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Show 308 MR. T. DAVIDSON ON JAPANESE BRACHIOPODA. [Apr. 18, valve marked with about eighteen ribs ; of these, two fine median lie in a kind of sulcus in each valve and extend from the umbo to the front, while the others are both irregular in width, stouter, and do not extend to more than half of the length of the valve from the margin. The lines of growth are well marked. The shell is of a yellowish colour, with strong rose-colour on the ribs and towards the edges. In the interior of the dorsal valve there is no hinge-plate or distinct cardinal process; the muscular scars are thick and excavated above ; the septum and loop is similar to that described in the preceding species. Length 2, width nearly 3 lines. Mr. Dall has kindly allowed me to add this description to my notes on Japanese species. A single example was found by him attached to a specimen of T. coreanica or miniata, Gould, that had been dredged at Hakodadi in 60 fathoms of water. It evidently much approaches in character to m y M. adamsi; but there are differences between the two that cannot be cleared away by the inspection of a single specimen. It must therefore be left for future observers to determine whether the two may not constitute variations in form of a single species. Genus MEGERLIA, King. M. truncata, Linne, M. monstruosa, Scacchi (if not a variety of the first-named species), M. sanguinea, Chem., and its var. reevei, Adams, are the only recent species attributable to this genus. Mr. Dall is of opinion that there is no difference in the interior of M. sanguinea and M. truncata, except that the lateral lobes are open instead of closed in 31. truncata, and that this and the external shape of the shell may perhaps serve as characters for the creation of a subsection. I do not myself, however, see the necessity of coining for it another subgeneric designation. MEGERLIA SANGUINEA, Chemnitz. (Plate XXXI. figs. 1, 2.) Anomia sanguinea, Chemnitz, 178b, = Terebratula erythroleuca, Quoy, = 71. sanguinea and pulchella, Sow., -Megerlia sanguinea, Dav.,=Ismenia sanguinea, Adams and Dall. All the specimens I have seen of this beautiful little shell were of a whitish or rather yellowish colour freckled with bright crimson. Hab. M. sanguinea has been found in several localities. Mr. A. Adams dredged it alive at Mino-Sima in 63 fathoms. It is common near the Philippine and Sandwich islands, and was dredged plentifully in 1859 at Tahiti by Mr. Deplanche. Var. REEVEI (Plate XXXI. fig. 3) = Ismenia reevei, A. Adams, Ann. & Mag. Nat. Hist. vol. xi. 3rd. ser. p. 99, 1863. Only one example of this shell appears to have been found by Mr. A. Adams. Its colour is pure white, and it closely resembles the type of ilf. sanguinea in all other respects, except perhaps in size, the specimen of M. reevei dredged by Mr. Adams exceeding somewhat in proportions any of the examples of M. sanguinea that have |