4  BERNH. LUNDGREN, ON AN INOCERAMUS FROM QUEENSLAND. 
minent, the right a little more so than the left one, no sinus 
or only a very little one in the anterior margin beneath the 
beaks. Concentric ribs of the shell conspicuous and distinct 
in the superior part, gradually evanishing towards the palleal 
part, which seems to be quite smooth. The fibrous shell-layer 
is about 1,5 mm. thick; no fragments of the other specimens 
seem to indicate a greater thickness of the shell. Smaller 
specimens seem to be more convex and rounded with a straight 
hinge margin continuing in a curved line in the posterior 
margin; the angle of the anterior margin sharp, the beaks not 
projecting, no sinus beneath them. The best preserved of these 
specimens is of the following dimensions: lenght 10 cent., 
breath 6,5 cent., thickness 3,5 cent., hinge margin 4 cent. 
This Inoceramus cannot, I beleive, be referred to any spe- 
cies from Europe hitherto described. Among the fossils, with 
which it bears some resemblance, Perna lanceolata Geinitz 
(D'ÖrRBIGNY: Pal. Franc.; Terr. crét., T. 3, p. 498, T..402), 
even not considering the generic characters and the smaller 
size, presents a curved hinge line and an angle between the 
hinge margin and the posterior one, more prominent beaks 
and a sinus beneath them. The figures of GEinitz (Charact. 
d. Schichten und Petrefacten der sächs. böhm. Kreidegebirges 
T. 21 f. 18 and Elbthalgebirge, I, p. 210, T. 46, f. 8) are still 
more different from the Queensland species. Among the spe- 
cies of Inoceramus, described by Gorpruss (Petrefacta Ger- 
maniae), I. nobilis from Lias (T. 109, f. 4) is broader, not quite 
so oblique, more convex and with a sinus beneath the beaks. 
I. laevigatus from the Jurassic system (T. 109, f. 6) presents 
all these characters still more distinct, and the angle of the 
anterior margin is an obtuse one. Among the cretaceous spe- 
cies I. propinquus (T. 109, f. 9) is more rounded, considerably 
more convex, not so oblique and the angle of the valves at 
the anterior margin very obtuse. I. labiatus (T. 113, f. 4) has 
the beaks erect or rather turned towards the posterior margin, 
the hinge margin forming an angle with this; the form is 
more elongated and slender, and though the angle of the an- 
terior margin is sharper than in the forenamed species it is 
not nearly so sharp as in the Queensland species. Though 
the form in question agrees in several characters better with 
I. labiatus, it must still be referred to a different species. 
I. aucella TrAutTscHorLp (Der Inoceramusthon von Ssimbirsk 
