216 



of the type of this genus from Vestiarius to Lineolata,a 

 liberty he has frequently taken in other genera, and 

 which is much to be regretted, as the number of Sy- 

 nonyms has already created very great confusion, and 

 led to many errors. 



Rotella lineolata Rotella suturalis 



rosea monilifera 



Rotella Javanica. 



4TR0CHUS. 

 TROGHUS SOLARIS. Lillll. 



Mawes Linrueus, plate 27, fig. 1, 5. 

 From this genus, as Linnaeus had constituted it, La- 

 marck has separated the genera Solarium and Rotella; 

 it however still remains a numerous and elegant fami- 

 ly. The shells are marine, their form conical, the spire 

 more or less elevated, the whorls angular, convex, some- 

 times thin and sharp; aperture transversely depress- 

 ed; the axis of the spire but slightly inclined: they 

 stand easily and almost entirely erect on their base, 

 which is flat and concave, (rarely convex, as in the Ro- 

 tella); when placed in that position, the aperture forms 

 an angle at the last whorl, exhibiting the lower part 



