PLATE exe 
LAOTIRA CAMBRIA (p. 32.) 
Figs. 1, 1a. A specimen having well-defined exumbrella lobes that may be compared with figs. 1 
and 10 of Pl. V. It differs in the introduction of some small irregular lobes. This 
difference is further shown in the subumbrella surface represented by fig. la. 
Fic. 2. Subumbrella surface having 4 principal lobes and several small, indistinct lobes. 
Fic. 8. Same type as fig. 2, with more robust lobes, and a large interradial lobe, «x. 
Fic. 4. Small specimen with slightly irregular subumbrella lobes. 
Fic. 5. Exumbrella surface of an irregular character. 
Fig. 5a. Subumbrella surface of fig. 5, in which the tendency to a transverse arrangement, shown 
in figs. 5a and 6a of Pl. IX, is developed into two centers connected by a transverse lobe. 
One of the oral arms is shown at x. 
Fiaes. 6, 6a. Exumbrella and subumbrella surfaces of a specimen in which the two surfaces cor- 
respond quite closely in arrangement. 
Fic. 7. A strongly convex subumbrella surface. 
Fic. 8. Subumbrella surface in which the lobes are arranged along a transverse, irregular central 
lobe. 
Fic, 9. Exumbrella or subumbrella surface; probably the former, showing the transverse arrange- 
ment of the lobes. 
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