90 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



field is therefore practically unworked, and the description of our 

 species with accurate stratigraphic information is of prime impor- 

 tance, as they have been proved elsewhere to be of great use as index 

 fossils. 



The collections now in my hands represent the Canal Zone, the 

 West Indies, and Coastal Plain Province of the eastern and south- 

 ern United States. Excellent material was collected in the Panama 

 Canal Zone by T. Wayland Vaughan and D. F. MacDonald, and 

 is here presented as a beginning in the determination and figuring 

 of the American species. This "will be followed by papers on the 

 West Indian and Coastal Plain species which now, owing to the care- 

 ful collecting by Doctor Vaughan and his associates, are represented 

 by excellent suites of specimens covering broad ranges, both geo- 

 graphically and stratigraphically. As these are gradually worked up 

 there will be a mass of data which should be of excellent service in 

 the correlation of horizons where these groups are represented, even 

 in the absence of Mollusca and other groups of fossils. 



The systematic descriptions of the species of Lepidocyclina, Num- 

 mulites, and Orbitolites follow, together with that of a genus and 

 species believed to be new. 



LIST OF SPECIES AND THEIR GEOLOGIC OCCURRENCE. 



Lepidocyclina canellei Lemoine and Douville. Oligocene, Culebra 

 formation, stations 6019a, Gaillard Cut; 6023, Rio Frijol; 6027, 

 Bohio (old station) ; 6891 ; Bailamons; 6892, 450 feet south of 

 switch at Mamei. Also Oligocene of Trinidad. 



Lepidocyclina chaperi Lemoine and Douville. Oligocene, Culebra 

 formation, stations 6019/, Las Cascadas; 6025, Bohio Ridge 

 switch. 



Lepidocyclina vaughani, new species. Oligocene, Emperador lime- 

 stone, stations 6021 and 6673, near Caimito Junction; 6255, half 

 mile south of Miraflores Station. 



Lepidocyclina macdonaldi, new species. Oligocene, station 6523, 2 

 miles north of David. 



Lepidocyclina panamensis, new species. Oligocene?, stations 6512, 

 river bed, David; Oligocene, 65866 and 6587, near mouth of 

 Tonosi River; probably at 6010, near Miraflores Locks, and 

 6012a and 6012e in Gaillard Cut, in the Culebra formation; 

 doubtfully in the Emperador limestone, at station 6015, Empire. 



Lepidocyclina duplicata, new species. Oligocene, stations 6523, 

 2 miles north of David; and 6586e, near mouth of Tonosi River. 



Heterosteginoides panamensis, new species. Oligocene, Culebra for- 

 mation, stations 6011, Gaillard Cut; 6024a, Rio Agua Salud; 

 6025, Bohio Ridge switch. Emperador limestone, stations 6015, 

 6016, quarries at Empire. 



