The Upper Palaeozoic Fossils of Missouri. — Roivley. 351 
It is not plentiful. There is some doubt as to the correctness of the 
specific reference. 
Cyrtolites bennetti, n. sp. 
Plate xxviii. 
Figs. 61 and 62. — Front and side views of the type, natural size. 
The aperture of this shell is elongate, heart shaped. There is a 
mid-dorsal fold and the strong lateral lines of ornamentation curve 
sharpy toward this fold. The inner whorls are hidden by the outer. 
This shell is yYz mm. wide and is x^vy rare. It is named for my 
friend, Rev. John Bennett, of Kansas City, Kan. 
It occurs about the middle of the Lower Burlington limestone at 
Louisiana, Mo. 
Spirorbis? dubius, n. sp. 
Plate xxviii. 
Figs. 59, 60. — Two views of the type specimen, natural Size. 
This little shell was free and has no appearance of ever having been 
attached. 
It is composed of three irregular whorls, more or less distorted and 
crossed by sharp ridge-like lines. It coils loosely. This species is al- 
most certainly not Spirorbis but its generic relations are doubtful and 
for the present we leave it under Spirorbis. It is 5 mm. wide. 
It comes from near the middle of the Lower Burlington limestone 
at Louisiana, Mo. 
Amplexus vermicularis, n. sp. 
Plate xxviii. 
Fig. 51. — Side \iew showing nearly the entire length, natural size. 
Fig. 52. — Another view showing the contracted cup, natural size. 
This peculiar fossil has the external appearance of Amplexus bui 
despite the excellent preservation of the type specimen, the septa are 
not visible through the epithecal covering and are to be seen only on a 
weathered spot, and, doubtless, arc merely 'aised lines along the inner 
side of the outer wall. 
The external surface is beautifully ornamented by irregular cross 
ridges and crowded lines of growth. Placenta are. doubtless, present 
but not seen in the type specimen. 
The example figured is entire, rather elongate, distorted and con- 
tracted in places, yet gradually enlarging toward the front. The 
strangest feature of the type specimen is its contracted calix, giving 
the appearance of a second end for attachment and no open cup. 
The contraction begins about 1-3 of an inch from the anterior end and 
is almost closed at the front. Were it entirely closed the question 
might be asked, can this be an opercutate coral? Other specimens ap- 
parently of the same species but less robust and more elongate, have 
fine crowded septa but hardly developed beyond the appearance of 
raised lines and with placenta crossing the central open space at irreg- 
ular intervals without curvature. This fine coral is from the third di- 
vision of the Lower Burlinglon limestone at Louisiana, Mo. . 
