DE. T. DAVIDSON ON EECENT BRACHfOPODA. 149 



87. CiSTEi.LA (?) LUNIFERA, Pliilippi, sp. (Plate XXII. figs. 5 & 6.) 



Terebratulu Imi'iferu, Pliilippi, Eiium. Mollusc. Siciiiaj, vol. i. p. '.)", tab. vi. figs. IG a~f, 1<S36. 



Orthis luuifera, Costa, Faima del regno di Napoli, p. 40, tav. iii. bis, figs. 3 a, b, & I, 1851. 



Morrisia luniftra, E. Suess, Uchor die Wolinsitze der Bracliiopodcn, Sitzuugsb. k. Akad. Wisscnseli. 

 Wien, 13d. xxxvii. p. 212, 1859. 



Aryiope [Tcrebratula) lunifera=T. fw/eZ/M/tt, Montcrosato, Nuova Ku vista dellc Conchy. Med., Atti del 

 Aecad. Palerruitaua di Scieiize, 1875. 



Terebratula (Morrisia) lunifera, L. Reeve, Couch. Icon. pi. x. fig. II, 18()1. 



Morrisia Ituiifera, Weiukauft', Die Couch, des Mittclmecres, vol. i. p. 288, 18G7. 



Aryiope liotiferu, Gwyn Jeti'reys, Mediterranean iloUusea { = A. cislcllulu), Ann. & Mag. Nat. Hist. 

 4th ser. vol. vi. p. G7, 1870. 



Shell small, length aud breadth half a line, thin, hyaline, somewhat orhicular, broadest 

 anteriorly. Dorsal valve very gently and uniformly convex, somewhat compressed, very 

 slightly indented at the umbo and at the frontal margin. Ventral valve gently convex ; 

 beak short, slightly incurved and truncated by a rather large incomplete foramen ; beak- 

 ridges sharply defined, leaving between them and the hinge-line a narrow triangular space. 

 Surface smooth, puckered near the margin, and traversed by fine concentric lines of 

 growth. Colour light yellowish white. A small submarginal septum rises in the 

 interior of the dorsal valve. On each side of the mouth the labial appendages form a half- 

 circle and do not apparently occupy much more than a third of the interior of the shell. 



Sab. Mediterranean Sea, off the African coast, 



Obs. Much uncertainty has prevailed Avith respect to the genus to which this so-termed 

 species should be referred. It was described and figured in 1836 by Pliilippi as 

 follows : — 



" T. testa minima ; subcordata, compressa, punctata, margine frontali subemarginato, 

 foramine incomplete, sceleto interne e lamella semilunata obliqua versus frontem aperta 

 constante. Specimina duo zoophytis inhaerentia inveni. Testa minima f'" louga, V" 

 lata, •!'" alta, cordata subpentagona, margiue frontali emarginata, parum convexa, con- 

 vexitate maxima in cardinis regionc, v. fig. c. Sub lente fortiori superficies punctis 

 minutis elevatis per series radiantes dispositis, aliisque minimis, impressis, densissimis 

 obsita. Area angusta satis elevata, foramen magnum iucompletum. Dcltidium distin- 

 guere non potui. Sceleton internum lamina obliqua semilunaris ad frontem prona et 

 aperta, v. fig. IG a et e. Color testae albidus." Philippi gives six figures of his little 

 shell ; in fig. a he draws a submarginal single septum as in Cistella, and he speaks of 

 a loop in the shape of a half-circular lamella. 



The form is, therefore, as the Marquis of Monterosato and Dr. Gwyn Jeffreys suggest, 

 more nearly related to Cistella than to Flatijdia. Costa, in his ' Fauna del regno di 

 Napoli,' describes and figures some of the soft parts of the animal, from a specimen which 

 he says belonged to Philippi's species, which occurs off the shore of Trapani, as well as 

 near the coast of Africa. He points out the differences between it and Flatydla anomi- 

 oides. The hinge-line in the dorsal valve is entire and not scooped out, as in the last- 

 named species, for the passage of the peduncle, and its interior is quite difierent from 

 that of Platydia. 



20* 



