NO. 10 AMERICAN SPECIES OF LEPIDOCYCLINA — VAUGHAN 43 



LEPIDOCYCLINA sp. indet. b 



Plate 23, figs. 4, 5 



The following notes are based on the examination of two vertical 

 sections. Without additional material, it would not be advisable to 

 name this form specifically, although it probably represents a new 

 species. 



Test lenticular, with a wide, sharply demarked, very thin marginal 

 rim, which in one specimen attains a width of 0.63 mm. The more 

 complete specimen has a diameter of 2.09 mm and a thickness of 0.57 

 mm. The other, in which the marginal rim is missing on one side, has 

 a diameter of 1.52 mm and a thickness of 0.65 mm. 



Embryonic chambers unknown. 



The lateral chambers form regular tiers, each with 5 or 6 chambers, 

 on each side of the equatorial layer. Their number decreases to the 

 inner edge of the marginal rim, which is entirely composed of equa- 

 torial chambers. The lateral chambers at the periphery of the um- 

 bonate area have a length of 80 ju. and a height of about 40 fx in one 

 specimen, a length of 70 p. and a height of about 30 /a in the other. 

 The floors are moderately thick and noticeably arched. The equatorial 

 layer is about 40 /a thick at the center, increasing to 75 /a at the outer 

 edge of the rim. The equatorial chambers have a radial diameter of 

 about 30 IX at the center and of about 70 /t at the periphery. 



Pillars are well developed in the umbonate portion of the test and 

 have a diameter ranging from 60 to 90 fi. These would form a group 

 of rather pronounced papillae on the surface of the test. 



Locality and geologic horizon. — About f mile east of Ocujal Spring, 

 and about 4f miles due east of Monument H6 on the east boundary 

 of the U.S. Naval Reservation at Guantanamo, U.S.G.S. locality, 

 no. 7513, O. E. Meinzer, collector. Middle Oligocene. 



LEPIDOCYCLINA sp. indet. c 

 Plate 23, figs. 6-8 



Three vertical sections form the basis of the following notes. The 

 material, however, is not sufficient for an adequate specific characteri- 

 zation. 



Test compressed lenticular, with a narrow marginal rim. The 

 diameter ranges from 3 mm to 5.5 mm and the thickness from 0.80 

 mm to 1.5 mm. 



Embryonic chambers unknown. 



