448 
Nor is it at all certain wbat it may be, and I quite agree with an opinion expressed by 
Prof. Ealph Tate, at a late meeting of the Australian Assocmtion for the Advancemen 
of Science,* that it is impossible to arrive at a definite solution of tins shell s iden i y. 
Avicula JrfffmtenWs, PhilL, is a much more oblique species than that repre- 
sented in Moore’s figure, and agrees much better with our figure of Lima Bandu (.Pi. ii, 
fig. 13), but the cost® of tlie former are finer and more numerous. 
Prof. Tate suggested Fecten as a genus for this fragment, and it is quite possib e 
he may be right ; but as the figure appears to show some degree of obliquity I have placed 
it provisionally in Lima. 
Loe. Wollumbilla {The late Bev. W. B. Clarice). 
Lima ? mhutistbiata, Moore, PI. 24, fig. 17. 
Lvma multistriata, Moore, Quart. Joum. Geol. Soc., 1870, xxvi., p. 248, t. 12, f. 5. 
Sp. Char. Shell very convex, oblique ; ears very small ; hinge-border very 
narrow ; surface with about forty depressed rounded cost®, with narrow interstitnii 
This species can only be regarded as a very unsatisfactory one from the 
state of preservation of the original specimen. This is stated by Mr. iloore o e 
“ somewhat abraded,” and with the ventral margin incomplete. I much question i an 
identification could be effected by means of the description and figure. 
The name Lima multistriata had, according to G-iimbel, been already applied by 
Geinitz to a species of the present genus. 
Loc. Wollumbilla {The late Bev. W. B. Clarke). 
Oriler-MYTILACEA. 
Pamily— AVICULID^. 
Oemis — OJLYTOMA, Meek, 18G4. 
(Smithsonian Check-list American Cret. toss., p. 20.) 
OxxTOMA bockwoodensis. sp. nov., PI. 24, fig. 15. 
So Char. Shell (left valve) subrotuiidate, very convex and tumid, alate pos- 
teriorlv, and more or loss oblique. Hinge-line straight, but not equal to the width of the shell ; 
ventralmargin obliquely rounded. Anterior ear, or wing, not well preserved, but apparently 
not distinctly separable from the anterior end of the shell; posterior wing modern e y 
laro-e, flattened, abruptly cut off from the body of the shell by a marked posterior s ope. 
Umbo depressed but evenly convex, inrolled hut not greatly overhanging e nnge 
line. Surface with fourteen or flfteen strong, simple, non-spinous, distinct radiatni„ 
coat® the interspaces flattened, or even a little concave, occasionally bearing a smaller 
interpolated rib, but quite distinct from the larger ones, the interspaces being crosse 
by almost microscopic wavings ; the posterior wing bears not more than one or two cost®. 
Ohs Tl\e present species is evidently congeneric, so far as the characters o 
left valve go, with those bivalves for which the late Mr. P. B. Meek proposed the genus 
Oxvfoma-yh., Avicula Mumteri, Broun ; A. ecliinata, Munster; and Avicula costafa, bUy. 
These remarks are, of course, made on the supposition that the flat valve will correspond 
with those of the foregoing species ; at jiresent, however, it is unknown. 
0 rockiooodensis also stands in the same relation to Stoliczka s Pseudomono 
semiglolosa,\ and is even closely rel ated specifically. But the Indian shell is n^ 
* Proo. Austr. Assoc. Adv. Sci. for 1888 [188!)], i., p. 229. 
t Pal, Indica (Cretaceous Fauna), 1871,’.iii., Pts. 5-8, p. 402, t. 26, f. 1. 
