258 



Obtained in great abundance from the dark shales of the Devo- 

 nian of Erere, in various stages of growth, with Lingula Monte- 

 Alegrensis, etc. (Morgan Expeditions 1870 and '71.) 



Though only six specimens of Lingula were obtained at Erere, 

 these appear to represent, at least, four determinable species, one of 

 which may prove to be identical with Lingula spatulata of the 

 Genesee shale, New York, while the others seem to be new to science. 



Ling'ula spatulata 1 Fig. 1. 



Lingula spatulata. Hall and Van., Geol. Keps., 3d and 4tli Districts 



New York, 1842 and '43. 

 Lingula spatulata, Hall, Pal. N. Y., Vol. IV, p. 13. 



The only specimen of this species found at Erere, consists of a single valve, 

 which is small and half as wide as long. The strongly rounded front, and 

 sub-parallel, nearly straight, lateral margins, forming a somewhat 

 elliptical outline. The posterior third of the valve is angular, 

 the margins being inclined towards one another at an angle of 

 about 70 degrees. Being defective at the apes, it is impossible to 

 ' ' determine the original form of the beak, though it was probably 



acuminate and strongly elevated. The valve is very convex, flat- 

 tened toward the front, from which it rises gradually nearly to the beak, 

 toward which it slightly declines. In the front and middle the valve curves 

 regularly from side to side, but, toward the beak, it becomes very slightly 

 subangular along the median line. 



Faint traces of the substance of the test appear to be preserved, and the 

 lines of growth are indistinctly visible. Length 9 m. m., width 4.5 m. m. 



Although this specimen of Lingula is much larger than the spe- 

 cimens of Lingula spatulata from New York, yet the outline is so 

 nearly the same, that it does not seem possible to separate the Erere 

 form from the New York forms, more especially since a variety of 

 Lingula spatulata has been obtained from the West, which is much 

 larger than the one from New York. 



This is the only species of Lingula yet detected in the Devonian 

 sandstone at Erere, where it was found associated with Spirifera 

 Pedroana, etc. It is readily distinguished from the species of the 

 underlying dark Discina shale by being more angular posteriorly. 

 (Morgan Expedition 1871.) 



