672 
fairly intact ; tut the whole of the test has been removed. It possesses the oblong 
outline of several species of Geromya, and was similarly inflated about the umbones. 
The dorsal margin is fairly straight ; the umbones much inrolled, overhanging a large 
false lunule. The exterior was concentrically and broadly laminated as in several 
Ceromy<B. The specimen is five and a-half inches long by three and three-quarter 
inches high. Its relation to the genus will be apparent if such species as Geromya 
excentrica, Yoltz, sp., are compared with it. 
Geromya is chiefly an Oolitic geuus^ but Agassiz has described species from the 
Neocomian. 
Loo. Maryborough {The Hon. A. G. Gregory'). 
Family— MACTEID^. 
Genus — LUTBARIA, Lamarclc, 1799. 
(Prodrome — M^m. Soc. Hist. Nat. Paris, 1799, p. 85.) 
Lctkabia, sp. ind. 
Ohs. A very indifferent east may perhaps be referable to this genus. On the 
other hand it is not unlike some forms of Siliqua or Gultellus. The specimen is two 
inches long, and broken posteriorly. It is a east of the exterior. 
Loc. Maryborough {The late R. Raintree). 
Order— PHOLADACEA. 
Family— PHOLADID^. 
Genus~TRREDO, Linneeus, 1758. 
(Syst. Nat., Edit, x.) 
Teeedo, sp. ind., PI. 43, figs. 11 and 12. 
Ohs. Portions of tubes resembling those of Teredo, especially the Cretaceous 
Teredo amphishesna, occur in the siliceous rock of the Croydon Gold Field. The valves 
of the shell are unknown. The tube is moderately tortuous and curved, two and 
a-quarter inches long, and seven-sixteenths of an inch in diameter. The test is thick. 
(PI. 43, fig. 11.) 
In addition to the species named there is also a resemblance to T. partita, 
Stoliezka,* and T. Requienianus, Math.,t of the French Chloritic Chalk, but our form 
is rather larger than the latter. It corresponds with species of this description better 
than it does with the smaller forms of the Oolitic rocks. 
A very interesting specimen (PI, 43, fig. 12) was given to me by the late Eev. 
J. E. T. "Woods, consisting of a number of shelly tubes of Teredo, most of them straight 
and parallel, but one or two curved, and preserved in a drab limestone. The longest is 
over two inches, with a diameter of three-qu.arters of an inch, but the average diameter 
is a quarter of an inch. Many of these tubes are seen in section, and at the larger end 
of one of them are two disjointed and displaced valves, probably those of the species. 
The specimens closely resemble Teredo crassula, Stol.,J and the section of the valves 
would agree intimately with those of our fossils. 
*Pal. Indioa (Cret. Fauna), 1871, iii., t. 1, f. 1. 
t D’Orbigny, Pal. Franj. Terr. Crfet., iii., p. 303, t. 348, f. 3-G. 
I Pal. Indica (Cret Fauna), 1871, iii., t. 1, f. 2 a and h. 
