DK. T. DAVIDSON ON RECENT BRACHIOPODA. 163 



Family RHYNCHONELLIDyE. 



The genus BhiinchoneUa, Fisclier, 1809, and the genus Atrctia, Gwyn Jeffreys, are the 

 only representatives of this family found in the recent state. 



The genus Mhynchonella is one of the oldest types of life, and has heen largely repre- 

 sented since Silurian times. Sis species are still living in tlu^ present seas, viz. : — 



1. RhjiichoncUa psittacea, Clicmiiitz, 1780. 



2. 7ii(jncans, Sowerby, 184-6. 



3. I u eld a, iio\\\ A, 1860. 



4. Rhynchonella cornea, Fischer, 1885. 



5. Gray}, Wocxhviu'd, 18")."). 



0. Dodo/cini, Davidson, 188u. 



The first two species are very abundant, the others much less so. Of the spiny Ehyn- 

 chonella D'dtlerlehii four specimens have heen dredged, and we are only acquainted with a 

 single example of lUtynchonella Grayi. The shell in all is fibrous and impunctate. 

 The genus Rhynchonella is characterized by a very insignificant development of internal 

 septa. In the ventral valve generally only dental plates are present, which do not unite 

 in the middle line, and in the dorsal valve an inconspicuous median septum is developed. 

 The hinge-plate is deeply divided, supporting two slender curved lamelke. The animal 

 has elongated spiral labial appendages, directed imvard towards the concavity of the dorsal 

 valve. Mantle not adhering, its margin fringed with a few short seta;. 



93. llHTNcnoNELLA PSITTACEA, Chemnitz, sp. (Plate XXIV. figs. 1-11.) 



Anomia, Lister, Hist, sive Syu. methodicae Concliylioruiu, tab. 211. fig. 46, 1685. 



Bee de per roquet, Davila, Cat. Syst. vol. i. pi. xx., 1767. 



Anomia ?, Lister, Couch, tab. ccxi. fig. 16, 17(58; Favanne dc Moiitcervellc, La Conchy) iologie, 



pi. xli. fig. 24, 1780. 



Anomia rostrum psittacea, Chemnitz, Neues syst. Couch. -Cab. vol. viii. pi. Ixxviii. fig. 713, 1785. 



Anomia uquilina, Solander, MS. no. 14, 1757. 



Lampas psittacei, Calonnc, Catalogue of the various articles which compose the Coll. of ]\I. de 

 Calonne, 1797. 



Anomia psittacea, Gmeliu, Linn. Syst. Nat. p. 3319, 1788. 



Anomia , d'Argenville, Hist. Nat. Conchyliologie, etc. tab. 23. 



Terebratula psittacea, Bruguierc, Encyclop. Meth. pi. ccxliv. figs. 3a, 3i, 1789; Klein, Tentamen 

 Methodi Ostracologica-, pi. xii. fig. 84, 1753. 



Ano7nia psittacea, Dilhvyn, Descriptive Catalogue of Recent Shells, p. 293, 1817. 



Terebratula psittacea, Lamarck, An. sans Vert. vol. vi. p. 248, 1819. 



Anomia psittacea, Turton, A Conch. Dictionary of the British Islands, p. 5, figs. 42-44, 1819. 



Terebratula psittacea, Fleming, Hist, of Br. An. vol. i. p. 368, 1828. 



Gijjndia psittacea, ^Meuke, Syn. Meth. Moll. p. 96, 1828-30. 



Terebratula psittacea, Blainville, Diet. Sci. Nat. t. liii. p. 140, 1828 ; Miiller, Index Moll. Gronlandiae, 

 Nat. Tidsskr. iv. p. 76 ; Owen, On the Anatomy of Terebratula, Trans. Zool. Soc. vol. i. p. 146, pi. xxii., 

 1833 ; Quenstedt, Ueber das Oeffnen und Schliessen der Brachiopodeu, Wicgraann's Archiv, Bd. ii. p. 220, 

 pi. iv. figs. ,1 & 6, 1835; Davidson, Ann. & Mag. Nat. Hist. ;:nd ser. vol. xvi. p. 436, 1855; Lamarck, 

 An. sans Vert. vol. vii. p. 333, 1836 ; Anton, Verzeichniss der Conchylien, p. 23, 1839; G. B. Sowerby, 

 A Conch. Manual, p. 203, 1842; Kiister, Chemnitz's Conch.-Cub. vol. vii. pi. ii. figs. 18-20, 1813; 

 Sowerby, Thes. Conch, p. 342, pi. Ixxi. figs. 78 80, 1846. 



Hiipothyris psittacea, King, Ann. & Mag. Nat. Hist. vol. xviii. p. 238, 1846. 



Hemithyris psittacea, d'Orbiguy, Considerations Zool. sur Ics Brachiopodes, Comptes Rendus, t. xxv. 

 p. 268, 1847. 



SECOND SEllIES. — ZOOLOGY, VOL. IV. 22 



