550 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Taenioxylon multiradiratum Felix was obtained at station 6523. 



The limostone exposed at these three stations, which are all near 

 one another, clearly belongs to one formation, and it seems to me 

 to be of lower Oligocene (Lattorfian) age. However, Doctor Cush- 

 man because of the presence of Orthophragmina minima inclines to 

 the opinion that it is of upper Eocene age. 



Lepidocycllna duplicata was collected in association with L. pana- 

 mensis at station 6586e, near Tonosi, in a bed I am considering of 

 middle Oligocene (Rupelian) age (see p. 555). 



CULEBRA FORMATION. 



The principal localities at which collections were made from the 

 Culebra formation were along the Canal from Miraflores locks to 

 Las Cascadas. The local sections are described in Doctor Mac- 

 Donald's article, pages 533 to 541 of this volume, and the position of 

 each is indicated on plate 154. The United States National Museum 

 station record numbers are 6009 to 6020c, as given at the column 

 heads in the following table. Stations Nos. 6024a, 6025, 6026, are 

 on the Panama Railroad, relocated line, and are platted on the map 

 (pi. 154). Station No. 6837, on shales in the lower part of the Culebra 

 formation, one-quarter of a mile south of Empire bridge, is not platted 

 on the map. . / 



The names of the specifically determined Mollusca from station No. 

 6019a-d, bed not identified, are taken from Brown and Pilsbry. 1 

 The specimens were obtained 65 and 85 feet below the "Pecten bed," 

 which is the basal bed of the Emperador limestone. There are five 

 of these species, only one of which, Turritella altilira Conrad, has been 

 also reported from the Gatun formation. The generic names of the 

 other Mollusca are mostly taken from my field notes. Doctor Mac- 

 Donald and I obtained in the Culebra formation within Gaillard Cut, 

 stations 6019a^/"and 6020&-C, specimens representing about 70 genera 

 of mollusks, but the species have not been identified. 



Orthaulax pugnax (Heilprin), collected by Doctor MacDonald at 

 station 5901 , 2 miles south of Monte Lirio, formerly known as Mitchell- 

 ville, was identified by Dr. C. W. Cooke. This is the same locality as 

 station No. 6026, on the Panama Railroad, relocated line. Litho- 

 thamnium vaughani, Nummulites panamensis ?, Lepidocycllna canellei, 

 and three species of corals were also collected at this locality. 



1 Brown, A. P., and Pilsbry, H. A., Fauna of the Gatun formation, Isthmus of Pan ama— II, Acad. 

 Nat. Sci. Phila. Proc. for 1912, pp. 502, 503, 1912. 



