626 APPENDIX. 



Vol. i. p 342. Genus NEMATURA. 



This name having been previously used by Fischer for a genus 

 of birds, Mr. Benson, at our suggestion, has altered it to Steno- 

 thyra, the species of which will stand as follows. 



cingulata, Bens. minima, Sow. 



coarctata, Lea. monilifera, Bens. 



Deltse, Bens. poiita, Sow. 



foveolata, Bens. puncticulata, A. Adams. 



frustillum, Bens. strigilata, Bens. 



glabrata, A. Adams. ventricosa, Quay and Oalm. 



Genus PETALOCONCHUS, Lea. 



(Fam. VERMETID.E.) 



Animal unknown. 



Operculum small, very thin, horny, smooth, somewhat flat, 

 scarcely spiral. 



Shell externally similar to that of Bivona, internally very 

 rarely with transverse septa ; the median whorls with elongated 

 spiral laminae variously disposed, generally two larger ones, and 

 a third smaller, as if representing a columellar plica. 



Ex. P. nerinseoides, Carpenter, pi. 137, fig. 10. 



Species of Petaloconchus. 

 cereus, Cpr. nerinseoides, Cpr. 



cochlidium, Cpr. octosectus, Cpr. 



flavescens, Cpr. renisectus, Cpr. 



macrophragma, Cpr. varians, D'Orb 



Vol. i. p. 355. Fam. CiECLTLE. 



In an elaborate and able monograph of this family, Mr. P. P. 

 Carpenter proposes the following arrangement. 



