PALAEOZOIC. 



GASTEROPODA. 



CAMBRIAN AND SILURIAN. 



CAMBRIAN. LOWER SIL. 



UPPER SILURIAN. 



SPECIES. 



Selicololna Salter, 1856 



HALIOTID.B. 

 Holopea* Hall, 1842... 



— carinata Forbes 



— coucinna M'Coy 



— eonica Forbes 



i 



— constricta M'Coy 



— exserta Forbes 



— lymnaxudes Forbes 



— striatella Sow. .. 



TURRITELLID^:. 



Holopella M'Coy, 1852 ... 



Turritella (part) 



— cancellata Sow 



— eonica Sow. 



— gracilior M'Coy 



— gregaria Sow. .. 



intermedia M'Coy 



monile M'Coy 



obsoleta Sow. ... 



— plana M'Coy 



— tenuicincta M'Coy 



Sormotoma Sail . 



Litorinidj:. 

 Litorina Ferrusac, 1821 



— corallii Sow 



— octavia M'Coy 



— undifera M'Coy 



PYBAMIDELLID.2B. 

 Loxonema Phillips, 1841., 



— elegans M'Coy 



— obseura 



— sinuosa 



Portl. 



Sow. 



HEFERENCKS. 



Vide Ophileta. 



HOLOSTOMATA. 



* The genera Holopea, Holopella, Cyclouema, &c. are so 

 closely allied that it is difficult to separate them. 



MSS. Salt. Mem. Geol. Surv. vol. iii, p. 348, woodcut, p. 347, 

 No. 14, f. 4. 



Natieopsis, Synop. Sil. Foss. Irel. p. 13, 1. 1, f. 10. Holopea, 

 Siluria, 4 ed. p. 197, Foss. 40, f. j. 



MSS. Salt. Mem. Geol. Surv. vol. iii, p. 347, woodcut, No. 14, 

 f. ?. 



Troehus, Brit. Pal. Foss. p. 296, 1. 1 K, f. 41. 



MSS. Salt. Mem. Geol. Surv. vol. iii, p. 347, woodcut, No. 14, 

 f. 1. 



MSS. Salt. Mem. Geol. Surv. vol. iii, p. 347, woodcut, No. 14, 



f-3- 

 Litorina, Sil. Syst. p. 612, t. 19, f. 12. Holopea, Siluria, 



4 ed. t. 7, f. 4. Troehus constrielus, M'Coy, Brit. Pal. 



Foss. p. 296, 1. 1 K, f. 41. 



HOLOSTOMATA. 



Turritella, Sil. Syst. p, 642, 706, t. 20, f. 18. Murchisonia 

 polyglypha, Phill. Mem. Geol. Surv. vol. ii, pt. 1, p. 357, 

 t. 14, f. 3. Holopella, Siluria, 4 ed. 1. 10, f. 14, p. 90, 

 Foss. 15, f. 8. 



Turritella, Sil. Syst. p. 604-706, t. 3, f. 7, 8. Holopella, 

 Siluria, 4 ed. t. 34, f. io, t. 35, f. 26. 



Brit. Pal. Foss. p. 303, 1. 1 K, f. 33. 



Turritella, SiL Syst. p. 603, t. 3, f. 1. Holopella, Siluria, 

 4 ed. t. 34, f. 10 ; ib. M'Coy, Brit. Pal. Foss. p. 303. 



Brit. Pal. Foss. p. 304, 1. 1 L, f. 16. 



Brit. Pal. Foss. p. 304, t. 1 K, f. 32. 



Turritella, Sil. Syst. p. 603, 706, t. 3, f. 7. Holopella, 

 Siluria, 4 ed. t. 9, f. 28; 1. 10, f. 14, t. 34, f. 11. 



Turritella, Synop. Sil. Foss. Irel. p. 12, 1. 1, f. 6. 



Brit. Pal. Foss. 1. 1 L, f . 1 7. 



Vide Murchisonia. 



HOLOSTOMATA. 



Vide Cyclonema. 



HOLOSTOMATA. 



Brit. Pal. Foss. p. 302, 1. 1 K, f. 34. 



Vide Murchisonia. 



Terebra. Sil. Syst. p. 619, t. 8, f. 15. Loxonema, Siluria, 

 4 ed. t. 24, f. 3. 



112 



