Vo^- I- -^J- S. Chang: — Brachiopoda from the Orthis Bed (in) 19 



of the Neichia FormoAion 



Reed's fig. 15, Tl. VTI, gives: 

 Greatest width = 10 mm 

 Hinge line = 10 mm 



Height = 7 mm 



Proportion of height to width = 1.43 



Remarks: Owing to the imperfect nature of the specimen the true status of 

 this species is not definitely known. It is referred to Rafinesquina muthensis Reed, 

 because their characters are apparently in close affinity. They have, however, 

 this difference; the greatest width of Rafinesquina muthensis Reed is at the hinge 

 line while that of our species lies about the middle part of the shell. There are 

 two other specimens (X 244 and X 246 PI. II, Figs. 11a and 13a) which come from 

 the same slab but shew a slightlv different form. They are more or less conical in- 

 stead of elliptical in shape. For the present they are classified together with X 

 245, but that they may prove to be different is not entirely impossible. 



Horizon and Locality: Occurs with the preceding. Coll. C. C. Yii. (Ser. 

 Nos. X244, X 245, X 246; Cat. Nos. 3389, 3390, 3391). 



CONCLUSION. 



The brachiopod fauna of the Yangtzeella Beds of the Gorge district is not 

 yet fully known. Several years ago Miss Kolarova made a study but her results 

 have not yet been published. Judging from the preliminary fossil lists of Pro- 

 fessor Lee and Mr. Yii and comparing Miss Kolarova's material with the one des- 

 cribed in this paper it at once becomes evident that Yangtzeella and Clitamhonites 

 are the dominant brachiopods in western Hupeh while Orthis takes their place in 

 northern Hupeh as alreadly pointed out in the introduction. A difference of 

 faunal facies like this can lead to but one conclusion; namely, the existence of a 

 different horizon in the northern district. Whether or not the fact is such and what 

 is the exact relation of the horizon to the Yangtzeella Beds in the Gorge District 

 if it does exist, remain to be substantiated by further and more detailed stratigra- 

 phical work. 



