62 J. M. Clarke — Clymenia in Western JVew York. 



Lunylicardium not dissimilar from an unidentified form of 

 this genus known to me from the Enkeberg. These are, how- 

 ever, molluscan types, occurring with, but not especially char- 

 acteristic of the Clymenia fauna. Closer comparisons must 

 await the fuller elucidation of our Intumescens-fauna, as a large 

 number of its known species are yet undescribed. 



It may be provisionally suggested that the fauna of the 

 Naples beds embraces representatives of the whole series of 

 the European Upper Devonian faunas from the base of the 

 Goniatite limestone to the base of the Culm ; that it is, there- 

 fore, a condensed time- equivalent of a series highly differen- 

 tiated in the transatlantic Upper Devonian succession. There 

 the indicial brachiopods, Sjpirifer disjunctus, Orthis stria- 

 tula, Rhynchonella acuminata, range through the entire series ; 

 here the Intumescens-fauna at least, is almost entirely without 

 representatives of these species, their allies or associates.* On 

 the other hand, in rare instances, the members of the cephalo- 

 pod or deep-sea facies of the lower Upper Devonian fauna are 

 found in the succeeding brachiopod fauna ; for example, Gon- 

 iatites intumescens, G. sinuosus (=G. intumescens), G. simu- 

 lator ( — ? G. intumescens) and G. Chemungensis. 



Tschernyschew has foundf these index brachiopods of the 

 Upper Devonian in the Clymenia beds of the Urals (Horizont 

 von Mursakaeva), and Hehert at an earlier date reported Cly- 

 menia with Spirifer disjimctus and Orthis striatida in the 

 Ardennes near Etrceungt.:}: 



EXPLANATION OF FIQURES. 



Clymenia Neapolitana, sp. nov. 



A nearly complete shell, slightly broken at the aperture, x 4. 

 Profile of the same; showing the broad ventrum and recurved strias. 

 Transverse section near the beginning of the 5th whorl, x 6. 

 Transverse section at the end of the 1st, 2d, 3d and 4th whorls, x 6. 

 The form of the suture at 2\ revolutions. 

 The mature suture. 

 8 9. Three views of the protoconch. x 10. 

 Fig. 10. Ventral view of an immature shell; showing the character of the 

 spinous projections; these are somewhat restored on the left of the 

 figure, x 6. 

 Fig. 11. A mature shell, showing anodation of the ventral margin of the body- 

 chamber, x 4. The specimen is crossed by projecting seams of 

 quartz. 

 Fig. 12. The mature suture viewed from above, the dorsal course being in a 

 dotted line. These figures of the suture are not drawn to scale. 



* The only member of this fauna suggesting the brachiopod facies of the lower 

 Upper Devonian of Europe is a small Strophalosia or Productella recalling the 

 species usually identified by European writers with the Productus subaculeatus 

 Murchison. 



f Fauna des mittleren und oberen Devon am "West-Abhange des Urals, 188*7. 



% Bull, de la Soc. geol. de France. 2e ser. torn. 12, p. 1178, 1855. 



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