282 M, D'Archiac on the Genus Murchisonia, 



The species composing the genus Murchisonia, such as we 

 have here restricted it, are, as far as we know at present, the 

 following : — 



1. Murchisonia spinosa, nob. (Turritella spinosa. Gold., Museum 



of Bonn ; Buccinum spinosum, Sow., pi. 566, fig. 4 ; Cerith. an- 

 tiquum, Stein., M^m. de la Soc. Geol. de France, t. i. p. 367.) 



2. — intermedia, nob. 



id. var. a. 



3. hilineata (Turritella bilineata, melania, id. Gold.), f 



4. ■ excavata. !-> 



id. var. a. a. 



All these shells are widely distributed in the limestone of 

 Pfaffrath, Hagen, Iserlohn, Vilmar, Scitenich, &c. M, spinosa 

 is found in Devonshire, in deposits of the same age. M. ex- 

 cavata is likewise found in the carboniferous limestone of 

 Vise (Belgium), and the rest in the limestone of Nehou and 

 Ize, near Vitre, in the departments of Manche and lle-et- 

 Vilaine. 



5. Murchisonia higranulosa, nob., Pafirath. 



id. var. {Turritella abbreviata. Sow., pi. 565, fig. 2), 



Paffrath, Devonshire. 



6. binbdosa, nob., Lustheide *. 



7. cingulata, nob. {Turritella cingulata, Hisin. pi. 12, 



fig. 6), Sweden. 

 8. articulata, nob. {Pleurotoma, id., Murch. Sil. Syst. 



pi. 5, fig. 25), Ludlow Rock. 

 9, .„ Corallii, nob. {Pleurotoma, id., Murch. ib. pi. 5, 



fig. 26), ib. 

 10. Lloydii, nob. (Pleurotomaria, id., Murch. ib. pi. 8, 



fig.l4),ib. 

 11. tceniata, nob. (Turritella, id., Phill. Geol. of Yorksh., 



pt. 2, pi. 16, fig. 7), BoUand (mountain limestone), Gronau. 



12. ' tricincta, nob. {Schizostoma, id., Munst., pi. 15, 



fig, 14), Elbersreuth. 



id. var. a, nob., Vilmar. 



. id. var. b, Bas-Boulonnois. 



13. — fusiformis, nob. (Pleurotomaria, id., Phill., pi. 15, 

 fig. 16.) 



• These diiFerent species vn& be described and figured in a * Memoir on 

 the Fossils of the ancient formations of the neighbourhood of the Rhine,' on 

 which M. Verneuil and myself are engaged at present, and which will ap- 

 pear in the next volume of the Transactions of the Geological Society of 

 London. 



