PLATE XXIV. 
1. Testuflo ammon, Andrews ; shell (probably of a female) from right side, 
(1 a) from above, (1 b) from below: one-fourth nat. size. Fluvio-marine 
beds (Upper Eocene). [C. 9240.] 
ahd., abdoiiiinal sliield. 
an., anal shield. 
(Mitoplastral hone. 
Ep., epiplastral hone. 
fern., femoral sliield. 
'/(«., gular shield. 
hum., humeral .shield. 
Hy.p., hvoplastral hone. 
1 1 I/p. p., hypoplastral hone. 
n. 1-4, neural (vertebral) shields. 
K. 1-8, neural hones. 
nu., nuchal shield, 
nuchal hone. 
pect., ])ectoral shield. 
Ey., pygal hones. 
A’t/i/i., xiphiplastral hone. 
