PLATE XII. 



LAOTIRA CAMBRIA (p. 32). 



Fig. 1. Exumbrella surface of an elongate complex specimen in which 3 centers are developed. 



Figs. 2, 2a. Exumbrella and subumbrella surfaces of a specimen in which a tendency to fission is 

 developing on the left side. 



Fig. 3. Exumbrella surface of a complex specimen in which there is a tendency to fission of a por- 

 tion of the left side. 



Fig. 4. Exumbrella surface of a small complex specimen with 3 centers, from which lobes radiate 

 to the margin and to the opposing centers. A larger specimen of the same type ia shown 

 by fig. 1 of PL XIII. 



Fig. f> Worn section of a complex specimen of the type of fig. 9 of PL X. Traces of canals are 

 shown in some of the lobes. 



Fig. 6. Exumbrella surface with a portion of the lobes in strong relief. 



Fig. 6a. Subumbrella surface of fig. 6, showing terminations of some of the oral arms and lobes 

 of the exumbrella surface. 

 All figures natural size and reproduced from photographs. 



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