GASTROPODA. 1077 
Fusispira suleata.] 
Fusisprra sutcata, 2”. sp. (Ulrich.) 
PLATE LXXX, FIGS, 5—7. 
Shell subfusiform, consisting of about six, gradually increasing and very depressed-convex whorls, 
the last one of which forms about two-fifths of the entire length of the shell; apical angle about 32°; 
suture deep in casts, scarcely distinguishable externally, the shell being thick; aperture elongate, 
obliquely subelliptical, strongly modified above by the preceding whorl, somewhat acuminate at both 
ends; surface of cast with several more or less obscure revolving furrows; exterior of shell appearing per- 
fectly smooth and glossy to the naked eye, but under a good glass showing revolving rows of very minute 
puncte, as shown in fig. 7. 
The whorls are less convex in the spire, the last is more abruptly contracted below, and the test only 
about half as thick as in F. schucherti. The revolving furrows shown on the interior cast distinguish it 
from all previously described species of the genus. 
Formation and locality—From the base of the Utica group or top of the Trenton, at Roger’s gap, 
Kentucky. 
Collection. —E. O. Ulrich. 
Fusispira suspFrusirormis Hall. 
PLATE LXXXI, FIGS. 38 and 39. 
Murchisonia subfusiformis HALL, 1847, Pal. N. Y., vol. i, p. 180; also 1850, Third Rep. N. Y. St. Cab. 
Nat. Hist., p. 171, pl. tv, fig. 2. 
Fusispira subfusiformis HALL, 1871, Twenty-fourth Rep. N. Y. St. Cab. Nat. Hist., p. 229. 
? Fusispira subfusiformis S. A. MILLER, 1874, Cin. Quar. Jour. Sci., vol. i, p. 316. 
Casts of the interior elongate-subfusiform, the spire elevated, ascending with moderate rapidity, the 
apical angle 25° or 26°; volutions six or more, casts, however, rarely retaining more than four, very moder- 
ately convex and generally about a third wider than high in the spire; last whorl contracting rapidly 
below; aperture somewhat semi-elliptical, the length equalling about two and one-half times the greatest 
width, and only a little more than one-third of the total length of the shell; outer lip curving forward 
slightly in the middle; suture of very moderate depth in casts, from which we assume that the test 
was thin. 
Hall’s original figures in his 1847 work give, as he states himself in the museum report cited, “but 
a very imperfect idea of the species.” Furthermore, we are satisfied that his original figures include more 
than one species, the apical angle and form of the aperture being quite different in figs. 2a and 2c, pl. 
XXXIX. In identifying the species we have relied chiefly upon Hall’s figure of a better specimen in the 
third museum report. The species is reported from the Utica group at Cincinnati, but we are inclined 
to doubt that the form found there is strictly identical with the Trenton originals of the species. 
F. subfusiformis is one of several closely related species. Of these F. terebriformis Hall, from the 
Utica group at Cincinnati, has a shorter spire, relatively longer aperture, and more convex whorls. 
Formation and locality —Rare in the Fusispira bed of the Trenton group, in Goodhue and Fillmore 
counties, Minnesota. Also in the middle portion of the group near Burgin, Kentucky. The species is 
frequently quoted in lists of Trenton fossils in New York and Canada, but as far as our experience is con- 
cerned, it appears that several species are there confused under the one name subfusiformis, among them 
the next described F’. convexa. 
Collection.—K. O. Ulrich. 
FUSISPIRA CONVEXA, 1. Sp. 
PLATE LXXX, FIGS. 8—10. 
This shell resembles F’. subfusiformis Hall but differs in the following particulars: The apical angle is 
wider, being from 38° to 37°, the latter in the specimen regarded as the type of the species; the whorls are 
