PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER 697 
Genus TRIPLECELLA Wilson, 1932 
Triplecella Witson, Trans. Roy. Soc. Canada, ser. 3, vol. 26, sec. 4, p. 399, 1932. 
Examination of the type specimen of this genus indicates that it belongs to 
Cyclospira and is not a new genus at all. The type specimen is a single valve 
marked medially by a moderately wide sulcus. At about the middle of the valve 
a fold appears in the sulcus and widens anteriorly to occupy nearly all of the 
sulcus at the front margin. In anterior profile the flanks bounding the sulcus 
are narrowly convex and elevated slightly above the fold in the sulcus. Although 
the original description states that “only one valve is known which appears to be 
the pedicle valve,” comparison with the brachial valve of Cyclospira indicates 
that the sulcation and development of a fold within the sulcus so characteristic 
of Triplecella is identical to the folding in the brachial valve of Cyclospira. Cyclo- 
spira bisulcata occurs in the Coburg formation which is the horizon of Triple- 
cella. It seems evident, therefore, from exterior details, that Triplecella duplicata 
is actually a brachial valve of C. bisulcata. 
Suborder STROPHOMENOIDEA Maillieux, 1932 
Superfamily PLECTAMBONITACEA Cooper and Williams, 1952 
Family TAFFIIDAE Ulrich and Cooper, 1936 
Shallow concavo-convex Strophomenoidea having a pseudodeltidium and chili- 
dium ; brachial valve with cardinalia like those of the Orthidae, with or without 
a cardinal process. 
Genus TAFFIA Ulrich, 1926 
Tafa Ulrich in Butts, Alabama Geol. Surv. Special Rep. 14, p. 99, pl. 18, figs. 13-17 
(no description), 1926.—ULricH and Cooper, Geol. Soc. Amer. Special Pap. 13, p. 180, 
1938. 
TAFFIA PLANOCONVEXA Butts 
Plate 172, E, figures 21-29 
Taffia planoconvexa Butts, UtricH and Cooper, Geol. Soc. Amer, Special Pap. 13, p. 181, 
pl. 37C, figs. 12-18, 1938. 
Figures of this genus are introduced for comparison with Aporthophyla, 
Toquimia and members of the Plectambonitacea. Taffia is at present the earliest 
known strophomenoid brachiopod and is the possible progenitor of some of the 
higher stocks. Its affinities to members of the Orthidae are obvious when the 
figures of Taffia are studied. 
Types.—Lectotype: 71461b; figured paratype: 71461a; figured hypotypes: 
91586, 91588a, 91590a,b. 
Horizon and locality—Odenville formation in Alabama: In the vicinity of 
Odenville, St. Clair County. 
