PART II. 



HLLICIXJE. 



333 



Gonospira Sw. Spire perfectly cylindrical, of equal 

 thickness, the tip obtuse, with the whorls large ; aper- 

 ture oval ; lips thickened ; pillar with or without a 

 plait. 



G. polanga Desh. Lesson, Voy. pi. 8. f. 8. 



Megaspira Lea. Spire excessively long, of more than 



twenty volutions, and of nearly equal thickness ; the 



tip persistent, and slightly pointed; aperture rounded; 



outer lip thin ; pillar and inner lip with sharp plaits. 



M. elatior Spix. Test. Braz. 15. f. 1. 



Siphonostoma Guild. Spire excessively long, pointed, 

 but the upper portion deciduous ; aperture circular. 



spreading ; the lips united, and 

 adjoining whorl, (fig. 97. c, d.) 

 S. costata Guild, [fig. 97. c, d.) 

 fasciata. En. M6th. 461. f. 7. 



Helicella Feruss. Shell discoid, 

 but the body- whorl thick and 

 ventricose ; the spire very small 

 and sunk ; pillar none ; aperture 

 semicircular ; outer lip thickened; 

 umbilicus very wide. {fig. 98.) 

 pellis-serpcntis (^pr. 98.); also Fer. 

 Moll us. pi. 66. 73. 75. 77. 



detached from thi% 



