RETZIA. 



Gen us — R ktz i a , King. 



Retzia reuita, Von Buck (sp.), 1834. PI. IV, figs. 8—10. 



Teuebratula ferita, Von Buck. Ueber Terebrateln, 183-!, p. 76, pi. ii, fig. 37; Mem. 

 Soc. Geol. de France, vol. iii, pi. xvii, fig. 4. 



— — Phillips. Pal. Foss. of Devon, Cornwall, and West Somerset, p. 89, 



pi. xxxv, fig. 163, 1841. 



— — ■ IS Archiac et De Verneuil. Trans. Geol. Soc, 2nd ser., vol. vi, 



p. 368, pi. xxxv, fig. 3, 1841. 

 Sfiuigerina feiuta, If Orb. Prodrome, vol. i, p. 100, 1849. 

 Tereuratula — Quenstedf. Ilaudb. der Petrefactenkunde, p. 475, pi. xxxviii, figs. 13, 



14, 1851. 



— — Schnur, in Dank. u. Von Meyer's Palaeontograpb., vol. iii, p. 184, 



pi. xxv, fig. 4, 1853. 

 Retzia feiuta, Sandberyer. Die Bracbiopoden des Ilbeiniscben Scbichtensystems in 

 Nassau, p. 34, pi. xxxii, fig. 13, 1855. 



Spec. Char. Shell somewhat sub-triangular or oval, longer than wide, the greatest 

 width being situated about the middle of the shell, or towards the front. Valves mode- 

 rately convex. Surface costated ; in the dorsal valve there exist five, seven, or nine strong 

 ribs, of which the central one is usually (although not always) the largest, while in the 

 ventral valve there are four, six, or eight, with a deep median groove corresponding to the 

 central rib of the opposite valve. The surface of the valves is likewise crossed by 

 numerous fine contiguous concentric striae, while the shell-structure is very finely punctured. 

 Beak elongated, nearly straight, tapering, and truncated by a small circular foramen which 

 is rendered complete, and is separated from the hinge-line by a long narrow deltidiuin, a 

 flattened space or small triangular area existing between the beak-ridges and the short 

 nearly straight hinge-line. 



In the interior, the shelly spiral processes are directed outwards. Proportions 

 variable in different specimens. 



Length 6, breadth 5, depth 3 lines. 



05s. This elegant little species has been several times beautifully figured, and is 

 characteristic of the Middle Devonian limestone of England, as well as of the Continent. It 

 occurs at Barton and Lummaton, near Torquay; near Newton Abbot, and at Dock 

 Yard, near Plymouth. On the Continent it has been found in the Eifel at Villmar, in 

 Nassau, &c. 



