174 Revieus — J. M. Clarke — Clymenla in New York. 



sides and periphery, widening towards the dorsal or inner side. It 

 results from this that the section of the body-chamber is sub- 

 trapezoidal. The protoconch (Figs, a, h, c) or initial-chamber, 

 which Mr. Clarke had the good fortune to develop, is "broad, 

 transversely ellipsoidal, and has a diameter of 0"9 millimetres." 

 The flattening of the periphery just described, is not apparent 

 until the 5th and 6th whorls are attained. In these the body- 

 chamber is covered with " fine elevated, falciform striae," which 

 bend sharply forward on either side of the peripliery, upon which 

 they form a backwardly directed curve. The ornamentation of 

 the early whorls is very characteristic, and consists of a series of 

 "lamellar, spinous processes" on the margins of the periphery. 

 The dorsal (internal) position of the siphuucle was observed in 

 several instances. 



1" 



Chjmenia Neapolitana, Clarke. 



a — c, Three views of the initial-charaher (protoconch) ; d, the form of the 

 suture at 2| revolutions ; e, the mature suture. (After J. M. Clarke.) 



The form of the suture-line will be understood by referring to 

 the figures (d, e). The author compares his species with Clymenia 

 spinosa, G. binoclosa, and C. suharmata, all of Miinster. From the 

 last-named species it differs essentially in the mature suture. Its 

 resemblance to G. spinosa is shown in its having similar spinous 

 processes on the sides of the whorls in the young shell, while in its 

 suture-line and flattened periphery it is allied to G. binoclosa. 



The restriction of Clymenia to the Upper Devonian of Europe is, 

 so far as the present discovery shows, maintained in America, though 

 it occurs at a comparatively lower horizon in that formation in the 

 New World than it does in the Old. " It may be provisionally 

 suggested," observes Mr. Clarke, "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, therefore, a condensed time-equivalent of 

 a series highly differentiated in the transatlantic Upper Devonian 

 succession." 



By this important discovery Mr. Clarke has added to his reputa- 

 tion as a palfBontological investigator, and geologists no less than 

 palfeontologists will rejoice that the invertebrate fossils of America 

 now, as in past time, find such able and enthusiastic exponents. 



A. H. F. 



