APPENDIX. 643 



Shell quite hidden by the mantle, half ovate, solid, with a 

 thin, horny, more or less expanded edge. 



Syn. Clypeicella, Valeric. Mss. Viquesnelia, Desk. 

 Ex. M. Dusumieri, Valenciennes. 



Genus LACONIA, Gray. 



Body sub-globose. Mantle edged, produced in front, forming 

 a broad collar. 



Shell sub-globose, entirely and permanently covered by a thin 

 expansion of the mantle ; spire of few whorls, the last very large; 

 aperture very large, lunate. 



Ex. L. Ferussaci, Gray, pi. 138, fig. 7. 



Only known by Ferussac's figure (Gray). 



Genus blauneria, Shuttleworth. 



(Sub-fam. MELAMPINiE.) 



Shell impel forate, oblong-turreted, thin; aperture narrow, 

 elongated ; inner-lip with a single plait, columella sub-truncate ; 

 outer-lip simple, straight. 



Ex. B. pellucida, Pfeiffer (Cubensis, Pfeiff), pi. 138, fig. 8. 



The observations of Dr. Gundlach have shown that the animal 

 of this genus has the characters of Ellohium and not of Oleacina, 

 to which genus we had referred, it, judging from the shell only. 



Vol. ii. p. 242. Genus CARYCHIUM. 



Sub-gen. zosrEUM, Bourguignat. 



Shell pupiform, umbilicated ; spire obtuse. C. lautum, obesum, 

 Schmidti, and spelaum are examples. 



The members of this group are met with in caverns and other 

 places from whence the light is excluded. M. Bourguignat in 

 consequence supposes that they are without the usual organs of 

 vision. 



