Pakeozoic Bivalved Entomostraca. 39 



Murchisonia, Bellerophon, and Orihoceras. Thus in some 

 few instances we find Carbonice associated with fossils that 

 are either estuarine or marine, or have decided marine affini- 

 nies. In the majority of cases they are found with fossils 

 whose natural habitats we do not know. This is the substance 

 of our present knowledge on the question of the physical con- 

 ditions belonging to deposits containing the above-described 

 species. 



The following list may be of use in showing what Ento- 

 mostraca occur in the British Coal-measures besides six of the 

 seven described in this paper. 



List of Bivalved Entomostraca described from the Coal-mea- 

 sures of Great Britain^ with References to Figures of the 

 Species. 



1. Cypridina radiata, J., K., fy £., Monograph of Brit. Carb. Entomos- 



traca, part i. 1874, p. 14, pi. v. fig. 0. 



2. Beyrichia arcuata {Bean), Ann. & Mag. Nat. Hist. 1836, vol. ix. 



woodcut 55, at p. 377. 



3. subarcuata, Jones, Monogr. Foss. Estheriae, 1863, p. 120, pi. v. 



figs. 16, 17. 



4. Leperditia inflata (Murchison), " Siluria," 4th (3rd) edit. 1867, 



woodcut 83, p. 301. 



5. Candona? Salteriana, Jones, Monogr. Foss. Esth. 1863, p. 122, pL v. 

 figs. 13, 14. 



6. Cythere ? bairdioides, J. §• K., figured in present paper. 



7. Carbonia Evelina?, Jones, Geol. Mag. vol. vii. 1870, p. 218, pi. ix. 



fig. 4. 



8. Agnes, Jones, Geol. Mag. vol. vii. 1870, p. 218, pi. ix. figs. 6-10. 



9. ? sp., Jones, Geol. Mag. vol. vii. 1870, p. 218, pi. ix. fig. 5. 



10. fabulina, J. §• K., figured in present paper. 



11. Rankiniana, J. §• K., figured in present paper. 



12. scalpellus, J. fy K., figured in present paper. 



13. secans, J. ty K., figured in present paper. 



14. pungens, J. Sf K., figured in present paper. 



15. Estheria Adarusii, Jones, Geol. Mag. vol. vii. 1870, p. 217, pi. ix. 



figs. 1, 2. 



16. striata (Miimter), and vars., Monogr. Foss. Estherise, 1863, p. 23, 



pi. i. figs. 8-18. 



17. tenella (Jordan), Monogr. Foss. Estherise, p. 31, pi. i. figs. 26, 



27, &c. 



18. Leaia Leidyi (Lea), and var. Williamsoniana, Jones, Monogr. Foss. 



Estheria?, p. 115, pi. i. figs. 19, 20, pi. v. figs. 11, 12; and Geol. 

 Mag. vol. vii. p. 219, pi. ix. figs. 11-14. 



EXPLANATION OF THE PLATES. 

 Plate II. 



All the figures magnified 25 diameters, except 9 and 10, which are 

 more highly magnified. 



Fig. 1. Carbonia fabulina: left valve. Millburn, Campsie. 



Fig. 2. The same : right valve, showing muscular spot. Craigenglen. 



