224 
Transactions Texas Academy of Science. 
SiMONDS, Frederic W. 
than simple, and at best unsatisfactory in several important particulars, 
and that with the advance of molecular physics we may hope for a better 
understanding of what we now, for convenience, term ‘superficial viscosity’ 
■and ‘capillary attraction.’ ” 
The following conclusions, reached by Mr. James C. iG-raham in his 
studies of the floating sand of the Connecticut river (Amer. Jour. Science, 
III, Vol. XL, p. 476), were confirmed: “That coarse sand can be floated 
away on a current of far less velocity than 0.4545 miles per hour ; and that 
the phenomena may indicate a possible explanation of the coarse particles 
of sand found in otherwise very fine deposits,” 
352 
Floating Sand: An unusual. Mode of River Transportation. 
Scientific American Supplement, Yol. XLI, No. 1048, pp. 
16745-16746. Feb. 1, 1896. 
A reprint of the preceding (without the table). 
353. Simpson, Charles Torry. 
Description of Four New Triassic Unios from the Staked Plains 
of Texas. 
Proc. U. S. National Museum, Vol. XVIII, pp. 381-385 (with 
cuts). Washington, 1896. 
(This paper was prepared for the Geological iSurvey of Texas, but on 
account of the failure of the State to provide for printing further reports 
of the Survey it was published by the U. S. National Museum.) 
“The material upon which this paper is based was sent to the writer 
for examination by Prof. E. T. Dumble, State Geologist of Texas. It was 
obtained from the Dockum beds, an extensive formation which underlies 
all or nearly all of the Staked Plains of Texas and southeastern New Mex- 
ico, reaching farther back into that Territory northwest of the Plains, and 
having some extension under the Cretaceous area south of them in Texas.” 
The limit of the plains on the east, north and west. The lithologic char- 
acters of the beds. Vertebrates shallow fresh water animals as determined 
by Cope. Unios of Gallinas Creek, New Mexico. Discussion of characters. 
Description of Unio sub-planatus, new species. Locality — “Duck Creek, 
Dicl^ens County, Texas.” Description of Unio dumhlei, new species. 
Locality — “Five miles northeast of Dockum, head of Duck Creek, Dickens 
County.’* Description of Unio graciliratus, new species. Locality — “South 
of spur. Headquarters 21, Dickens County, Texas; head of Duck Creek, 
Dickens County,’* “One right valve of what is probably this species was 
sent from the Dockum beds, at the southeast corner of Crosby County, 
Texas, with a number of U. dockumensis. Six rather imperfect specimens 
from the Dockum beds, in the southeast corner of Garza County, Texas, 
I am inclined to refer to this species, * * * .’* Description of Unio 
dockumensis, new species. Locality — “Southeast corner of Garza County, 
; Texas; windmill three miles north of Dockum; tank north of Double Moun- 
|_ tain River ; head of Duck Creek, Dickens County, Texas.” 
