SILURIAN OSTEACODA mOM NORTH AMERICA, ETC. 535 



§ III. The Devonian Beyrichia collected some j^ears ago by M. 

 Dumont at the Bosphorus, and noticed by Dr. Ferd. Eomer in the 

 ' Neues Jahrbuch,' &c. for 1863, having been kindly lent by M. 

 Dewalque for examination, is here figured and described in detail 

 (PL XX. fig. 1). 



Devonian Species. 



I. Primitia, Jones ^ Hall. 



1. Frimitia Clarkei, sp. nov. PI. XX. fig. 11. Ontario Co., New York. 



II. Beyrichia, M'Coy. 



2. Beyrichia devonica, Jones. PL XX. figSi \a,b,'2 a, b, 3. Bosphorus and 



Devon, 2 a h, and 3 are from Devon. 



3. — — suhquadrata, sp. nov. PL XX. fig. 4. Ontario Co., N.Y. 



4. Kl(kdeni, M'Coy, variety. PL XXI. figs. 1 a, b. Ontario Co., N.Y. 



5. Kolmodini, sp. nov. PL XX. fig. 6. Clarke Co., Indiana. 



III. EuRYCHiLiNA, TJlrich. 



6. Eurychilina reticulata, Ulrich. PL XX. figs. 13 «, b. Ontario Co., N.Y. 



IV. BoLLiA, Jones ^ Holl. 



7. Bollia bibbata, sp. nov. PL XX. fig. 12. Ontario Co., N.Y. 



8. Hindei, sp. nov. PL XX. fig. 5. Eighteen-mile Creek, N.Y. 



8*. Bollia ? An undetermined form, not figured. Eighteen-mile Creet, 

 Lake Erie, N.Y. 



V. Strepula, Jones ^ Holl. 



9. Strepula plantar is, sp. nov. PL XX. figs. Sa, b. Eighteen-mile Creek, 



Lake Erie, N.Y. 



VI. OcTONARiA, Jooies. 



10. Octonaria Li7inarsso7ii, sp. nov. PI. XX. figs. 7«, b. Clarke Co., 



Indiana. 



VII. MooREA, Jo7ies ^~ Kir/cby. 



11. Moorea KirJcbyi, sp. nov. PL XX. figs. 9a, b, 10a, b. Ontario Co., 



N.Y. 



Also, figured in woodcuts : 



12. Primitia (?) Walcotti, sp. nov. Thedford, Ontario, Canada, Woodcut, 



fig. 1. 



13. TJlrichia Conradi, gen. et sp. nov. Thedford, Ontario, Canada. 

 Woodcut, fig. 2. 



I. Primitia, Jones and Holl. 

 1. Primitia Clarkei, sp. nov. (PL XX. fig. 11.) 



Length 1*66 mm. 



Obliquely-subovate, narrow (low) and semicircular in front, boldly 

 and obliquely rounded behind, where the height is to that in front 

 as 16 to 13, measured at the ends of the hinge-line, which is 

 about half of the greatest length of the valve. Surface almost 

 uniformly convex, but fullest along the ventral and posterior 

 regions ; and marked with a relatively large oval pit between the 

 centre and the back. 



The nearest to this is Primitia Jiumilis, J. & H., referred to in the 

 Pebruary 'No. of the Q. J. G. S., p. 5 ; but it is much less oblong, 



