PLATE XV. 



Lepidocyclina hilli Cushman n. sp. (p. 60). 



Figure 1. Surface view of type specimen, X 5, from the Guallava sandstone of Costa Rica (U. S. N. M. No. 135220). 



Lepidocyclina undulata Cushman (p. 60). 



Figure 2. Portion of section showing the equatorial chambers, X 20, from lower bed at Hodges Bluff, Antigua, Lee- 

 ward Islands (U. S. G. S. station 6862). 



Figure 3. Similar section, X 20, from Rifle Butts, Antigua, Leeward Islands (U. S. G. S. station 6854). 



Figure 4. Vertical section, X 20 (U. S. G. S. station 6862). 



Figure 5. Rock specimen, natural size, largely made up of Lepidocyclina undulata (A) and L. favosa (B). Bluffs 

 on north side of Willoughby Bay, Antigua, Leeward Islands (U. S. G. S. station 6881). 



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