iS5 



The ribs of this species are ver\- promtiient and of a briUiant luster because of 

 tlieir great height and width as well as of the faint concentric lines. 



Another point to be mentioned is the obliquity of the pedicle opening 

 against the beak. In the genotype ^1. sqitai/icsa the truncation is nearh- per- 

 pendicular to the imaginary axis of the pointed beak, and is never oblique 

 against il. This peculiarity is quite constant in the species of the new genus. 

 Of course the pedicle hole is not so strictly perpendicular in the variety 

 rliomhoiddili- as in the t\'pe species, but it is much more strongl}" curved in 

 this species. In contrast with the very thick shell of the preceding forms the 

 shell of this species is ver)' thin. 



All these points may suffice to draw a line separating from the genotype 

 the present form as the second species. From the fact that the shell is con- 

 stantly smaller than the latter, this is called . [tliyrisiiia iniiior. 



Locality ". — Between Shang-shui-tang and Mien-tien, Nan-ning-hsien, 

 Nan-ning-fu, prov. Kwang-hsi. 



In the same locality a number of other Brachiopocls were found in asso- 

 ciation, namely ; 



DaluiancUa sfn'afiila 



Spirifcr .ziczac var. iindcciinpliLata 



^ I tin 'vis conctiiti'ica. 



Geological Age :— ]\Iiddle De\'onian. 



Rhynchonellidse. 



Rhynchonella, iMsciiF.R. 



Ehynchonella parallelepipeda, Bkonn. 

 ri. XXIII., Figs. 13-15. 



1S53. Tci-cbi-atula angiilosa, Schnl'R ; — Zusammenstellung u. Beschrei- 

 bung siimmtl. im Uebergangsgebirge d. Fifel vorkommenden 

 Brachiopoden nebst Abbild. derselben, p. 1S5. pi. XXV., figs. 5. 



1853. Terchrntula Aulh-ordiformis, Schnl'R : — ditto, pi. XXV., figs. 6a, b, 

 c, h, i, k. 



