90 BuivLKTiN 31 90 



this species is founded are undoubtedly young ; the crenations do not ap- 

 pear on their margins, though well-developed on the fragment. It is not 

 the young of any known species and it is highly probable that its remark- 

 able compression is not materially altered in the adult. 



The dentition of this species is exactly that of Lirodisais 

 when excessively compressed. The longish, external ligamental 

 groove is well marked in our specimen and apparently so in Mc- 

 Connell's drawing of the same for Dall, as quoted in the synon- 

 ymy above. It seems within the range of possibility that this 

 may be near the obscure and fragmental C. palmula Con (Amer. 

 Jour. Sci., vol. I, 1846, p. 396, pi. 4, fig. i.) 



Horizon. — St. Maurice stage of the Eocene series. 



Localities. — Wautubbee and Mr. Johnson's place, Miss. 



Lirodiscus protractus (Meyer), PI. 32. Figs. 2, a, 3? 



Astarte protrada Meyer, Bull, i, Geol. Surv. Ala., 1886, p. 80, pi. 3, 



figs. 18, 18 a. 

 ? Lirodiscus protractus Dall, Trans. Wag., Ill, 1903, p. 1484, pi. 43, 

 ^- fig- 3- 



Meyer'' s original description. — Elongated, subquadrangular, umbon- 

 ial part strongly flattened ; adductors prominent ; surface covered with dis- 

 tant concentric ribs, becoming obsolete on the umbonial part ; margin en- 

 tire. 



Locality. — Enterprise, Miss. 



The single specimen was collected by me in the stratum, in Enter- 

 prise mentioned Am. Jour. Sci., XXX, p. 70, as upper bed. 



So far we have found no recognizable specimens of this 

 species. 



The relationship of the Sabine (Woods Bluff) form as here- 

 with shown — fig. 3 — to smithville7isis ox protractus is still in an 

 unsettled condition. 



Lirodiscus tellinoides Con., PI. 32. Figs. 4-1 1. 



Astarte tellinoides Con., Am. Jr. Sci., vol. 23, 1833, p. 342. 

 A. nicklinii Lea, Cont. to Geol., Dec. 1833, p. 61, pl. 2, fig. 35. 

 A. sulcata Lea, Cont. to Geol., 1833, p. 62, pl. 2, fig. 36. 

 Lirodiscus tellinoides Con., Am. Jr. Conch, vol. 5, 1869, p. 47. 

 Astarte nicklinii deGreg., Mon Faun. Eoc. Ala., 1890, p. 199, pl. 



27, figs. 6-18. 

 Lirodiscus tellinoides Dall, Trans. Wag., Ill, '03, p. 1483. 



