8 Art. 7. — M. Yokoyama : 



24. Terehrafella coretutica, Adams et Eeeve. 



Terehratella coreanica. Yokoyama, Foss. Miura Pcuin., p. 184, pi. XIX, figs. 25, 

 28. Foss. Up. Musasliiuo, p. 198, 



A single large specimen with both valves preserved, though a 

 little broken. 



35. Ter ehr at ell a{?) eoceelsa, YoKOYAMA. 

 (PI. I., Fig. 3, 4.). 



Shell tolerably large, either suborbicular or elongate-oval, 

 broadest near the middle, moderately inflated. Ventral valve 

 somewhat deeper than the dorsal one. Mesial fold hardly deve- 

 loped, tlie ventral valve being rather uniformly convex and 

 tbe place wliere the dorsal sinus should be being simply flattened, 

 or at utmost only very slightly concave- Beak moderately pro- 

 duced, incurved and truncated by a large round foramen almost 

 reaching the hinge-line and separated from^ it by a deltidium in two 

 small separate pieces. Beak-ridges sharp. Surface with numer- 

 ous sharp roof-like ridges wliich increase in number toward the 

 front by the interpolation of new ones, especially in the front-half 

 of the shell, the size of the new ones near the margin being 

 weaker. Lines of growth distinct, crossing the ridges and oc- 

 casionally forming constrictions. Shell-structure punctate. 



There are two examples. The one is perfect w^ith both valves 

 preserved and larger. It is 43.8 millim. high, 38.2 millim, broad 

 and 25.3 millim. thick. The other is a ventral valve nearly as 

 broad as high, being 32.6 millim. high, 32.4 millim. broad, and 

 11.3 millim. deep. 



The generic determination is at present impossible, but the 

 surface-sculpture shows some resemblance to that of Terehratella 

 dorsata (Gmelin), described and figured in Davidson's ,, Mono- 

 graph of Recent Brachiopoda" (p. 75, pi. XIV, figs. 9-19). 



36. Terehratellai?) sp. 



(PI. I., Fig. 10.). 



Two specimens. The shell is elongate-oval in shape, inflat- 



