416 On the Palceozoic Bivalved Entomostraca. 



11. Entomis aciculata^ Jones, MS. 1871. 



Entomis acicuMa, Jones, MS. 1871 (Mr. D. J. Brown's Collection. 

 See Rep. Brit. Assoc. Edinbiu'gh, 1871, Trans. Sect. p. 93). 



Upper Silurian : Pentland Hills, vScotland. 



12. Entomis dimidiata, Barrande, 1872. 



Entomis dimidiata, Barrande, 1872. Crust. Poiss. Sil. Boheuie (Ex- 

 trait &c.), p. 41 ; Syst. Sil. Bolieme, vol. i., Suppl. p. 51.3, pi. 24. 

 figs. 7-9. 



Upper Silurian ; Stages III. Ee2, Ff2, Ggl: Bohemia. 



13. Entomis migrans^ Barr. 1872. 



Entomis migrans, Barr. 1872. Ihid. p. 514, pi. 24. figs. 10-14, & pi. 27. 

 fig. 22. 



Upper Silurian ; Colony in Dd 5, and Ee 1, Ee 2 : Bohemia. 



14. Entomis pelagica^ Barr. 1872. 

 Entomis pelayica, Barr. 1872. Ibid.^. 515, pi. 24. figs. 1-6. 



Upper Silurian ; Stage F f 2 : Bohemia. 



15. Entomis rara^ Barr. 1872. 

 Entomis rara, Barr. 1872, Ibid. p. 516, pi. 25. figs. 23, 24. 

 Lower Silurian ; Stage Dd 5 : Bohemia. 



In the Carboniferous Limestone of Belgium Entomis con- 

 centrica (De Koninck) is a characteristic fossil. In the same 

 great geological formation in the British Islands four species 

 have been met with by Mr. Joseph Wright, F.G.S., and Mr. 

 J. H. Burrow, M.A. Entomis liconcentrica from Little 

 Island, Cork, Ireland, has been already noticed ; another, 

 E. obscura, Jones & Kirkby MS., from the same locality and 

 from the North of England, and two from Settle in Yorkshire, 

 E. Burrovii and E. KonincMana^ J. & K. MS., have yet to be 

 described. 



II. Entomidella, gen. nov. 



In 1861 the genus Entomis was intended to include E. 

 divisa, in which the nuchal furrow, altogether crossing the 

 valves, divides off the anterior moiety. But it is now pro- 

 posed to make a distinct generic group, Entomidella, for 

 E. divisa and E. huprestis^ in which the furrow is continued 

 across the valve, and no tubercle is present. 



1. Entomidella divisa^ Jones. 

 Entomis divisa, Jones, 1861. Mem. Geol. Surv. Gt. Brit., Edinburgh 



