90 DEVONIAN FOSSILS 
Comment. Specimen 27,213 from locality G 22 contains a par- 
tially decorticated dorsal valve of C. alpha which shows very 
clearly the punctate nature of the shell substance of this species; 
the nature of the median callus, brachiophores, and cardinal 
process can also be seen. The part of the external mould in view 
shows the presence of fine growth lines over the costellae, and 
two fine concentric rugosities. It shows also that there are inter- 
calations among the costellae as well as bifurcations, although the 
latter are more common. The costellae are rounded in cross- 
section. 
The genus Cariniferella is Upper Devonian in U.S.A. and 
Europe (Schuchert and Cooper 1932, Shimer and Shrock 1944), 
and has not been recorded from Australia before. 
Cariniferella beta sp. nov. 
Pl, ПІ, Figs. 2-4, 9. 
Type Material. Holotype consisting of the steinkern of a 
ventral valve, specimen 27,182 from locality G 22. Paratype con- 
sisting of the steinkern of a dorsal valve, specimen 27,210 from 
locality G 22. Conchidium polymitum occurs on the same face of 
the specimen. 
Description of Holotype. General structure of shell similar to 
that of C. alpha, but— 
(1) The proportions are noticeably different. The shell is trans- 
versely sub-elliptical, and measures 2:4 em. wide and 1-4 em. long, 
1.е., the proportions are the reverse of those found in C. alpha. C. 
ae is much wider than long, while C. alpha is much longer than 
wide. 
(2) The muscle field assumes approximately the proportions of 
the general outline, and is more squat than in С. alpha. The muscle 
field is 8-5 mm. long down the midline, and 7 mm. wide across the 
middle of the field. 
Description of Paratype. The general structure of the shell is 
very much like that in C. alpha, and the better development of the 
muscle field is probably just an expression of greater maturity in 
the paratype specimen of С. beta. However, the chief differences 
noted between the two species are: 
(1) The differences in proportion noted in the ventral valve 
apply to the dorsal valve as well. The paratype dorsal valve is 
2-2 em. wide and 1:3 em. long. 
(2) The muscle field is more squat than in the compared species, 
measuring 6-5 mm. long (1.е., from the umbo) and 8-5 mm. wide. 
