AMERICAN SPECIES OF ORTHOPHRAGMINA AND LEPIDOCYCLINA. 



75 



showing one or two accessory chambers also 

 thick walled and rather conspicuously per- 

 forate; young specimens show that for a time 

 the embryonic chamber is the greater part of 

 the test; equatorial band of chambers rather 

 large, even at the beguining, the outer wall 

 convex and coarsely perforate; lateral chambers 

 comparatively thick walled, several times as 

 broad as high, somewhat lenticular in section, 

 highest in the middle, thence tapering toward 

 the sides; a comparatively small number of 

 pillars in the central part originating in the wall 

 of the embryonic chamber and extending to 

 the surface. 



The horizontal section shows the equatorial 

 chambers regularly hexagonal, fairly thick 

 walled, those of various annuli of very differ- 

 ent sizes. 



Diameter as much as 9 millimeters, maximum 

 height 3 millimeters or more. 



The type locality for this species is U. S. G. S. 

 station 7513, orbitoidal limestone, outcrop 

 where Palmer trail joins Ocujal trail, Cuba. 

 Specimens are also numerous in material from 

 stations 7512, Ocujal; 7519, orbitoidal lime- 

 stone from drift near top of landslide next 

 north of Los Melones; 7521, limestone at top 

 of Mogote Peak. 



This is a very heavy, thick-walled species 

 throughout, and in section may be easily dis- 

 tinguished from any of the other Cuban or 

 West Indian species. 



Lepidocyclina canellei Lemoine and R. Douvill§. 



Plate XXXII, figures 1-5. 



Lepidocyclina canellei Lemoine and Douville, Soc. geol. 

 France, Paleontologie, Mem. 32, p. 20, pi. 1, fig. 1; 

 pi. 3, fig. 5, 1904. 

 Cushman, U. S. Nat. Mus. Bull. 103, p. 91, pi. 34, 

 figs. 1-6, 1918. 



Test comparatively small, diameter of largest 

 specimens sHghtly less than 4 millimeters, 

 thickness a little more than one-fourth the 

 diameter; circular in outline, central portion 

 somewhat raised and evenly rounded, near the 

 periphery flattened or even slightly concave; 

 surface in well-preserved specimens finely 

 granular or even finely papillate but not 

 strongly so, often appearing smooth to the 

 unaided eye. In worn specimens the surface 

 appears as a series of regular hexagonal, honey- 

 comb-like reticulations due to the edges of the 

 lateral chambers. 



In vertical section the lateral chambers are 

 seen to be arranged in vertical columns, one 

 directly above another, from the equatorial 

 chambers to the surface, about 12 chambers 

 in each vertical column in the central region, 

 the lateral walls hardly thicker than the upper 

 or lower surfaces. Chamber of adjacent col- 

 umns arranged alternately; no distinct coliunns 

 present. Equatorial chambers gradually in- 

 creasing in size toward the periphery, single 

 throughout, extending peripherally beyond the 

 lateral chambers and in surface view in well- 

 preserved specimens appearing as a hexagonal 

 reticulation. Embryonic chambers nearly 

 equal in size, nearly semicircular in section, 

 their common wall straight. 



The horizontal section shows the equatorial 

 chambers regularly hexagonal ; those toward the 

 periphery the largest. Embryonic chambers 

 similar to those shown in the vertical view. 



Lemoine and R. DouviUe described and fig- 

 ured this species from Penablanca, Panama, 

 and also noted it from Martinique and Angola. 

 The material from Panama recorded by DaU 

 and by Bagg ^ as Orbitoides forhesi Carpenter 

 (catalogue No. 135216, U. S. N. M.) is Lepidocy- 

 clina canellei Ijemoine and R. Douville. Figures 

 1, 3, 4, and 5 in Plate XXXII are from mate- 

 rial collected by Hill at Bohio, Panama, where 

 it is very abundant. This is the same station 

 as 6027 of Vaughan and MacDonald (orbitoidal 

 marl, a quarter of a mile northwest of Bohio 

 railroad station) . In this material L. canellei is 

 very abundant and makes up a considerable 

 proportion of the marl. 



Specimens in the collection of the U. S.N. M. 

 (catalogue No. 107158) from the Oligocene of 

 of Trinidad (Leda bed, Naparina), collected by 

 Guppy, are also very evidently Lepidocy- 

 clina canellei. 



Specimens of L. canellei were very abundant 

 at station 6891, foraminiferal limestone at 

 Balamonas, Canal Zone, where they were col- 

 lected by D. F. MacDonald. 



A limestone at station 6892, 450 feet south 

 of switch at Mamei, Canal Zone, contains nu- 

 merous specimens also collected by MacDonald, 

 of a Lepidocyclina which in general shape in 

 section resembles L. canellei, but the material 

 is very cherty and the finer structure is not 

 well preserved. 



1 Hill, R. T., The geologic history of the Isthmus of Panama: Harvard 

 Coll. Mus. Comp. Zool. Bull., vol. 28, pp. 272, 275, 1898. 



