272 
Family— MTTILID^. 
Genus—MTTILOPS, Hall, 1884 * * * § 
(Pal. N. York, v., Pt. 1, No. 1, p. xiv.) 
Mytilops ? coEEPGATA, sp. nov., PI. 40, fig. 11. 
Sp. Char. Shell obliquely mytiliform, triangular, produced more or less pos- 
teriorly and vontrally. Dorsal or cardinal margin short and straight, not obliquely 
elevated ; ventral margin oblique, longer than the cardinal margin ; anterior end small, 
somewhat puckered ; posterior margin obliquely truncated. Beaks terminal. Surface 
with from twelve to twenty step-like imbricating flattened and concentric ridges, 
non-striate, and graduating upwards to the umbones. Diagonal ridge broadly convex. 
Ohs. This is a small shell, much resembling in its surface markings McCoy’s 
Pullastra ? striatocostata,-^ except that it is oblique, the hinge-line short, and the 
concentric cost® plain. In the latter, which has been figured by De IConinclc J as 
Edmondia ? striatocostata, the dorsal and ventral margins are parallel, and the ends 
elliptically rounded. Here both are very oblique. The external markings give the 
present shell a very noticeable appearance. I have not seen the nature of the hinge, 
but it corresponds with the external characters of the shells named Mytilops by Prof. 
James Hall. There is some resemblance between Avicula Ifardii, De Koninck, 
and the present species, but the latter is a much deeper shell. 
Loc. and Horizon. Rockhampton District § \C. W. De Vis; Colin, de Vis) — 
Gympie Beds. 
Mytilops ?, sp. ind., PI. 14, fig. 20. 
[Compare Mytilus Bigsbyi, De Koninck, Foss. Pal. Nouv.-Galles du Sud, 1877, t. 21, f. 1.] 
Ols. The shells described by De Koninck from New South Wales will probably 
fall within Hall’s genus 3Iytilops. 'The present form is neither so thick nor yet so 
transversely expanded as this species, otherwise it appears to be very near it. Only two 
examples have come before mo, both much compressed, and one imperfect. The nature 
of the interior of the shell is unknown. 
Loc. and Horizon. Gympie {B. L. Jack) — Gympie Beds. 
Genus — JH0DI03L0BPHA, Hall and Whitfield, 1869. 
(Prelim. Notice Lamellibranc Shells, p. 72.) 
MoDiOiioEPnA f Dainteeei, sp. nov., PI. 14, fig. 13. 
Sp. Char. Shell transverse, elongately triangular, or irregularly subobovate, 
narrowed anteriorly, expanded posteriorly ; probably thin-shelled ; a narrow ill-defined 
sinus proceeds from the umbones to the ventral margin, immediately at the anterior end. 
Hinge long but not extending the whole length of the shell, rising slightly posteriorly; 
ventral margin straight at the anterior end, rather curved posteriorly. Anterior end 
small, lobate, posterior end subalate ; margin obliquely truncated. Anterior muscular 
scars small, close under the umbones ; beaks moderately acute ; valves convex, with 
strong diagonal ridges, the surface between them and the hinge more or less concave ; 
ornament unknown. 
*This genus may have been proposed at an earlier date, hut it is very difficult to get at the real dates 
of a large number of Prof. Hall’s genera, hi.s system of publication being, to say the least of t, a very 
complicated one. The above is the first reference I am acquainted with. (R. E. Jitnr.) 
+ Ann. and Mag. Nat. Hist., 1847, xx., p. 303, t. 14, f. 3. 
t Foss. Pal. Nonv.-Galles du Sud, 1877, Pt. 3, p. 269, t. 18, f. 3. 
§ See note, p. 199. . 
