iS6 



1S65. RJiyiielioiiclla p) uiupilari:s, Jj.w iDsox : — A Monogr. Brit. Devon. 

 Brachiop., p. 66. pi. XIV. figs. 4-6. 



1571. Rliynclumclla parallclcpipcda , Kavskr : — Die Brachiopoden des 

 Mittel-u. Ober-Devon der Eifel. Z. d. d. g. G., XXIII., p. 507. 



1572. RliyncJtonclla piD alU lcpipcda, K.WSF.R : — Studien aus dem Ge- 

 biete des Rheinischen Devon, III. Die Fauna des Rotheisensteins 

 von Berlin in Westfalen. Z. d. d. g. G , XXIV'., p. 67S. 



1SS3. KIty)icJioii(-lla pa) allcLpiprda , Kav.se R : — Devonische V'ersteiner- 



ungen aus dem Siidwestlichen China. \'on Richthofen's China, 



vol. IV., p. 77. pi. VIII., fig. I. 

 1892. KJiyncluDuila pai allchpi pcda, Whiohoknf, : — A Monogr. Devon. 



I^'auna, South of luigland p. 129. pi. XV., fig. 10. 

 1905. RItyiiclionclla pajallcUpipcda , Schmidt : —Der oberste Lenne- 



schiefer zw. Letmathe u. Iserlohn, Z. d. d. g. G. LVIL, p. 551. pi. 



XXI., fig. 4. 



? 190S. Rhyiii hojiilla pa) allclipipL-({a,Viys.AV\ : — Contribution a la Carte 

 Geol. de I'lndochine, Paleontologie. p. 52. pi. XIII., fig. i. 



? 190S. RJiyiicIionclla c'i. parallclipipcda,'^i\-s.i\:\ : — ditto, fig. 2. 

 1913. Rliyiicho)iclla pivallLUpipcda, Loewe : — Die nordisch. Devonge- 

 schiebe Deut-sclilands. Xeucs Jahrb., Beil.-Bd. 35. p. 65. pi. 

 III., figs. 6 and 1 2. * 



In outline the shell is a nearly ec[ual-sided, rounded pentagon, consisting 

 of two convex valves, ventral and dorsal. Usually the thickness is 

 not very conspicuous but is very variable. It is a little wider than long 

 with an erect beak. The hinge-line is long and almost straight ; it 

 is a little shorter thin the greatest width of the shell. At various dis- 

 tances from the beak, — most usually in the center of the ventral \'alve — 

 begins a sinual depression wliich is rather shallow but quite wide 

 throughout ; it has nearly parallel sides and forms a rectangular tongue- 

 like prolongation at the anterior margin just closing up the space which is left 

 b\' the dorsal valve as the result of the rectangular upfold of its front margin. 

 The valve in its lateral and antcro-lateral marginal portions is bent up nearh' 

 perpendicularly to its surface. The median sinus is bordered on both its 



