PLATE V. 



LAOTIRA CAMBRIA (p. 32). 



Fig. 1. Subumbrella surface of an individual with 4 lobes. 



Fig. 2. Subumbrella surface of an individual with 4 lobes. The radial canal openings of the exuui- 



brella lobes are shown at x, x. 

 Fig. 3. A distorted specimen which has apparently 3 lobes. Owing to the great variation in the size 



of the lobes.it is probable that it is imperfect, the fourth lobe having been turned under 



and merged by pressure into the larger lobe. 

 Fig. 4. Subumbrella view of a small individual with 4 lobes. 

 Fig. 5. A 5-lobed specimen, the outlines of which have been obscured by the siliceous matter 



deposited about it. 

 Fig. 6. Exumbrella surface of a specimen with 6 lobes. 

 Fig. 7. A common form of the exumbrella with 5 lobes. 



Fig. 8 A specimen in which the 5 lobes are compressed so as to give them a spiral appearance. 

 Figs. 9, 9a. Exumbrella and subumbrella surface of a rotund specimen. 

 Fig. 10. A large. 4-lobed individual, which is very much obscured by the siliceous matter deposited 



about it. 

 Figs. 11. 11a. Exumbrella and subumbrella view of a 5-lobed individual preserving some of the 



characteristics of Brooksella alternate!, as shown in PI. I, figs. 4, 4a. 

 Most of the specimens represented on this plate are more or less obscured by the siliceous 

 matter deposited about them. The extent of this deposition is shown in the transverse sections on 

 PI. XXIII. 



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