368 T. Davidson — Tertiary Brachiopoda. 



13. Terelratula orbiculata (Sequenza), PI. XVII., Fig. 15. Sicilian 

 Brachiopoda, pi. ii., fig. 7, 8, 9. 



Sig. Seq.uenza considers this shell to bear much external resem- 

 blance to the preceding one, but that it difi'ers from it in some small 

 detail in the shape of its loop. It occurs in the Lower Pliocene at 

 Eometta, Scoppo, and Gravitelli, near Messina. 



14. Terelratula Menegliiniana (Sequenza), PI. XVIL, Fig. 18. 

 Sicilian Brachiopoda, pi. ii., fig. 12, 13. 



This is a very distinct and remarkable species, on account of the 

 median depression observable in the anterior portion of its dorsal 

 valve, as well as from the numerous equidistant prominent concen- 

 tric ridges which ornament its surface. It occurs in the Lower 

 Pliocene of Eometta and Scirpi, near Messina. 



15. Terelratula sphenoidea (Philippi), PI. XVII., Fig. 16. Enume- 

 ratio Moll. Sicilige, vol. ii., pi. xviii., fig. 6, 1844. 



This species varies considerably in shape, but is distinguishable 

 from Ter. vitrea by several characters. It is usually widest about the 

 middle, most convex posteriorly, and flattened in both valves from 

 the centre to the front. It has been stated with uncertainty to occur 

 in the Middle Miocene of the Monte dei Cappucini and Gassino, 

 near Turin, also at Saravalle di Scrivia ; but the specimens in ques- 

 tion, which were lent me by the Cav. Eovasenda, appeared referrible 

 either to Waldheimia septigera or to Terehratella septata, on account 

 of the dark line they exhibit along the dorsal valve, from the 

 umbo to about the middle of the valve, which indicates the 

 internal presence of a septum, which Terelratula sphenoidea does not 

 possess. Sig. Michelotti states likewise that he has found it at La 

 Bonetta, in Piedmont, T. sphenoidea occurs abundantly in the Older 

 Pliocene of Messina and Calabria. 



16. Terelratula Rovasendina (Sequenza), PL XVIL, Fig. 10. Bra- 

 chiopodi Miocenici. Annali dell Accad. degli aspiranti Natural! di 

 Napoli. Third series, vol. vi., pi. i., fig. 1, 2, 3, and pi. ii., fig. 1, 

 1866. 



This appears to be a good species, which Sig. Sequenza describes 

 as intermediate in character between T. ampulla and T. vitrea. It 

 is a compressed shell, with a broad, slightly prominent, and flattened 

 mesial fold, and has been well described and illustrated by Sequenza 

 from a superb series of specimens collected by the Cav. Eovasenda 

 from the Middle Miocene near Casale, Baldissero ; and Termo-Foura 

 near Turin. 



17. Terelratula Galeotiim (Dav.), PI. XIX., Fig. 6, 7. 



Shell small, ovate, longer than wide, rounded laterally, nearly 

 straight in front. Ventral valve convex, somewhat carinated along 

 the middle, beak small, incurved and truncated by a large foramen. 

 Dorsal valve moderately convex, much less deep than the opposite 

 valve, flattened or slightly depressed near the front. Surface smooth, 

 or rather faintly marked with fine radiating striee. Shell punctures 

 rather large. Interior not known. Length 6, width 5^, depth 

 3 lines. This species differs from T. minor, with which it may be 



