308 MR. T. DAVIDSON ON JAPANESE BRACHIOPODA. [Apr. 18, 



valve marked with about eighteen ribs ; of these, two fine median ones 

 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 exca- 

 vated 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 my 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. truncuta, Linne, M. monstruosa, Scacchi (if not a variety of 

 the first-named species), M. sanguined, 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 M. 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 coin- 

 ing for it another subgeneric designation. 



Megerlia sanguinea, Chemnitz. (Plate XXXI. figs. 1, 2.) 



Anomia sanguinea, Chemnitz, \T&b, = Terebratula erythroleuca, 

 Quoy, = T. 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. 



Hub. 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 plenti- 

 fully in 1859 at Tahiti by Mr. Deplanche. 



Var. reevei (Plate XXXI. fig. S)=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. Tts colour is pure white, and it closely resembles the 

 type of M. sanguinea in all other respects, except perhaps in size, 

 the specimen of M. reevei dredged by Mr. Adams exceeding some- 

 what in proportions any of the examples of M. sanguinea that have 



