193 



striae are curved outward in the lateral portion of the valves, but they run 

 straight away in the median portion. 3-4 of the striae occupy a distance of 

 I mm. along the anterior margin. 

 Dimensions ; — 



Length. Width. Thickness. Hinge-line. 



15 mm. 20 mm. 9 mm. 9 mm. 



13 „ 15 4 „ (dorsal) 7 „ 



9 m II 5 4 » 



Localities. — i. T3etween Mien-tien and Shang-shui-tang, Nan-ning- 

 hsien, Nan-ning-fu, prov. Kwang-si ; 2. Between Wei-ningand Tou-tang, Wei- 

 ning-chou, Ta-ting-fu, prov. Kwei-chou ; 3. South of San-toi-pa. Chao-hua- 

 hsien, Pao-ning-fu, prov. Sze-chuan. 



In the first locality this species was found in association with Athyris 

 concciitrica and S/y/rifrr zic::iac var. nndcciniplicata. The associate fossil in 

 the third locality is . \trypa rcticiihiris var. ricJttliofcni. On the other hand 

 this species was accompanied Ijy an upper Devonian species, Spirifer dis- 

 jiDictiis var. vcrncuili, in the second localit}'. 



Geological Age : — Dalmanela stnatula is existent through all the stages 

 of the Devonian foramation, but it is most common in its middle division.^* 

 It is a " sehr haufiges, bereits im Unterdevon auftretendes, durch das ganze 

 Mitteldevon hindurchgchendes, auch ini Oberdcvon vorhandcnes Fossil.^'" 

 The Chinese species represents two stages of the Devonian, namely, the 

 specimens from the first and the third localities are of the Middle Devonian 

 age, while those of the second locality represents the Upper Devonian. 



i) Loewe: — op. cit., p. 53. 



21 K-\yser: — op. cit., 1871, p. 59g. 



