226 PROCEEDINGS OF TIIH MALACOT.OGICAL SOCIETr. 



and Etheridge, The Geology and Palceontology of Queensland, 1892, 

 p, 451), including therein further species from the Queensland 

 Cretaceous, all of which were described by Moore under the genus 

 Avt'cula. It was pointed out that the chief peculiarities of jllaceoyella 

 were connected with the hinge-structure of hoth valves, which widely 

 differed from tliose characterizing Aviculu ; but, unfortunately, the 

 specimen from Wliite Cliffs is too much buried in matrix to allow 

 of the comparison of internal characters ; from external features, 

 however, it may be said to resemble the published figures of this shell, 

 especially Avicala alaia of Etheridge, sen., from the Desert Sand- 

 stone of Queensland, recognized as a synonym of the present species, 

 and a kaoliuized cast of a valve from White Cliffs figured by 

 Mr. Etheridge, jun. (pi. iv, fig. 4), in his last account of this species. 



Locality. — White Cliffs, New Soutli Wales. 



Collection. — British Museum (Geol. Dept., L. 21272). 



Distribution. — Lower Cretaceous: Soutli Australia (Peak Creek and 

 Lake Eyre district) ; Queensland ; New South Wales. Upper 

 Cretaceous : Queensland (Maryborough) ; New South Wales (White 

 Cliffs). 



Fam. CYRENID^. 



CtKENOPSis MEEK! (Etheridge, jun.). PI. YI, Figs. 13, 14. 

 Macira meehi and Unicardium (?) mcehi, Etheridge, jun. : Jack and 



Etheridge, jun., Geology and Palaeontology of Queensland, 1892, 



pp. 472-3, pi. xxvii, figs. 2, 3; pi. xxvi, tigs. 13-15. 

 Cyrena meehi and CorbicuIa{?) meehi, Etheridge, jun., Mem. Roy. See. 



S. Australia, vol. ii, pt. i, pp. 30-1, pi. vi, figs. 8-13, 1902. 

 Cyrenofsis. — Type Macira (vel Corhicula) meehi, Etheridge, jun., 



Mem. Geol. Surv. N.S.W., Palseontology, No. xi, p. 28, 1902. 



Description {author's diagnosis of 1902). — Shell obtusely triangular, 

 somewhat cuneiform, and posteriorly produced, moderately convex. 

 Cardinal margins considerably arched, the anterior shorter than the 

 posterior ; ventral margins rounded throughout, curving rapidly 

 upwards Jinteriorly, but less curved posteriorly ; anterior margins 

 well rounded ; the posterior-ventral extremities produced, but obtusely 

 rounded. Umbones moderately large, obtuse and contiguous; anterior 

 and posterior diagonal slopes obtusely rounded, posterior area ill- 

 defined, ligament short and strong. A large, robust, projecting, 

 triangular, submedian cardinal tooth in each valve ; anterior and 

 posterior lateral teeth lamellar and projecting; sculpture of con- 

 centric lamellae, of slightly variable width, and on the anterior slopes 

 gathered in bundles ; the lamellae bear numerous very fine and regular 

 concentric lines. 



Remarhs. — There is only one specimen in the British Museum 

 which may be referred to this species. Its valves, in the closed 

 condition, are, however, fragmentary and without umbones, but its 

 cuneiformity, triangular outline, rounded ventral margins, produced 

 posterior margins, and abruptly truncated area, all agree with 

 Mr. Etheridge's figures, especially 13 and 15 of plate xxvi of the 

 Queensland memoir. Some slight additions mav be made to the 



