l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



LEPIDOCYCLINA (LEPIDOCYCLINA) PARVULA Cushman 

 Plate 7, figs. 1-5; plate 8, figs. 3-5; plate 9, figs. 1-4; plate 10, figs. 1-6 



1919. Lcpidocyclina parzntla Cushman, Carnegie Inst. Washington Publ. 291. 



p. 58, pi. 3, figs. 4-7. 

 1928. Lcpidocyclina aff. L. morgani Cole, Bull. Amer. Pal., vol. 14, p. 222, 



pi. 4, fig. 9 {not Lemoine and R. Douville, 1904). 

 19 JO. Lcpidocyclina parmda Cole, ibid., vol. 15, p. 125, pi. 18, figs. 4, 5. 



Cushman's original description of this species is as follows : 



Test lenticular, circular, central region thickened, gradually diminishing in 

 breadth toward the periphery, which has a thin flangelike border, surface fairly 

 smooth. 



Vertical section showing the general form of the species ; equatorial chambers 

 gradually increasing in size toward the periphery, where they may be 4 to 5 

 times as high as long; outer surface slightly convex, chambers of the central 

 region in section nearly square; lateral chambers 8 to 10 in a vertical column 

 in the central region, and thence gradually diminishing in number until near 

 the periphery there may be but a single layer of the lateral chambers, central 

 portion with definite pillars, largely confined to this region. 



Horizontal section shows the usual form of the equatorial chambers for this 

 genus, the embryonic chambers either subequal or with one slightly larger than 

 the other. In the section illustrated on plate 3, figure 4, a peculiar condition of 

 these chambers is shown, where the two embryonic chambers have a series of 

 chambers apparently coiled about them. This is an unusual character of this 

 genus. 



Diameter 5 mm. 



Type specimen (U.S.N.M. no. 328191) from U.S.G.S. station 6862, from lower 

 bed at Hodge's Bluff, Antigua, T. W. Vaughan, collector. It is very abundant 

 in material from certain layers at this locality. This species also occurs at station 

 6854, Rifle Butts, Antigua. 



The description quoted above is good, but more detail is needed 

 regarding some features and, as the species is stratigraphically im- 

 portant, it is desirable to have an account of its variation, stratigraphic 

 occurrence, and geographic distribution. 



The thickness through the center of tw^o cotypes ranges from a little 

 less to somewhat more than i mm, that is, from about one third to 

 one fifth the diameter. The pillars are variable in size on the same 

 specimen, ranging from 0.05 to 0.20 mm thick. 



The first variations that will be discussed here are those in size. 

 The cotypes, except one specimen, are megalospheric and, therefore, 

 are small, about 3 mm in diameter ; one cotype is probably micro- 

 spheric, and it is about 5 mm in diameter. Other microspheric speci- 

 mens from the type locality are between 6 and 7 mm in diameter, and 

 as the edges are broken, the original diameter was probably 8 mm 

 or even somewhat greater. The thickness is a little more than 2 mm. 



