No. 4.] 



DANA — ON THE tACONTC. 



479 



ii'i 



'I' 



H 



oV^ Stenotiieca PAUPER, spec. nov. 



Deseription. — Shell small, conical, with the apex incurved, 

 laterally compressed. Aperture ovate, elongated in tlie plane in 

 which the curvature of the apex crcurs. Surface with four or 

 live small engirdling convex ridges. Length of aperture about 

 1^ lines; width about 1 line; height of shell about 1 line. 



Occurs in the red limestone at Bridgus, Conception Bay. 



In the Quar. Jour. Geol. Soc. of May last, Mr. llicks has de- 

 scribed and figured, under the name of Stmotheva cornucopia, a 

 small shell which is evidently congeneric with this. To the same 

 geuus should perhaps be referred the shell known as Metoptoma 

 rugosa of the Lower Potsdam ? of New York. '■ v/.;!'^ • 



c,ii: SCENELLA RETICULATA, gen. and spec. nov. , , 



Description. — Shell small, almost uniformly depressed, conical ; 

 apex central or nearly so ; an obscure carina extending from the 

 apex down one side to the margin. Aperture nearly circular, 

 apex very slightly incurved towards the side opposite the cariiia. 

 Surface reticulated with fine radiating and engirdling strise, just 

 visible to the naked eye. Diameter of the aperture of the largest 

 specimen collected, 3 linos ; height of the apex, 2 lines. , 



Occurs at Topsail Head, Conception Bay. 



Species resembling this have been heretofore referred to Capii- 

 his, Mftoptomn, &c., to which, however, they do not belong. For 

 the present I propose to refer those with a strongly corrugated 

 surface to Stenotfipcit, and the others with a smoother surface to 

 Scenella. • ' • u< '-'■^•'- '' '^^ ^ '" ' ' ' ' ' 



^ ■,,,,, ,..,: I {To he Continned.) 



WHAT IS TRUE TACONIC ? , 



By Prop. James D. Dan.i. 

 The true use of the term Taconic should be learned from Prof. 

 Emmons's first application of it when he juade his formal an 

 nouncement of the " Taconic .system." In Ids fin;il Now York 

 Geological Report, 4to.. 1842, the rocks so-called are those of the 

 Taconic mountains, on the borders of Massachusetts and New 

 York, together with the quartzite, limestone, and slates adjoining 

 on the east,* and not the slates far west of these mountains ; f 



• Prot'esaor Emmons opens tin; subject of the <' Taconic JSyKteni " 

 in liis final Kcpoit (1842) t)y Kayinjr tliat it extends nortli tliioufjii 

 Vermont to Queljec, and soutii into Connecticut; but tlie <iniy roclts 

 Le describes as the rocks ut the system are those of Berlishire County, 



