NOTES ON A DECAPOD CRUSTACEAN 
123 
rather than of the family Palaemonidoe. The first pair of legs 
strikingly suggest those of Sabinea princeps, mentioned above, 
while the large antennal scales are also characteristic of the 
Crangonidae. However, in the absence of more complete mate- 
rial and, too, for the lack of a more appropriate genus for its 
reception the writer prefers tentatively to refer the specimen 
to the old genus Palaeopahemon. It is felt, moreover, that the 
characters pointed out are sufficiently different and important 
to deserve specific recognition and consequently the specific name 
iowensis is offered. 
The specimen is in the paleontological collections of the State 
University of Iowa. It was preserved in an exceedingly hard 
nodule of pyritic shale, a part of which has been removed with 
sharp instruments and much patience. 
The writer wishes to express his sincere appreciation to Prof. 
A. 0. Thomas for the opportunity of studying this specimen and 
for his assistance with the literature and with valuable sug- 
gestions. 
Paleontological Laboratories, 
State University of Iowa. 
