26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



This species is abundant. It is associated with D. (Asterocyclina) 

 kugleri n.sp., D. (Asterocydina) asterisca (Guppy), L. (Lepido- 

 cyclina) trhiitatis H. Douville, and Car pent eria sp. 



The indicated horizon is upper Eocene. L. (Lepidocyclina) mac- 

 donaldi also occurs in Panama and Jamaica. 



LEPIDOCYCLINA (LEPIDOCYCLINA) TRINITATIS H. Douvill6 



Plate 3, figs. 7, 8 



Isolepidina pustulosa H. Douville (21, p. 844, fig. 3, nol fig. 4). 

 Isolepidina trinitatis H. Douville (22, p. 34, pi. i, text figs. 7-9). 

 Lepidocyclina {Lepidocyclina) trinitatis Hodson {2y, p. 19, pi. 4, fig. 10). 

 Lepidocyclina {Lepidocyclina) friiiilatis Vaughan (47, p. 797. 57, p. 289, pi. 49, 



figs. 10-13). 

 Lepidocyclina {Lepidocyclina) trinitatis Gorter and Van der Vlerk (25, pp. 107- 



108). 



Test small ; shape variable, gloljular to umbonate. In the umbonate 

 forms the flange ranges in development from a mere vestige to a 

 rim occupying over one half the diameter of the test. The central 

 thickened area is covered with pustules which decrease in size toward 

 the flange, absent on the outer margin of flange. Diameter of test 

 about I to S mm ; thickness about i to 2 mm. 



Embryonic apparatus composed of two equal to subequal chambers, 

 whose greater diameter is about 480 to 540 /* and lesser diameter 

 about 350 to 420 fi. On each side of the junction of the embryonic 

 chambers there is in many specimens a crescent-shaped chamber 

 which is larger than the succeeding equatorial chambers. Vertical 

 section shows the embryonic apparatus to be about 480 to 540 jx long 

 and about 320 jx high ; walls about 20 fi thick. 



Equatorial chambers have rounded outer walls and pointed inner 

 ends, largest at the center, with a radial diameter of about 100 fi; 

 tangential diameter about 80 /x. Equatorial chambers decrease in size 

 toward the periphery, where the radial diameter is about 64 /* and 

 the tangential 50 /x ; walls about 20 /x thick ; roofs and floors per- 

 forated by evenly distributed pores with a diameter of about 2 ft. 

 Height of equatorial layer near center about 120 /x; height at a point 

 1.5 mm from the center about 240 /x; thickness of the roofs and 

 floors about 25 /x. 



Lateral chambers arranged in tiers of 5 to 12 layers over the center 

 on each side of the equatorial layer, decreasing in number toward 

 the periphery where the equatorial layer is not covered by lateral 

 chambers. The length of the lateral chambers ranges from 80 to 

 200 [x, longest over embryonic apparatus near the surface of test ; 



