498 MR. H. K. EIDLET ON THE 



48. Semele cokdieormts, Chemnitz. 



17()(). Telliiia reticulata, Linn^l, Syst. Nat. cd. 12, p. 1119. 



1795. Tellina cordiforniis, Chemnitz, Conch. -Cab. vol. xi. p. 208, pi. 199. 

 ff. 1941-2. 



1815. Tellina decussata. Wood, Gen. Conch, p. 190, pi. 43. fi{>s. 2, 3. 



1822. Aniphidesma orbiculata, Say, Jourii. Acad. Nat. Sci. Philnd. 

 vol. ii. p. 307; Eeeve, f. 13. 



1826. Amphidesma radiata, Say, I. c. vol. v. p. 220 ; Reeve (as of 

 RUppell), f. 12. 



1832. Amphidesma lenticularis, Soiverby, Proc. Zool. Soc. 1832, p. 200; 

 Con. III. f. 9 ; Reeve, f. 39. 



1841. Amphidesma reticulata, Sowerhy, Con. Illust. p. 8; Reeve, f. 29. 



1841. Amphidesma snbtruucata, Sowe?-i?/, I. c. p. 7- 



1845. Amphidesma Jayanum, C. B. Adams, Proc. Bost. Soc. Nat. Hist 

 vol. ii. p. 10. 



1853. Semele sinensis, A. Adams, Proc. Zool. Soc. 1853, p. 95; Reeve, 

 f. 28. 



1853. Semele luteola, A. Adams, I. c. p. 95 ; Reeve, f. 42. 



1853. Semele modesta, A. Adams, I. c, p. 95; Reeve, ff. 35 a-b. 



1853. Amphidesma cordiformis. Reeve, Con. Icon. f. 30. 



Hah. West Indies, Bermuda, Rio Janeiro, Ascension Island, 

 St, Helena, Cape Palmas, and Fernando Po (Brit. Mus.). 



Having carefully studied a lai'ge series of specimens from the 

 above localities, the types of 8. lenticularis, said to have been 

 obtained in West Colombia, also the tyjjes of *S'. chinensis, 

 S. reticulata (Sow.), S. suhtruncata, S. luteola, and S. modesta, 

 also the specimens figured by Eeeve, I am inclined to believe that 

 alL the above-named forms constitute but a single variable 

 species. 



Some authors have considered this species to be the Tellina 

 reticulata of Linne ; but I am rather inclined to think, with 

 Hanley, that there is not sufficient evidence to determine this 

 with any degree of certainty. The locality " China," from which 

 Adams named a form S. sinensis, I regard simply as one more of 

 the innumerable errors of " habitat " occurring in Cuming's 

 collection. 



49. Chama, sp. incert. 



Several specimens of a species of Chama were taken on the 

 I'ocks ; but tlie surfaces are so eroded and water-worn, that it is 

 impossible to determine them. 



