Atrypa reticularis Linne var. desquamata Sow. nom. 

 PI. XXII., Figs. 12-15. 



1854. Tcrcbratula insquainosa, Schnur : — Zusammenstellung- u. Eesch— 



reibung slimtl. im Uebergangsgeb. d. Eifcl vorkommenden Bra- 



chiopoden, etc. Palaeontographica, 3. p. 182, pi XXIV., figs. 5a^„ 



b ; pi. XLIV., fig. 2. 

 1854. Tcrcbratula .-sonata, Schnur : — ditto, p. 182. pi. XXIV., fig. 6. 

 1864-71. Atrypa dcsquauiata, Davidson: — A IVTonogr. Brit. Dev. Brach 



58, pi. X., figs. 5-13 ; pi. XL, figs. 1-9. 

 1867. Atrypa reticularis. Hall: — Nat. Hist. New York, Palaeontologjv . 



IV., p. 316, pi. 51, figs. 10-24. 

 1 87 1. Atry/,y reticularis var. desquamata, Kayser : — Die Brachiopoden 



des Mittel-Li. Ober-Devon d. Eifel. Zeitschr. d. deutsch. g.eoI. 



Gesellschaft, XXIII., p. 544. 



1883. Atrypa reticularis var. desquamata, Kayser ■ — Devon. Versteiner— 

 ungen aus dem siidwestl. China. V. Richthofen's China, IV., p. . 

 82, pi. IX., fig. 2. 



1884. Atrypa desquamata, Tschernyschew : — Materialien zur Kenntn. 

 d. devon. Ablagerungen in Russl. Mem. Com. Geol., vol. I., No. 

 3, p. 19. pi. III., fig. 4. 



1S92-1907. Atrypa desquamata, Whidborxe : — A Monogr. of the- 

 Devon. P'auna of the South of England, vol., II., p. i 17. pi. 

 XIII., figs. 13-15. 



1912. Atrypa desquamata, Mansuy : — P2tude Geologique du Yun-nan 

 Oriental, II., Paleontologie. Mem. Serv. Geol. de lindochine, vol. ■ 

 I., fasc. II., p. 73. 



It is a well known fact that this variety, or species of some palaeontolo- 

 gists, differs from Atrypa reticularis Sow. in several less important points. 

 According to Whidborxe, who regards it as an independent species^ the chief 

 characteristics are " its flatness, its general transversness (though some ex- 

 amples are circular), the frequent and sometimes strongly marked median- 

 depression in the dorsal valve, the flatness of its margins, its large flat wide-; 



