LiEDA.— Plate I. 



The glorious L^da. Shell oblong-luuceolate, whitish, 

 rather solid, inequilateral ; posterior side at- 

 tenuated, elongated, compressed, rostrated, rather 

 rounded at the end, concentrically wrinkled at 

 dorsal margin. 

 A. Adams. (Yoldia) Proc. Zool. Soc, 1856, p. 226. 

 Hah. Singapore. 



With the general form of the lanceolate group this 

 species combines a certain inequality of sides, the 

 posterior being elongated and tapering, and tlie an- 

 terior swelled and broad. 



Species 4. (Mus. Brit.) 

 L.fflDA ELONGATA. Lced. tcstd lanccolatd, cmnpressd, suh- 

 cequilaierali, oblique siriatd, epidennide valido in- 



diild, utrinqm subrostratd, rostris obtusis, murcjine 

 ventrali prope terminos vix concavo ; margine dor- 

 sali titrinque recto, areis dorsalibus lcevi</atis siib- 

 depressis. 



The elong.\ted LjE1)A. Shell lauL-eolate, compressed, 

 subequilateral, obli(juely striated, covered with a 

 strong epidermis, subrostrated at each end ; beaks 

 obtuse, ventral margin scarcely concave near the 

 ends ; dorsal margin straight on both sides : dorsal 

 areas smooth, subdepressed. 



Sowerby. Proc. Zool. Soc, 1832, p. 197. 



Hah. Salango, West Culumbia. 



Tlie concavity in the ventral margin is not nearly so 

 conspicuous in this species as in the more giacefully- 

 formed Loeda Soivei-biunu. 



