504 GEOLOGICAL SURVEY OF THE TERRITOEIES. 



respond more nearly to lurrltella, I have concluded to refer it pro- 

 visionally 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. — Carletou's coal-mine, Coalville, Utah. Creta- 

 ceous. 



TUREITELLA (ACLIS?) MICRONEMA, Meek. 



Shell sma:ll terete or elongate conical; volutions about nine, nearly 

 flat, sometimes moderately convex, increasing gradually in size, last one 

 rounded or obscurely subangular in the middle; suture linear to mod- 

 erately distinct; aperture rhombic-subovate, angular above. Surface 

 ornamented by fine, regular, rather crowded revolving lines, six to eight 

 of which may be counted on each volution of the spire. 



Length of the largest specimen seen, 0.50 inch; breadth, 0.18 inch; 

 angle of spire about 19°, with slightly convex slopes. 



This may not be a Turritella, the specimens not being in a condition 

 to show the texture of the shell, or to give a very clear idea of its aper- 

 ture and lip. It would be a rather small species fo]*that genus, and if it 

 . possessed the delicacy of surface seen in those genera it might, perhaps, 

 with more propriety be referred to AcUs or Menestho. The fractured 

 lip in some of the specimens has somewhat the appearance of a slight 

 angularity or a very small notch at the base of the aperture, bub this 

 may be due to the manner in which it is broken ; if not, it would seem 

 to present affinities to the genus Mesalia. It will be readily distinguished 

 from the species I described under the name T. spironema, by its less 

 attenuated form and finer and less distinct revolving lines. It is also 

 not nearly so attenuated toward the upper part of the spire as that 

 species. 



Locality and position. — Coalville, Utah, from the Cretaceous below the 

 lower heavy bed of coal mined at that place. 



Fusus (jSTeptunea'O Gabbi, Meek. 



Shell rather small, fusiform; spine moderately prominent, conical; 

 volutions seven or eight, convex ; last one somewhat ventricose in the 

 middle, and rather suddenly contracted below into the narrow, slightly 

 twisted, more or less bent, and apparently moderately produced canal ; 

 suture well defined; aperture rhombic-subovate, and rather suddenly 

 narrowed into the canal below. Surface ornamented with equal, dis- 

 tinct, regularly disposed varices or vertical folds, about eight of which 

 may be counted on the penultimate volution, and less on the body-whorl, 

 where some of them become obsolete; crossing these are also seen fine 

 revolving lines, and, a little below the suture, apparently a shallow 

 revolving furrow, that gives it a slightly banded appearance. 



Length, including canal, about 0.87 inch ; bi'eadth, 0.40 inch;, slopes 

 of spire straight, and diverging at an angle of about 50°. 



The specimens of this species contained in the collection are quite 

 imperfect, being mainly casts, retaining more or less of the shell. From 

 such material it is, of course, impossible to determine, with much confi- 

 dence, the generic affinities of shells. I have, therefore, provisionally 

 referred it to the genus Fusus, putting in parentheses the name Nep- 

 tunea, with a mark of doubt, to indicate that I suspect it may belong to 

 that group, with the limits assigned it by some conchologists. It seems, 

 however, quite as j)robably to belong to Tritonidea, as understood by 



