Marylaxd Geological Survey 535 



Klctidenella tuegida Ulrich and Bassler 

 Plate XCVIII, Figs. 4-G 



Kladenia pennsylvanica Jones, 1889 (part), Amer. Geol., vol. iv, p. 341, figs. 



8, 9 (not figs. 5-7). 

 Klocdenella turgida Ulrich and Bassler, 1908, Proc. U. S. Nat. Mus., vol. xxxv, 



p. 318, pi. xliii, figs. 6, 7. 



Description. — Upon comparison of the species of Kloedenella with the 

 figures referred to K. pennsylvanica by Jones (loc. cit.), it appears that 

 three distinct forms have been included under that name. Two of these 

 belong in the Keyser limestone, while the form to which it is pro}X)sed to 

 restrict K. pennsylvanica is very abundant in the underlying Manlius. 

 K. turgida is distinguished from K. pennsylvanica, as here restricted, by 

 the strong development of the anterior sulcus. This sulcus delimits a 

 well-marked anterior lobe and produces a somewhat concentric arrange- 

 ment of the lobes behind it, the effect being quite different from the usual 

 appearance of K. pennsylvanica. 



Length of a normal right valve 1.10 mm. ; height .64 mm. ; length of a 

 short left valve .97 mm.; height .GO mm. 



Occurrence. — Helderberg Formation, Keyser ]\Iemi{er. Cumber- 

 land, Maryland ; Keyser, West Virginia. 



Collections. — Maryland Geological Sun'ey, U. S. N"ational Museum. 



Klo^dExVella turgida var. ventrosa Ulrich and Bassler 

 Plate XCVIII, Fig. 7 



Kladenia pennsylvanica Jones, 1889 (part), Amer. Geol., vol. iv, p. 341, figs. 



7a, 7b (not figs. 5, 6, 8, 9). 

 Elosdenella turgida ventrosa Ulrich and Bassler, 1908, Proc. U. S. Nat. Mus., 



vol. xxxv, pi. xliii, fig. 8. 



Description. — As noted in the remarks on A", turgida Jones's figures of 

 K. pennsylvanica are thought to include specimens of three distinct 

 species. The form now under consideration is more like K. pennsylvaniai 

 s. s. in lobation of the valves than K. turgida, being without a well-marked 

 anterior sulcus, but in the less elongate form and general aspect it is so 

 like the latter that it has been placed as a variety of this species. Its main 



