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 spinom, Gold., Museum 

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

 tiquum, Stein., Mem. de la Soc. Geol. de France, t. i. p. 367.) 



2. — ; intermedia, nob. 



id. var. a. 



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



4. excavata. 



id. var. a. 



All these shells are widely distributed in the limestone of 

 Pfaffrath, Hagen, Iserlohn, Vilmar, Sbtenich, &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 bigranulosa, nob., Paffrath. 



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



Paffrath, Devonshire. 



6. binoalosa, 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. H), ib. 



1 1 . tceniata, nob. (Turritella, id., Phill.Geol. of Yorksh., 



pt. 2, pi. 16, fig. 7), Bolland (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 different species will 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. • 



