86 



Corallum discoidal ; corallites prismatic, rather variable in diameter, but 

 usually slender, measuring hardly over 1.8 mm.; diverging radially from the 

 base upwards. Wall thin, sometimes wrinkled transversely. Mural pores 

 arranged mostly in two alternate rows and occasionally in a single row ; 

 relatively large, ^ mm. in diameter and circular, being surrounded by an 

 elevated rim. Tabulae very thin, complete, usually horizontal but sometimes 

 slightly concave or convex. Septa very rarely recognizable as delicate 

 spinules in some of the large corallites. 



Obs. — This species is represented by a single, young stock, corallites of 

 which are therefore relatively slender, as a whole, in comparison with those 

 of a larger stock ; the corallites vary considerably in diameter in the present 

 specimen, no doubt owing to their rapid multiplication. Nevertheless the 

 general likeness in the internal structure of this specimen to the typical 

 examples of F. gotlandicus from Europe is considerable, and we are quite 

 convinced as to their specific identity. It is only necessary here to mention 

 that this young specimen from China strikingly resembles in its external 

 aspect Michclinia iiiicrostoina Yahe and H.wasaka^^ of similar dimension, 

 though the internal structure is naturally quite different in these two types 

 of the tabulate corals. 



Locality : — Lo-ling-po, north of No-lu-ping, prov. Hu-pei. 



Geological Age : — Gotlandian. 



Cephalopoda. 



Trochoceratidae. 



Trochceras, Barrande. 



Trochoceras sp. indet. 



PI. XVIII., Fig. 7. 



The figure shows a nautiloid fossil with an evolute shell ; it is here pro- 

 visionally referred to the genus Trochoceras S'mply on account of its 



1) Yabe and Hayasaka: Pala ozoic Corals from Japan,- Korea and China, p. 6i. 



