284 
Pleurophorus, 1 have quite failed to trace a dental structure in any of the casts of 
M. carinata examined, and of which there are several good examples in the Australian 
Museum. M. carinata seems to be wholly devoid of hinge teeth, but possesses a very 
peculiar system of muscular scars. These have been well figured by the late Mr. Felix 
Katte,* and still further show its dissimilarity to Fleur oph or us. 
The double anterior and fringed muscular scars, and the accessory scars at the 
apex of the beaks, accord with the characters originally laid down by Dana for his 
genus IfcBonia, and i think it not improbable that this name will have to be retained for 
transversely elongate shells with the above characters, typified by M. elongata, Dana, 
and Fachydonius carinatus, Morris. 
Loc. and Horizon. Coral Creek, Bowen Biver, below Sonoma lioad-crossing ; 
Bowen River, at No. 25 Traverse Station (A. L. Jach) — Middle or Marine Series, 
Bowen River Coal Field. 
MiEONiA BECTA, Dana. 
Cleobis recta, Dana, Amei-iean Journ. Sci., 1847, iv., p. 154. 
Mceonia recta, Dana, Geology Wilkes’ TT. S.-Explor. Exped., 1849, Vol. x., p. 698, Atlas t. 7, f. 2. 
Notomija (Mceonia) recta, Etheridge fil., Proc. E. Phys. Soo. Edinb. , 1880, v., p. 299. 
Obs. The chief characters of this species are its very inequilateral and oblong 
form with the parallel dorsal and ventral margins. Professor Daua’s specimen 
measured three and a-half inches in length, but the shell here referred to O. recta 
measures seven and a-quarier inches in the same direction. Like all the Bivalves in 
my Colleague’s Bowen River Collection, the state of preservation is very bad, but there 
appears to be the remains of an obscure jiosterior slope, a character which is not 
mentioned in Dana’s description. 
The generic affinities are by no me&us clear, a state of matters common to a 
number of these Bivalves, and even Dana appears to have figured an imperfect example. 
Loc. and Horizon. Coral Creek, Bowen River, below Sonoma Road-crossing, in 
a yellow micaceous decomposed ironstone, of the Middle or Marine Series, Bowen 
River Coal Field (i2. L. Jack). 
Class — Gasteropoda. 
Order— PEOSOBRANCHIATA. 
Family— NATICIDiE. 
Genus— NATIGOF SIS, McCoy, 1844. 
(Synop. Garb. Lime. Eoss. Ireland, p. 33.) 
Naticopsis ? HAEPA)FOEMis, Etheridge, PI. 15, fig. 10. 
Naticopsis harpeeformis, Etheridge, Quart. Journ. Geol. Soc., 1872, xxviii., Pt. 3, p. 337, t. 18, f. 6. 
Obs. Under the above name Mr. Etheridge figured a fragment of a very 
problematical fossil. He considered it to be a portion of the body-whorl of a naticiforna 
shell, the suture being ornamented with “thirty or thirty-five nodes or tubercules, each 
of which occupies the summit of a rib or varicc.” He further pointed out that the 
whorls of some species of Loxonema are similarly ornamented. On the other hand. 
Prof. John Morris suggested that the fossil might be a portion of a small Goniatites, 
with a wide umbilical cavity. 
Either of these views may he the correct one, so very doubtful are its aflinities. 
Loc. and Horizon. Don River {The late E. Daintrec') — Gympie Beds. 
* Proc. Linn. Soc. N. S. Wales, 1887, ii., Pt. 1, p. 139, t, 3. 
