156 AMERICAN JOURNAL 



The Paleozoic LinguJce may have belonged to the same genus 

 as the recent forms, but it is very probable that many, if not all 

 of them, did not ; as we find granulated, radiately striated and 

 otherwise ornamented forms, which differ entirely in this respect 

 from the living Lingidoe^ the outline of many of the older species 

 also being rounded triangular, and some of them were provided 

 in the neural valve with a sharp elevated mesial septum ; these 

 features do not characterize the recent species. The other re- 

 cent species of Lingula are as follows : 



Lingula ovalis, Rve., P. Z. S. 1841, p. 100. 



Ilab. Sandwich Islands. 



Lingula tumidula, Rve., P. Z. S. 1841, p. 100. 



ITab. Moreton Bay, Australia. Japan. 



This species, judging from the figure in the Conch. Iconica, 

 differs materially from the other species there figured, in the 

 broad form, emargination of the beaks and the size and position 

 of the muscular impressions. A variety (?) compressa is found 

 in the Philippines. 



? Lingula Murpliiana, King, Rve., Conch. Icon. pi. i, fig. 3, 



1861. 

 Hab. ]Moreton Bay, Australia. 

 This species (?) much resembles L. anatina. 

 Lingula liirundo, Rve., Conch. Icon. pi. ii, fig. 7, 1861. 

 Hab. Port Curtis, North-east Australia. 

 Lingula exusta, Rve., Conch. Icon. pi. ii, fig. 9, 1861. 

 Ifab. Moreton Bay, Australia. 

 Lingula Mans, Swains, Zool. 111. vol. ii, pi. ii. 

 Hab. China Seas. 



Lingula smaragdina, A. Ad., An. and Mag. Nat. Hist. 1863, 



p. 101. 

 Hab. Yobuko, Japan. 



Lingula j asp idea, A. Ad., An. and Mag. Nat. Hist. 1863, p. 



101. 

 Hab. Mososeki, Japan. 



Lingula lepidula, A. Ad., An. and Mag. Nat. Hist. 1863. p. 



101. 

 Hab. Seto Uchi, Japan. 



