22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



The equatorial layer is very thin, nearly uniform in thickness, 

 about 30 to 40 fi; chamber cavities are elliptical, about 24 /x high 

 and about 26 ju long ; thickness of roofs and floors about 8 to 10 /a. 



Lateral chambers in vertical section are small and have arched 

 roofs. There are about seven to eight layers of lateral chambers on 

 each side of the equatorial layer over the center, and these are not 

 arranged in definite tiers. The number of tiers decreases toward 

 the periphery, which is not covered by lateral chambers. This un- 

 covered portion of the equatorial layer has a width of about 1.5 mm, 

 and a thickness of about 30 /x. Height of chamber cavities varies 

 from 8 to 10 /t ; length varies from 20 to 30 /* ; roofs and floors about 

 6 fx thick. 



Locality and geologic JiO)'ison.— Locality 1142, Paraiso series, 

 middle Eocene. This species is fairly abundant and is associated 

 with a few poorly preserved specimens of an indeterminable species 

 of Camerina. 



These specimens resemble DiscocycUna Hintensis (15, p. 44, pi. 9, 

 figs. 3-6) from the Brito formation of Nicaragua (U.S.G.S. station 

 6408). Their poor preservation makes specific determination im- 

 possible. Better material may show this to be a new species. 



Gorter and Van der Vlerk (25, p. iii, pi. 16, figs. 5-6) identify 

 what are probably better-preserved specimens from locality 1142 as 

 DiscocycUna flintensis Cushman. 



Subgenus ASTEROCYCLINA Giimbel 



DISCOCYCLINA (ASTEROCYCLINA) ASTERISCA (Guppy) Vaughan 



Cisseis asteriscus Guppy (26, p. 584, pi. 25, figs, ipa-b). 



Cisseis asteriscus Guppy, Hodson (27, pp. 11-13, pl. 2, figs, i, 2, 10). 



DiscocycUna (Asterocyclina) asterisca (Guppy) Vaughan (62, p. 3). 



Material collected by H. G. Kugler and L. Vonderschmitt from 

 locality 163, Venezuela, contained four broken specimens of this 

 species. Rock sections of material from localities 12, 148, 163, 1149, 

 and 1 162 contain sections of this species. Fragments of Asterocyclina 

 occur at locality 11 52. These may possibly be D. (Asterocyclina) 

 asterisca (Guppy). 



This species is associated with L. (Lepidocyclina) trinitatis H. 

 Douville, Camerina sp. cf. C. parvula (Cushman), D. (Asterocyclina) 

 kngleri, Gravell, n. sp., Operculina sp. cf . O. cookei Cushman, Gypsina 

 vesiciilaris (Parker and Jones), and Car pent eria sp. 



