T. Davidson — Tertiary Brachiopoda. 369 



sometimes confounded, in liavu>g a slight depression near the front 

 of its dorsal valve, while in T. minor this same portion of the valve 

 is partly convex. It was found by the Cav. Eovasenda in the Middle 

 Miocene of Gassino, on the Po, near Turin. 



18. Terehratula Miocenica (Michelotti), PL XVIII, Fig. 6. Precis 

 de la Faune Miocene de la Haute Italie. Harlem, 1847, pi. xvi., 



I know very little about this species, it bears some resemblance to 

 T. vitrea, but has a large foramen. It occurs in the Middle Miocene 

 of Gavi and of Serravalle di Scrivia^ 



19. Terehratula anceps (Michelotti), PI. XVIII., Fig. 7. Same work 

 as above, pi. xvi., fig. 3. 



Very little satisfactory seems to be known with reference to this 

 species ; Srg. Michelotti states it to be inequilateral and oblique; 

 but may this not be due to malformation or to the imperfect state of 

 his specimens ? It is said to be rare, and to occur in the Upper 

 Miocene of St. Agata near Tortone, in Piedmont. 



20. Terelratula f Bmjaniana (Dav.), PL XVII., Fig. IT. 



Shell small, obtusely five-sided, slightly longer than wide, broadest 

 about the middle, straight in front. Valves moderately convex, 

 flattened along the middle with a slight depression towards the front ; 

 beak small, incurved and truncated by a circular foramen lying close 

 to the umbo of the dorsal valve. Surface smooth, marked with a 

 few concentric lines of growth. Interior not known. Length 4, 

 breadth 3^, depth 2 lines. 



This small species much approaches by its shape to some examples 

 of Waldh. tamarindus, but has not the curved frontal line so generally 

 observable in the Cretaceous species. It was found by M. Bayan at 

 Bolca, along with Rh. Bolcensis and Rh. polymorpha, in a friable 

 yellowish tufa (his> stage G), and which, would be perhaps a little 

 higher up in the geological scale than are those beds which at 

 Bolca contain Ter. Fumanensis. It belongs to the Eocene period. 



21. Terehratula Sequenztana (Dav.), PL XVH., Fig.. 19, 19*.. Shell 

 ovate, or longitudinally oval, widest about the middle, sides and 

 front rounded, dorsal valve convex, most so along the middle. 

 Ventral valve slightly deeper than the dorsal one, with a median 

 depression or concave sinus commencing at about the middle of the 

 valve and extending to the front ; beak small, incurved and trun- 

 cated by a circular foramen. Surface marked with numerous close, 

 but slightly visible, longitudinal, radiating striee, which are here and 

 there crossed by concentric lines of growth. A large specimen 

 measured : length 7, width 5, depth 4 lines. 



This species is remarkable on account of its oval shape and con- 

 cave depression towards the front of its ventral valve, but especially 

 so from the numerous small radiating striee which ornament its sur- 

 face. Sig. Meneghini and M. Bayan consider it to be referrible 

 to the highest bed of the Eocene, while Sig. Michelotti and M. 

 Toumouer would place it at the base of the Lower Miocene. It 

 occurs at Crosara near Lugo, and at Brendola with Ntimmulites, 



