96 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



MULTICYCLINA, new subgenus. 



Subgenus differing from typical Lepidocyclma in the equatorial 

 chambers which instead of being in a single series become complex 

 toward the periphery and may consist of several series. 



Type of the subgenus. — Lepidocyclma duplicates, Cushman. 



LEPIDOCYLINA DUPLICATA, new species. 



Plate 41, figs. 2-4. 



Test of medium size, 10 to 14 millimeters in diameter, very much 

 thickened in the umbonal region, usually the thickness about one-half 

 the diameter; without the flattened periphery the central portion 

 is subspherical, thinning rapidty toward the periphery, then thick- 

 ening again at the margin, which is often doubly plicate in the best 

 preserved specimens. Surface of the umbonal portion studded with 

 numerous fine papillae marking the surface terminations of the pil- 

 lars, peripheral portion nearly smooth. 



Vertical section showing the embryonic chambers as very small, 

 apparently microsphere in the specimens sectioned, appearing spiral 

 as is usual in the microspheric form. Lateral chambers numerous, 

 flattened or lenticular, the numerous pillars as wide as or wider than 

 the intermediate columns of chambers, especially in the central por- 

 tion, rapidly increasing in size toward the surface. Equatorial 

 chambers very small near the center, gradually increasing in size 

 toward the periphery where they become multiple 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. 



Horizontal section shows the increase in size of the equatorial 

 chambers which toward the center seem hexagonal and toward the 

 periphery almost rhomboid with the outer half convex. 



Of somewhat similar character as far as the duplication of equa- 

 toral chambers is the species described by Martin from Java, L. 

 multipartita (Martin), and the form described by Jones and Parker 

 from Christmas Island, L. insulae natalis, var. inequalis (Jones and 

 Parker) . 



Occurrence. — Type-specimen, U. S. National Museum, Catalogue 

 No. 324742. Specimens were very abundant, weathered out of an or- 

 bitoid limestone, at Station 6523, 2 miles north of David, Panama, 

 D. F. MacDonald, collector. They also occur with other species of 

 Lepidocyclina at Station 6586e from near the mouth of Tonosi River, 

 D. F. MacDonald, collector. 



