PLATE 39. 
Fic. 1. MICHILINIA? PLACENTA.........----.-- bo HEds 655 45 coer nee ete 
a. Calycular view of a large example; natural size. 
b. Lateral view of the same. 
c. Calycular view of a small example; natural size. 
d. Under side of the same, showing the concentrically wrinkled 
epitheca. 
MTG 2! MICHTLINIA. EX PANGAS os clemoee ee nee Ser ariascer ea cies ceee peti, ee 
a. Calycular view of a small, imperfect, silicified example; natural 
size. 
b. Lateral view of the same. 
Fig. 3. CHONOPHYLLUM SEDALIENSE- woe cee ce ences fee ee eee ee ee eee eee nee- 
a. Side view of a partially crushed and broken example; natural size. 
BiG 4, LOPHOPHYLEUMIEXPANSU Mia eee ee eee sac cnn colsisisic Sse winemiseice 
a. Side view of a type specimen; natural size. 
b. Calycular view of the same. 
The spots near the columella are accidental; and the figure does not 
show the full prominence of the columella. 
Pre: /5. HADROPHYLLUM: GLANS aus ieee oe ieai cis oie eie come ciemecibiemeestenen 
a. Calycular view; natural size. 
b. Lateral view of the same. 
BIG. 6: ZAPHRENTIS( CALCH OTAy eae eee eae a nets ate esie os aie sia recta eee wr ey cee 
a. Lateral view of a specimen from Sedalia, Mo.; natural size; show- 
ing a minimum degree of flattening upon the lower portion of 
the convex side. 
b. Calycular view of the same. The edge of the calyx of this speci- 
men is constricted, giving it the appearance of being thickened. 
It is usually thin and sharp. 
c. View of the convex side of another example, from Burlington, 
Iowa, showing a maximum degree of flattening of the lower 
portion of the convex side. 
d. Calycular view of the same, showing the border of the usual 
character, except that its lower portion has been broken away. 
RIGS. (ZAPHREN TIS! BLEEP TIC AG so see eee ee ey ese Soho tcae le 5) ucts a Cre See 
a. Side view; natural size. 
b. Calycular view of the same. 
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