NO. lO AMERICAN SPECIES OF LEPIDOCYCLINA — VAUGHAN I5 



Excellent descriptions of this species have been published by several 

 authors. Figures are given in this paper in order to facilitate com- 

 parison with other species and to show variation from typical speci- 

 mens. L. canellei is closely related to L. parvula Cushman, the most 

 important difference being that pillars are absent in L. canellei, 

 whereas they are strongly developed in L. parvula. 



The maximum diameter of megalospheric specimens of L. canellei 

 is about 5 mm. The diameter of smaller specimens is as small as 2.5 

 mm or even less. These notes are on specimens, virtual topotypes, 

 from old Bohio Station on the old Panama Railroad. The locality is 

 now covered by the water of Gatun Lake. 



A dwarf variety of L. canellei occurs at Arbol Grande station, near 

 Tampico. Specimens from this locality are illustrated by plate 6, 

 figures 4 and 5. The diameter of these specimens is about 1.5 mm. 



The treatment that should be accorded these smaller specimens has 

 been perplexing. After considerable thought it has seemed to me 

 that they should be referred to L. canellei and designated as a small 

 or dwarf form. Another Canal Zone species, Lepidocyclina (Nephro- 

 lepidina) vaughani, is represented in Antigua by specimens smaller 

 than those at the type locality. 



Localities and geologic horizon. — The localities in the Canal Zone 

 and near Tampico have already been given. The species is widely 

 distributed in the Caribbean region, occurring, for example, in Jamaica 

 and Venezuela. The horizon is in the Oligocene, apparently both 

 middle and upper. 



LEPIDOCYCLINA (LEPIDOCYCLINA) PANCANALIS Vaughan and Cole 



Plate 6, fig. 6 



1932. Lepidocyclina {Lepidocyclina) pancanalis Vaughan and Cole, Journ. 

 Washington Acad. Sci., vol. 22, p. 510, figs. 1-9. 



This species, which has just been described by Vaughan and Cole 

 from U.S.G.S. locality no. 6025, Bohio Ridge, Panama Canal Zone, 

 has been identified in collections made in Antigua by W. R. Forrest 

 at Cocoanut Hall, in the upper stratified beds at Half Moon Bay, 

 and at southeast point. Long Island. Commonly associated with L. 

 pancanalis at these localities are specimens of L. parvula, L. imdosa, 

 and L. vaughani. The horizon in Antigua is in the Antigua forma- 

 tion, but it may be considerably above the base of the formation. 



