Syiiojiyiny of I'tycliospira Scxplicata — Grcger. 15 
THE DISTRIBUTION AND SYNONYMY OF PTY- 
CHOSPIRA SEXPLICATA (WHITE 
AND WHITFIELD). 
Bv D. K. Gkbc.hk, I'ulton, Missouri. 
In Vol. VIII, Pt. 2, iPaleontology of New York, professor 
Hall proposed the term Ptychospira, for certain coarsely pli- 
cated shells previously referred to the genus Reizia of King, 
with the somewhat rare Retzia scxplicata White and Whit- 
field, * as the only known American species. This species is 
frequently met with in the Kinderhook of Missouri, and while 
being a rare species in number of individuals, it has been re- 
corded from numerous localities, under different names. 
Mr. S. A. Millerf figured and described this species under 
the name Retda plicata, from a collection of Chouteau fossils 
made by Mr. R. A. Blair of Sedalia, Mo. The horizon from 
which Miller's specimens came is the "Upper Chouteau" of 
Swallow and while not rich in Brachiopoda the following spec- 
ies were identified by the writer in a small collection furnished 
by the late O. A. Crandall, who collected in Miller's type lo- 
cality. Ptychospira scxplicata, Prodiictns hlairi, Productclla 
arciiata, Spirifer osagcnsis, Camarotocchia tnta, Camarotoechia 
coopcrensis, Spirifer latior. The specimens of P. scxplicata 
from this locaHty seldom exceed 8 mm. in length, 9 mm. 
broad and 4 mm. in thickness. 
At the base of the Kiesenger bluff, just above Warsaw, 
Benton county, Missouri, a number of well preserved speci- 
mens of P. scxplicata were collected from a drab, argillaceous 
limestone, stratigraphically lower than the typical exposures of 
Choteau in Cooper county. With them are associated : Pug- 
nax missouriensis, Lcptaena rhomhoidalis, Orthothetes inflatus, 
Camarotocchia coopcrensis, Spirifer uiissoiiriensis, Spirifer la- 
tior, Spirifer pecnliaris, Reticularia coopcrensis, Productclla 
arcitata, Dielasma popcana. 
In the Chouteau limestone (sensu strict 0) at Chouteau 
Springs, Cooper county. Mo., P. scxplicata is of rare occur- 
rence, the writer having found but four specimens in as many 
• Proc. Boston Soc. Nat. Hist., vol. viti, page 294-, 1«62. 
+ ISth Ann. Rep. Ind. Geol. Sat. Hist. Sur., 1894, p. 316, pi. 9. fiRs. 29-31. 
