21 



Incertae Sedis. 



Coscinocyathiis, Bornemann. 

 Cosoinocyathus cfr. cancellatus Bornemann. 

 PI. XVI., Fig. 8 a-b ; PI. XIX., Fig. 3. 

 Cfr. 1887. Coscinocrathiis caiicellatiisHoK'U'Euxsy. : Versteinerungen des 

 sardinischen Cambrischen Schichtensystems, p. 69, pi. XL, 

 fig. 4 c, 5 c ; pi. XIX., figs. 3, 4, 5 c ; pi. XX,, figs, i, 4, 5,— 

 8 ; pi. XXXI., fig. 15. 

 1899. Cosciiiocyatlius cfr. canccllatiis v. Toll : Beitrage zur Keiuit- 

 niss de.s Sibirischen Cambrium I., p. 45, pi. V, f, c ; pi. VII., 

 figs. 2 a 5 a. 



Coscitiocyat/iiis of moderate size ; external shape not exact!}- known, but 

 probably in the form of a warped bowl. Lamina hardlj- 4 mm broad, v'ery 

 narrow in proportion to the internal cavity. Radial septa very numerous, hardly 

 I mm. apart, complete. Tabulae almost as approximate as the septa and 

 complete, slightly convex upward (?). Intervalum partitioned b)' the septa 

 and tiibukie into numerous loculi with a quadrate vertical section. Outer 

 wall, septa and tabulae very thin and finely poriferous ; pores uniform in size, 

 numbering 5 for each millimeter. 



The specimen being firmly embedded in limestone, its true shape is at 

 present unknown ; but as one side of the limestone block enclosing it shows a 

 re-entrant angle of its lamina, it seems probable that it when complete, pos- 

 sessed the form of a warped bowl. The inner wall of the lamina is almost 

 wholly worn away so that its nature is not clearly ascertainable, though cer- 

 tainly it is very thin and poriferous. 



The irregularly folded wall and wide intervalum of the present specimen 

 makes it comparable with C. ca)iccllatus, first described by Bornemann from the 

 Lower (Middle ?) Cambrian of Sardinia ; the same or a closely allied form was 

 recorded also by v. Toll from the Cambrian limestone of Torgoschino along 

 the Jenissei, Siberia. 



Loc. : — l^etwcen Hou-ping and Mon-chia-ho, Hsing-shan-hsien, prov. 

 Hupei. 



Geological Age : — Cambrian, probabl_\- Lower Cambrian. 



