GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 101 



Plate 38. 



Lepidocyclina vaughani, new species. 



Specimen X 20, showing peripheral zone cut through the equatorial chambers 

 and central portion covered by lateral chambers. From limestone in cut of re- 

 located line of Panama Railroad opposite San Pablo and about 4 miles north 

 of Gamboa bridge (station 6673). 



Plate 39. 



Lepidocyclina panamensis, new species. 



Fig. 1. Very young specimen in vertical section consisting of embryonic cham- 

 bers and one or two following chambers, X 20. 

 2-4. Vertical sections with broad embryonic cha*mbers and showing the rela- 

 tion of equatorial and lateral chambers, vertical columns of lateral 

 chambers with intermediate pillars, X 20. 



5. Oblique section with zone of hexagonal equatorial chambers, X 20. 



6. Section of rock with six specimens lying closely adjacent, four of these 



cut through the embryonic chambers, X 20. 

 All specimens from near the mouth of Tonosi River, Panama (station 

 65S6e). 



Plate 40. 



Lepidocyclina macdonaldi, new species. 



Fig. 1. Exterior view of specimen, X 10, showing pillars appearing at the 

 surface as raised area. 

 2-5. Vertical sections (slightly oblique) through the embryonic chambers, 

 which when cut in plane at right angles to division wall show nearly 

 equal chambers with the division wall straight or very slightly 

 curved. Pillars evident, especially in Nos. 2 and 5. X 20. 

 6. Oblique section, X 20, showing zone of " lozenge-shaped " equatorial 

 chambers with lateral chambers on each side. The upper series 

 showing the cut sections of pillars. 

 All specimens from limestone 2 miles north of David, Panama (station 6523). 



Plate 41. 



Orthophragmina minima, new species. 



Fig. 1. Vertical section, X 20, showing general outline and numerous very fine 

 chambers. From white limestone in river bed above ice plant, David, 

 Panama (U.S.G.S. station 6512). 



Lepidocyclina duplicata, new species. 



2. Exterior view of type, X 5. showing raised center and depressed area 



inside the raised periphery. 



3. Portions of vertical section showing great increase in width of equa- 



torial zone, multiplication of chambers toward the periphery, heavy 

 pillars and wide lateral chambers. X 20. 



