NAUTILID^. 
163 
‘‘ flattened nodes are a striking feature in almost all the Schwabian 
[Bavaria] species of Bidorsati” He regards the Nautilus nodosus 
of Miinster as undoubtedly the same species. 
Remarks. The specimen representing this species in the Collection, 
though a very much crushed and distorted cast, exhibits some of 
the nodes at the angles of the periphery, and on one side the septa 
are laid open and the headed siphuncle is seen, occupying a position 
a little below the centre of the septa. The locality of this specimen 
is unfortunately not known. 
Horizon. Muschelkalk. 
Locality. Unknown. 
Represented in the Collection by a very imperfect specimen. 
Subgenus CENTROCERAS, Hyatt h 
This subgenus is thus defined by Professor Hyatt : — “ Centroceras 
includes a series of Devonian species with much compressed whorls, 
abdomen [periphery] often hollow, sometimes narrow, with one 
Fig. 26. 
Temnocheilus {^Centroceras) tetragonus. — a, front view of the cast of a fragment, 
showing the position of the siphuncle close to the peripheral margin, and 
the numerous septa ; h, lateral view of the same, showing the coarse nodes 
at the edge of the periphery. 
^ Proc. Boston Soc. Nat. Hist. 1883, vol. xxii. p. 283. The connection 
between this division and Temnocheilus appears to me to be so close that I do 
not consider that more than a subgeneric distinction between them can be 
sustained, though Hyatt regards Centroceras as a separate genus. 
M 2 
