DE. T. DAVIDSON ON EECENT BEACHIOPODA. 97 



are well marked. In the interior of the dorsal valve there is no hinge-plate or distinct 

 cardinal process. The muscular scars are thick and excavated ahove; the septum 

 and loop are similar to those descrihed in Magasella Adamsi. The shell is yellowish, 

 with strong rose-colour on the ril)s and towards the edges. Length 2 lines, width 

 nearly 3 lines. 



Ilab. Hakodadi, Japan, on Terehratella coreanica, in GO fathoms (Stimpson). 



Obs. I have never seen this shell ; the ahove description was taken from a figure of the 

 single specimen in the possession of Mr. Dall, which he kindly forwarded to me for 

 examination, stating at the same time that it agreed with no other described species. It 

 evidently approaches in character to Magasella Adamsi ; but there are differences between 

 the two that cannot he cleared away by the inspection of a single specimen. A search 

 for more examples should be made in the locality where this one was obtained, in order 

 to determine their real specific value. 



54 Magasella Cumingt, Davidson, sp. (Plate XVII. figs. 23-32.) 



TerebrateUal Ciiminc/u, Davidson, Ann. & Mag. Nat. Hist. 2nd scv. vol. ix. p. .308, 1852, and Proc. 

 Zool. Soc. 1852, p. 78, pi. xiv. figs. 10-10. 



Magasella Cummyii, Woodward & Gray, Catalogue of the Bracliiopoda m the British Museum, 

 p. 99, 185.3; Woodward, A Manual of the Mollusca, p. 217, 1856; A. Adams, The Genera of Recent 

 Mollusca, p. 577, i)l. cxxxi. fig. 1, 1858. 



Terebratula {Botichardia) Cumingii, L. Reeve, Conch. Icon., Monogr. of Terebratulu, pi. viii. fig. 30, 

 1861, and Ann. & Mag. Nat. Hist. 3rd ser. vol. vii. p. 179, 1861. 



Terebratula [Bouchardia) fibula, L. Reeve, Conch. Icon., Monogr. of Terebratula, pi. viii. fig. 30, 1861, 

 and Ann. & Mag. Nat. Hist. 3rd ser. vol. vii. p. 180, 1861. 



Magasella Cumingii, Dall, A Revision of the TerebratulidcTe, Amer. Journ. of Conch, vol. vi. p. 137, 

 1870, and Proc. Acad. Nat. Sci. Philadelphia, 1873, p. 188 ; Davidson, Report on the Brachiopoda, 

 Voyage of H.M.S. 'Challenger,' Zool. vol. i. p. 48, 1880; E. Deslongchamps, Etudes critiques sur 

 des Brachiopodes nouveaux ou peu connus, p. 204, 1884. 



Shell very thick, ovato-oblong, marginally rounded laterally and in front, tapering 

 posterioi'ly. Dorsal valve uniformly convex, or mesially slightly depressed, close to the 

 front. Ventral valve deeper and more convex than the dorsal one, beak produced, 

 incurved, and truncated by a small oval-shaped foramen beginning at the summit of the 

 beak and directing itself on the opposite side to the area. Area triangular, elongated 

 and excavated, deltidium narrow. Surface smooth, strongly marked with concentric hnes 

 of groAvth, salmon-coloured with a tinge of red. Shell articulating by means of two 

 strong teeth in the larger valve and corresponding sockets in the smaller one. Hinge- 

 plate large, hollowed out, with a narrow longitudinal elevation along the middle, 

 cardinal process divided along the middle ; a longitudinal mesial elevated triangular- 

 shaped septum extends from under the hinge-plate to about two thirds of the length of 

 the dorsal valve, and by a gentle curve reaches and touches the top of the larger 

 valve near to its anterior portion, whence it descends by an almost perpendicular line to 

 the bottom of the valve. The calcareous riband-shaped lamellae first proceed from the 

 socket-walls, directing themselves by a gentle curve to the anterior portion of the septum, 

 where they become attached ; above these another pair, which are anchor-shaped, are 



