/UNITES. 



153 



differs in several particulars. Besides this, it has reeeivcd a 

 number of names, of which the following are most important : 

 Jf. tit rid tula, Gray; H. nitidoxa, Fer. ; IL_ electrina, Gould 

 (American specimens), and H. viridula, Menke, possibly'. H. 

 Hammonis, Strom., is the name adopted by Pfeiffer for this 

 species, but its identification is doubtful. Dr. Gwyn Jeffreys calls 

 the American form var. albux, but if entitled to varietal distinc- 

 tion it should bear Gould's name. 



H. COURQUINI, Bourg. PI. 49, figs. 1-3. 



Perviously umbilicated, depressed, scarcely convex above, 

 semipellucid, shining, smooth or very slightly striulate, light 

 corneous; whorls 5, suture impressed, last whorl compressed- 

 rounded, narrow, lip darker colored. Diam. 6 mill. 



Near Barcelona, Spain. 

 II. EXCAVATA, Bean. PI. 49, figs. 4, 5. 



Widely perspectively umbilicated, thin, pellucid, distinctly 

 striate. stria: 1 becoming stronger at the suture, smoother below, 

 orange corneous; whorls 5, convex, narrow, slowly enlarging, 

 last whorl scarcely wider than the penultimate, suture impressed. 



Diam. 5 mill. 



England, Sell leswig-Halstein. 



II. TRANSLUCIDA, Moi'tillet. 



Moderately umbilicated, almost discoidal, slightly striate, thin, 

 pellucid, shining, brownish ; whorls 5, more distinctly striate 

 near the impressed suture, the last whorl wider, base more con- 

 vex. Diam. 8 mill. 



Near Trebizond. 



The work in which this is figured is, unfortunately, not acces- 

 sible to me. 



II. PLANARIA, Ch'ssin. PI. 49, figs. 6-8. 



Narrowly umbilicated, almost discoidal, smooth, thin, diaphan- 

 lous. shining; whorls f>, regularly enlarging, with impressed 

 suture, last whorl not dilated, but double the width of the pen- 

 lultimate. Diam. fi mill. 



J <i If <t, (Jrimea. 

 |II. BLTDAIIENSIS, Bourg. PL 49, figs. 9-11. 



Widely umbilicated, planulate, fragile, pellucid, shining, ful- 





