NO. lO AMERICAN SPECIES OF LEPIDOCYCLINA VAUGHAN 21 



regarding the equatorial chambers, a photographic illustration of 

 them is given on plate 24, figure 4. L. giraudi represents an extreme 

 development of the costulation of the surface. L. canellei, without 

 pillars and with very small papillae, stands at one end of the series ; 

 L. parvula occupies an intermediate position with gradation toward 

 L. giraudi, which stands at the other end of the series. 



Locality and geologic Jwrizou. — The type locality of the species 

 is Pointe IMacabovi, Martinique, and its immediate vicinity ; J. Giraud. 

 collector. H. Douville gives the horizon as " couches a Turritella 

 toniata, Aquitanien ou Burdigalien." My inclination is to refer the 

 horizon to the Oligocene, probably upper. 



LEPIDOCYCLINA (LEPIDOCYCLINA) YURNAGUNENSIS Cushman 



Plate II, figs. 1-4 



1919. Lepidocycliim canellei var. ytmrnguncnsis Cushman, Carnegie Inst. Wash- 

 ington Publ. 291, p. 57, pi. 12, figs. 7-8, text fig. 6. 



1926. Lepidocyclina ytirnagiincnsis Vaughan, Quart. Journ., Geol. Soc. London, 

 vol. 82, p. 391, pi. 25, figs. 2-6 (references and synonymy). 



As I gave a detailed description of this species in my paper above 

 referred to, it is necessary here only to make notes on variation and 

 to compare it with other species. In its general external aspect and 

 to some degree in vertical sections, L. yio'uagunensis resembles L. 

 canellei, and it was for these reasons that Cushman considered it a 

 variety of L. canellei. There are, however, two important differences. 

 The equatorial chambers in L. yurnagunensis are predominantly 

 diamond- or lozenge-shaped, not predominantly neatly hexagonal as in 

 L. canellei. In L. yurnagunensis there are pillars of varying degrees 

 of development. They may be weakly or strongly developed. Those 

 forms with strongly developed pillars grade directly into the variety 

 uiorganopsis, which will be described below. The largest specimen 

 represented by plate 11, figure 2, a part of Cushman's type material, 

 shows a few pillars. 



Localities and geologic occurrence. — The type locality is U.S.G.S. 

 locaHty no. 7548, the west side of Yateras River, about 2^ miles 

 south of Yuraguana, about 2 miles north of El Jique, near Guan- 

 tanamo, Cuba, collected by O. E. Meinzer. The species is found at 

 numerous localities in the vicinity of Guantanamo, where it is associ- 

 ated with Lepidocycliim favosa Cushman, L. gigas Cushman var., and 

 other middle Oligocene species. It is found in the limestone on 

 Cayman Brae. Cayman Islands, and in the Moneague formation of 

 Jamaica. It is a rather common, widely distributed species in the 

 Antillean middle Oligocene. 



