ANATINA.— Plate IV. 



posterior side being short, constrictedly beaked and pouted, 

 but not anailed. 



Species 37. (Mus. Cuming.) 



Anatina LiMicoLA. Anal, tedii subaquilateraU, cylin- 

 draceo-oblongd, argenteo-hijaUnS, lavigatd, latere poli- 

 tico abrupte truncalo, ampl'der hiante, antico latiore, 

 tiimido, rotundato, parmn hiante. 



The mud-dwelling Anatina. Sliell nearly equilateral, 

 cylindrically oblong, silvery hyaline, smooth, posterior 

 side abruptly truncated, largely gaping, anterior side 

 broader, swollen, rounded, but little gaping. 



Hab. Japan. 



Closely allied to A. truncata, of the Philippine Islands, 

 and equally abundant, perforating the mud in all direc- 

 tions. 



Species 28. (Mus. Cuming.) 



Anatina gracilis. Anat. elongnto-pyriformi, teiiuissimd, 

 hyalind, concentrine striato-liratd, latere postico con- 

 stricto-rostrato, rostro atlenuato-producto, antico tu- 

 mido-expanso, rotundato. 



The slendee Anatina. Shell elongately pear-shaped, 

 very thin, hyaline, concentrically striately, ridged, 

 posterior side constrictedly beaked, beak attenuately 

 produced, anterior tumidly expanded, rounded. 



Hab. Port Curtis, Australia. 



A very thin, transparent shell, remarkable for the at- 

 tenuated prolongation of the beaked posterior side. 



Species 29. (Mus. Cuming.) 



Anatina argentea. Anat. testd ovatd, tenia, lavigatd, 

 argented, hyalind, latei'e politico constricto-attenuato, 

 vix rontrato, modici hiante, antico rotundato, pariuu, 

 hiante. 



The silvery Anatina. Shell ovate, thin, smooth, silvery, 

 hyaline, posterior side constrictedly attenuated, scarcely 

 beaked, moderately gaping, anterior side rounded, 

 but little gaping. 



Hab. ? 



This species difl'ers from all others in ha\ ing the posterior 

 side constrictedly attenuately produced, with very little 

 inclination to become beaked. 



Species 30. (Mus. Cuming.) 



Anatina EXIMI.^. Anat. testd ovatd, cnrvatd, tenui, hya- 

 lind, circa umbones eximie plicatd, latere postico c.on- 

 stricto-attennato, rostrato, hiante, maryinibus sub- 

 expansis, antico arcuato-rotundatu, modici hiante. 



The delicate Anatina. Shell ovate, curved, thin, 

 hyaline, neatly plicated round the umboes, postei-ior 

 side constrictedly attenuated and beaked, gaping, 

 mai'gins a little pouted, anterior side arcuately 

 rounded, moderately gaping. 



Hab. ? 



An elegantly curved shell, attenuately beaki-il on the 

 posterior side, with the margins a little pouted. 



