1 89 



There arc two very siniilar species, namely Rh. pila Sciixl r^' and Kit. 

 orbigiiiana DE Vern.-^ In form and habitus these three are very much alike, 

 and they would no doubt belong to one and the same group of the genus, if 

 it were to be divided into several groups. However, if one examines the 

 •pictures of these forms given in Schnur's work as well as his descriptions, in- 

 dividual characteristics may be found sufficient to distinguish an}- one of them 

 from the others. There is a number of specimens of each of Rh. pila and Rh. 

 orhigiiiaiia derived from the Kifel in the Geological Institute of Sendai. They 

 were also examined by the writer in the course of the present stud}', and the 

 fact that these forms differ radically from Rh. parallclepip<:da Bronn, was 

 confirmed. " ■ , 



Locality : — Ning-chiang, Han-chuang-fu, prov. Shen-hsi. In association 



with 



Atrypa reticularis var. dcsquamafa , 

 A. reticularis var. richtJiofeni, 

 Aihyrisina squamosa. 



Geological Age : — This is a species very abundant in the Middle Devonian 

 rocks of Europe. It is especially common in the Calceola-hcdi of the Eifel and 

 Belgium ; i.e., the lower division of the Middle Devonian. 



Orthidae. 



Dalmanella, Hall and Clarke. 

 Dalmanella striatula Schlotheim. 

 Tl. XXIII., Figs. 20-7.2. 



« 1853. Orthis striatula, Schnur : — Zusammenstellung u. Beschreibung, 



etc., p. 215, pi. 38, fig. I. 

 1859. Orthis nmltistriata, Hall : — Nat. Hist. New York, Palaeontology, 



III., p. 176, pi. XV., fig. 2. 

 1865. Orthis striatula, Davidson : — Monogr, Brit. Dev. Brachiop., p. S7. 



pi. 8, figs. 4-7. 



i) and 2) Schnur: — op. cit., pi. XXVI. 



