Falceozoic Bivaloed Entomostraca. 



401 



1. Thlipsura corpulenta^ J. & H. 



Thlipsiira corpulenta, J. & H., Ann. & Mag. Nat. Hist. ser. 4, vol. iii. 

 (18G9), p. 214, pi. XV. figs. 1 a-1 d. 



Proportions t : — Length 28. Height 18. Thickness 16. 



The specimens originallj described and figured in 1869 

 were from the l)ase of the Wool hope beds and from the Wen- 

 lock Shale and Limestone, and their liability to variation 

 was noticed. Mr. Vine's specimens are from the Wenlock 

 Shales, rather abundant in the loioer^ and very abundant in 

 the upper Shales. The individuals vary considerably in relative 

 size, and the characteristic sulcus varies much in its depth. 

 Mr. Vine refers to this species in the Q, J. G. S. vol. xxxviii. 

 p. 48. 



'Vine Coll. no. x. 1 BedJ no. 46. Shales over 

 XVII. J Wenlock Limestone. 

 XVIII. Bedno. 25*.') Tickwood 



Sixty 

 specimens 



LXV 



LI. 

 LV. 



1) 3- 



} 



Beds. 



LXVI3, 5. 



LXVII. 

 LXIX. 



Bed no. 25. 

 Bed no. 46. 

 Shales over Wenlock Lime- 

 stone. 

 Tickwood Beds. 

 Bed no. 46. 

 Bed no. 46. 



Twenty- 

 nine 

 specimens 



"Smith Coll. 



no. 



1. 



Malvern Tunnel, west 



end. 

 Malvern Tunnel, west 



end, red shale. 

 Dormington. 

 Railway-cutting, side 



of Severn, Ironbrldge. 

 Railway-cutting near 



Much Wenlock. 



2. Thlipsura ticherosa,J. & H. 



Thlipsura tuherosa, J. & H., Ann. & Mag. Nat. Hist. ser. 4, vol. iii. 

 p. 215, pi. XV. figs. 2 a-c. 



Proportions : — L. 23. H. 14 (including the lateral tubercles). 



Th. 11. 



One specimen was in hand (from Wenlock Shale) when 



t If these proportional number.g be divided by 20 the results will be the 

 real measurements in millimetres and parts of a millimetre. 



X For the list of strata examined, see Ann. & Mag. Nat. Hist. ser. 5, 

 vol. xvii. p. 344 ; and Proceed. Geol. Poly tech. Soc. West liidiug, York- 

 shire, vol. ix. part 2, pp. 229-234. 



