Ling. 



346 



Lingula oblata, Hall. Keport on Fourth district of New 

 V .^^ York, page 76, fig. 18, 8. Clinton. Shell wide ; sur- 

 face covered with concentric lines or slight folds, 

 stronger at the margins ; whole surface finely striated. 

 Ig *— ^ These two series of lines distinguish it from the al- 

 lied Lingula perplexa. — V a. 

 Lingula oblonga (dintoni). Hall, 1843, p. 77, fig. 19, 4. 



Vanuxem, page 79, fig. 11, 4. Rogers, p. 

 823, fig. 629. Hall, plate fig. 9, 4. 

 (Conrad An. Rt., N. Y. 1839). Cli7i- 

 ton formation. — Occurs in lime shales 

 over Ore sandstone (among other Clin- 

 ton forms); Claypole, specimen 60 

 (five) at Waggoner's mill, near Center. Perry Co. Va. — 

 Note. G. B. Simpson finds what seems to be a Lingula ohlonga 

 (not good enough to draw) as Spec. 204-34, in Fellows' collec- 

 tions from the Reedsville mill-dam, Mifflin Co., Pa., in Black 

 Hiver or Trenton limestone. — // c. 



Lingula obtusa, Hall. Pal. N. Y. Vol. 1, 1847, Irenton. 

 lEc- --**- "-' "jm^ih. Emmons, Am. Geol. 1, ii, p. 202, plate 8, 



fig. 7a, 7& ; shell ovate, sides rounded and 



curving toward a blunt beak, projecting 



beyond the hinge ; rays and contrentric 



Etn AGj85i Pf.a lines extremely fine. — Trenton LI c. 



Lingula papillosa, Emmons. American Geology, Vol. 1, 



'no.^.^^^64. part 2, page 202, fig 64; surface covered with fine 



pimples (papellae), and striated with faint ray lines 



two smooth furrows down the middle. — Trenton 



j^pSi^^^P'ib limestone. lie. 



Lingula perplexa (elliptica). Hall, 1843, page 76, fig. 18, 7. 

 Clinton. (Name preoccupied by Phillips in 1836 and 

 changed by Hall in 1877. S. A. Miller.) The concen- 

 tric lines on the shell are scarcely raised at all. — It is 

 remarkable that L. acutirostris^ L. perplexa and Z. 

 oblata are found together at one place (in the shales 

 of the Wolcott ore bed in New York), the first and last in con- 

 siderable numbers. The rule is that one species of Lingula 

 alone is found at any one place., however numerous the indi- 

 viduals mnr bp. (Hall. p. 77.) — V a. 



