oe GEOLOGICAL SURVEY OF THE TERRITORIES. 
erately convex, last one rounded in the middle; aperture apparently 
ovate; columella rather regularly arcuate. Surface ornamented by 
squarish, rather regular, revolving, thread-like lines, with nearly equal 
furrows between ; about five to seven or eight of the lines and furrows 
are seen on each of the turns of the spire, and nearly twice as many on 
the body-whorl, where those below the middle become abruptly smaller 
and more crowded than those above ; lines of growth obscure and gently 
arched in crossing the volution; suture moderately distinct. 
“Length of the largest specimen found, 0.82 inch; breadth of body- 
volution, 0.23 inch; spire nearly regular, divergence of its slopes, about 
17°. 
‘There is a slightly polished appearance of the surface of this shell 
that is not often seen in true Turritella, and gives origin to some doubts 
whether it may not belong to some group allied to Aclig or Menestho. 
AS in size and general appearance, however, it seems to correspond more 
nearly to Turritella, 1 have concluded to refer it provisionally to that 
genus until better specimens can be obtained for study and comparison. 
None of those yet seen show satisfactorily the exact form of the aperture. 
“Locality and position.—Carleton’s Buel Ens, Coalville, Utah. Cre- 
taceous.” 
The foregoing is Mr. Meek’s description of, and remarks upon, this 
Species, to which no material addition can be made, because no other 
examples have ever been discovered. As already shown, in remarks: 
following the description of Cyrena carletoni on a previous page, and also 
by Mr. Meek (loc. cit.), the estuary Cretaceous fauna at Coalville, Utah, 
contains some forms that must be regarded as marine, as well as some 
that we must necessarily regard as of fresh-water origin. - It is also wor- 
thy of remark that some of the species of that fauna, whose living repre- 
sentatives usually characterize brackish waters, have congeneric repre- 
sentatives in the marine Cretaceous strata of the same neighborhood. 
In this remark more especial reference is made to the Neritide, but it 
may be suggested that the fauna of those strata was to some extent 
affected or modified by its proximity to the then existing coast. On the 
other hand, it is not quite so easy to account for the existence of somany 
forms that are regarded as wholly marine among the estuary forms, 
unless we assume that all the fresh-water and a part of the brackish-water 
forms were drifted from fresh and less saline waters to those in wees 
the deposit was made. 
Genus EKULIMELLA Forbes. 
EULIMELLA? CHRYSALLIS Meek. 
Plate 12, fig. 4 a. 
Eulima ? chrysallis Meek, 1873, An. Rep. U. S. Geol. Sur. Terr. for 1872, p. 506. 
No other examples of either this or the following species than those 
collected by Mr. Meek have ever been discovered. Therefore no mate- 
rial addition can be made to his deser iption, which is as follows: 
“Shell small, elongate-subconoid, or subfusiform; spire-conical; vo- 
lutions about eight, flattened nearly to the slope of the spire ; suture 
nearly linear; aperture subovate; inner lip a little reflected and mod- 
erately arched; outer lip unknown; surface smooth. 
‘¢ Length about 0.29 inch ; ; breadth 0.12 inch. 
‘7 am by no means sure that this is a true Hulima, not having seen 
