-'''2 AMI'JIIBl'LIMA. 



Shell depressed, somewhat squarish oval, green, lint slightly calci- 

 lied. the eavity open beneath. Whorls not quite 2, the small spin- 

 lying on the right side rather far posteriorly. Length IS, breadth 

 in, height ."> mill. 



Hru.it (Taunay); Tijura, near Rio de Janeiro (von Ihering), on 

 a Laiiana. 



Parmacella palliolum FKKTSSAC, Prodr.. Tald. Syst. de la famille 

 do Liniaces p. '>:> (1821); Histoire, pi. 7 A, f. 1-9. Peltella paUio- 

 Iiun vox IIIKUIM,, Malak. Blatter (n. F.), viii, p. 57-Sl, pi. 3, 4 

 (anatomy); x, p. 1 68 ; Descripcoa c anatomia ila Peltella, in Archi- 

 vos do Mii.-eu Nacional do Rio de Janeiro, viii, 1892, pp. 135-153, 

 pi. 7, 8. 



The open spiral of the shell is similar to those of GryptOStrakon 

 and Gratis. The species }.. known from the original account by 

 Feruac, and an excellent anatomical description by Dr. H. von 

 Ihering. 



Genus CRYPTOSTRAKON W. G. Binney, 1879. 



i 



Cryptostrdbni AY. G. B., Annals of ihe New York Acad. of Sci., 

 i, p. >:>* ; iii, p. 101. Type C. gnbbi W. G. P.. 



Cryptostracon FISCIIKR, Manuel, p. 469. TKYON, Man. of Conch. 

 (2), i, pp. 233, 249. 



See Tryon, Manual of Conchology, i, p. 249. 



In this >lug the shell agrees with Pelt<-ll<t and daotis. It is said 

 to lie wholly enclosed, but this may possibly be erroneous. The jaw 

 i> described a> .-olid with a few stout ribs ; and the radula is de- 

 cidedly of Ilelicid type, being that of a ground snail. There is thus 

 no question thai Cryptostrakon dill'ei-s generically from I\>lt<'ll<i and 

 Gffntis, and the probabilities are that it groups with \ntlui>/.r 

 f Fischer and Crosse) and Mi-l<islrnrt>n ( Pil>bry, IS'.)'.)), rather than 

 witli the preceding Bnlimnlid genera. This can only be determineil 

 by an examination of the genitalia. 



Genua AM PH 1 1',1'LIMA Lamarck, isnr,. 



Amphlbulima L\M.. Annale> du Mii-c'iiin d'llistoire Natnrelle, vi, 

 p. .".(i 4 (for .1. i-in-iilliiiii, A. sni'i'i/im, .1. nlilninjd}. BKCK, Index 

 .Mi'll. p. '.'s (for A. ii/n/iilt, r/tii/ii/Ki, tii/riini, /Kititlu, rubescenSj mnri-n. 



). (!l:.\^. P. '/.. S., 1S17, p. 171 (type . I. ,-//,-////nfn). Ani- 

 (\\:\\, S\inip>. Brit. Mns., 1 S ('_', p. '.(. 



