NO. lO AMERICAN SPECIES OF LEPIDOCYCLINA VAUGHAN 2/ 



the umbo. The diameter of megalospheric individuals ranges from 

 2.0 mm to 4 mm, the thickness from i mm to 1.5 mm. 



The embryonic chambers are of nephrolepidine type, a larger 

 chamber partly embracing a somewhat smaller one. They are decidedly 

 large, but have relatively thin walls. The height of the larger chamber 

 in a vertical section is about 0.19 mm, width of the two chambers in 

 the equatorial plane is about 0.45 mm. The smaller chamber has a 

 length of about 0.3 mm and a width of about 0.22 mm. The larger 

 chamber has a length of about 0.46 mm. 



In plan the equatorial chambers are elongate-hexagonal, becoming 

 rather large as they approach the periphery. At the center their radial 

 diameter is 60 ix, transverse diameter, 40 /*. At the periphery the 

 radial diameter is about no /a, and the transverse diameter about 75 /x. 

 Near the center the equatorial chambers are about 40 /x tall and at the 

 periphery, about 135 /^ tall. There are 9 layers of lateral chambers 

 on each side of the equatorial zone in megalospheric forms. Most of 

 the lateral chambers are disposed in regular tiers, but some are inter- 

 rupted. The chambers directly over the embryonic apparatus have a 

 length of 40 /* and a height of 20 /a ; those at the periphery in the same 

 tier have a length of 187 /* and a height of 45 /x. 



Strong pillars, irregularly spaced, are present ; they taper very little, 

 being nearly of the same thickness throughout their length. Their 

 average diameter is about 75 /a. 



Localities. — Antigua, Hodge Hill, collected by W. R. Forrest, and 

 U.S.G.S. locality no. 6862, Hodge Point, collected by T. W. Vaughan. 



This species is nearly related to the one from Arbol Grande, near 

 Tampico, Mexico, here identified as L. toiirnoueri. The main dififer- 

 ence in the two species is readily seen in a comparison of the equatorial 

 section. L. tempanii has much more elongate equatorial chambers 

 than L. tournoueri. 



This species is named for Dr. H. A. Tempany, formerly chemist of 

 the agricultural station in Antigua, and now Director of Agriculture in 

 British Malaya. Dr. Tempany, while resident in Antigua, contributed 

 to the knowledge of local geology as well as to scientific agriculture 

 there. 



LEPIDOCYCLINA (NEPHROLEPIDINA) FRAGILIS Cushman 

 Plate 14, figs. 1-4 



1920. Lcpidocyclina fragilis Cushman, U.S. Geol. Surv. Prof. Pap. 125, p. 63, 



pi. 22, figs. I, 2. 

 1924. Lcpidocyclina (Ncphrolcpidina) fragilis Vaughan, Bull. Geol. Soc. Amer., 



vol. 35, p. 798, pi. 33, fig- 5- 



