AMERICAN" SPECIES OF ORTHOPHKAGMINA AND LEPIDOCYCLINA. 



79 



torial chambers very small near the center, 

 gradually uicreasmg m size toward the periph- 

 ery, where they become mxiltiple instead of 

 single, as is usually the case, and make three 

 or four vertical series, each with numerous fine 

 apertural pores on the outer convex wall. 



The horizontal section shows the mcrease 

 in size of the equatorial chambers, which to- 

 ward the center seem hexagonal and toward 

 the periphery almost rhomboid, with the outer 

 half convex. 



Of somewhat similar character in respect to 

 the duphcation of equatorial chambers are 

 L. multipartita (Martin), from Java, and L. 

 insulse natalis var. inequalis (Jones and Parker), 

 from Christmas Island. 



Type specimen, U. S. N. M. catalogue 

 No. 324742. Specimens were very abundant, 

 weathered out of an orbitoid limestone, 2 

 miles north of David, Panama; D. F. Mac- 

 Donald, collector. They occur also with other 

 species of Lepidocyclina at station 6586e, near 

 the mouth of Tonosi Eiver; D. F. MacDonald, 

 collector. 



Lepidocyclina kempi (O'Connell) Cushman. 



Orbitoides hempi O'Connell, Am. Inst. Min. Eng. Trans., 

 vol. 51, p. 13, figs. 5, 6, 1916. 



Under the name Orbitoides Jcempi Miss 

 O'Connell figured sections from a limestone 

 quarry at Arroyo Seboruco, 12 miles from 

 Felton, Cuba. Although the description is 

 not very clear,' the figured section (fig. 5) 

 shows the species to belong to the genus 

 Lepidocyclina. Measurements given are, total 

 diameter, 7+ millimeters; central thickness, 

 2.5 millimeters. The general characters that 

 can be made out from the description and 

 figures would seem to indicate that it may very 

 probably be L. inarginata (Michelotti) . This 

 suggestion is strengthened by the fact that in 

 figure 6 appears a vertical section, very evi- 

 dently of L. sutnatrensis Brady, a species, so 

 far as seen in the Cuban material I have 

 examined, occurring with L. marginata in four 

 out of eight stations. I have refrained from 

 placing this definitely as a synonym of L. 

 inarginata until specimens are available for 

 comparison. 



