PLATE 34. 
Legend: hp. Hinge-plate. b. Dental sockets. 
c. Crura. s. Median septum. 
: t. Teeth. a. Adductor scars. 
r. Diductor scars. 
MERISTELLA, Hatt. 
Page 773. 
MeristTELia Levis, Hall. 
Figs. 1, 2. Dorsal and profile views of an average example. 
Fig. 3. A portion of the brachial valve, showing the subquadrate outline of 
the hinge-plate. x 3. 
Lower Helderberg group. Albany county, N. Y. 
MeristTELua BELLA, Hall. 
Fig. 4. The interior of a pedicle-valve ; showing the teeth, the deeply excavated 
muscular scar and the testaceous thickening which fills the pedicle- 
cavity except along the median line. 
Fig. 5. The hinge-plate viewed in profile from in front. X 3. 
Lower Helderberg group. Schoharie, N. Y. 
MeEgisTELLA LENTA, Hall. 
Fig. 6. A longitudinal internal view, showing the position and form of the 
jugum. 
Oriskany sandstone. De Cewville, Ontario. 
MeristELLA NASUTA, Hall. 
Fig. 7%. The interior of a brachial valve; showing the hinge-plate and muscular 
impressions. 
Figs. 8, 9. Dorsal and profile views of a large, strongly nasute example. 
Schoharie grit. Albany county, N. Y. 
MeristeLtLa Watcorti, Hall. 
Fig. 10. A view of the brachidium from the ventral side, a portion of the cones 
being omitted to show the jugum. 
Fig. 11. The brachidium viewed from the anterior margin; showing the normal 
form of the cones and jugum. 
Oriskany sandstone. Cayuga, Ontario, 
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