RHYNCHONELUD BRACHIOPODS 
95 
beds is unique. The deposit near Solon furnishes Pugnax pugnus 
(Martin), Melocrinus calvini Wachsmuth and Springer, and a 
very peculiar Stromatoporoid, none of which is found in the 
other Devonian formations.” 
The Lime Creek specimens in the Calvin Collection at the 
University all bear the label “Pugnax altus ” in Professor Calvin’s 
handwriting. The specimens collected by him from the State 
Quarry beds at Solon and North Liberty are labelled “Rhynchonel- 
la pugnus ” except one tray containing a score or more specimens 
from the State Quarry beds at Solon. This is labelled “Rhyn- 
chonella alta Calvin, Solon, Iowa.” The lot is a part of one of 
his earlier collections made in the seventies or eighties. In no 
case is there -a mixture of the two species in the trays. 
In 1910, Weller 13 illustrated the internal characters of the ros- 
tral portion of the valves of Pugnax pugnus (Martin) from the 
Mountain Limestone of Ireland. In 1914 he placed two American 
Mississippian species in this genus. 14 Neither of these is P. 
pugnus and no undoubted examples of this species are thought to 
occur in the American Mississippian or Devonian. 
In order to settle the generic status of. these Iowa Devonian 
rhynchonellids the junior author undertook the task of grinding 
away the beaks gradually and of making drawings of the brachial 
supports at intervals. The series of drawings are here presented. 
From them an ideal restoration of the brachidium and other in- 
ternal characters can be made out and it is apparent that our 
species belong to the genus Pugnoides. A description of each of 
the two species follows. 
PUGNOIDES ALTUS (CALVIN) 
Plate I, Figs. 1 to 16. 
1876. Rhynchonella alta Calvin. Read before the Iowa Academy 
of Science and a named photographic plate distributed. 
Shell below medium size, acuminate, subpentagonal in outline, 
length and width about equal, greatest width posterior to the 
middle. 
Pedicle valve strongly produced in front, the extended part 
being nearly at right angles to the plane of the valve; mesial 
sinus broad, beginning at a short distance in front of the umbo, 
and bordered laterally by high steep sides which gradually de- 
13 Bull. G. S'. A., Vol. 21, p. 508. 
14 111. Geol. Surv.j Monog. I, pp. 202-205. 
