paleonet Tusoteuthis longa or longus?

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All,
I have a question regarding a spelling change in the name of a
Cretaceous squid from the Western Interior Sea.

Logan (1898, p. 497) described and named the Niobrara squid,
_Tusoteuthis longus_.

Since then, Miller (1968), Stewart (1976), Nicholls and Isaak (1987),
Stewart (1990), Stewart and Carpenter (1990) and others have used the
species name “_longa_”

Any idea what happened?  A gender issue in Latin?  Is it explained
anywhere? 

A Google search for _Tusoteuthis longus_ produced no hits, while a
search on MSN turned up a specimen in the collection of the AMNH labeled
with the original species name.

Regards,

Mike Everhart
Sternberg Museum of Natural History
Fort Hays State University
www.oceansofkansas.com

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References:

_Tusoteuthis longus_:
Logan, W. N., 1898. The invertebrates of the Benton, Niobrara and Fort
Pierre groups. The University Geological Survey of Kansas, Part VIII, 
4:432-518, pl. LXXXVI-CXX.

_Tusoteuthis longa_:

Miller, H. W. Jr. 1968. Invertebrate fauna and environment of deposition
of the Niobrara (Cretaceous) of Kansas. Fort Hays Studies, n. s.,
Science Series no.8, i-vi, 90 pp. (_Tusoteuthis longa_ re-described, and
_Niobrarateuthis bonneri_ described, pp 53-56)

Nicholls, E. L. and H. Isaak. 1987. Stratigraphic and taxonomic
significance of Tusoteuthis longa Logan (Coleoidea, Teuthida) from the
Pembina Member, Pierre Shale (Campanian), of Manitoba. Journal of
Paleontology 61(4):727-737, 5 figs. 

Stewart, J. D. 1976. Teuthids of the North American Late Cretaceous.
Kansas Academy of Science, Transactions 79(3-4):74. (abstract)

Stewart, J. D. 1990. Niobrara Formation symbiotic fish in inoceramid
bivalves. p. 31-41 In S. Christopher Bennett (ed.), 1990 Society of
Vertebrate Paleontology Niobrara Chalk excursion guidebook. Museum of
Natural History and the Kansas Geological Survey, Lawrence, KS.

Stewart, J. D. and K. Carpenter. 1990. Examples of vertebrate predation
on cephalopods in the Late Cretaceous of the Western Interior. pp.
203-208 In Boucout, A. J. (Ed.), Evolutionary paleobiology of behavior
and coevolution. Elsevier, New York. 

Kauffman, E. G. 1990. Cretaceous fish predation on a large squid. pp.
195-196 In Boucot, A. J., Evolutionary Paleobiology and Coevolution.
Elsevier, Amsterdam.

Carpenter, K., 1996. Sharon Springs Member, Pierre Shale (Lower
Campanian) depositional environment and origin of its vertebrate fauna,
with a review of North American plesiosaurs. Unpublished Ph.D.
dissertation, University of Colorado, 251 pp.