 

 another genus with Achatina acicula as its type, and the 

 original founder having discarded it, there seems to be 

 no alternative but to adopt the second name given by 

 Hartmann to the present genus. It takes precedence of 

 a somewhat similar generic name(^cm««) which has been 



* Point. 



