498 



MR. H. N. RIDLEY ON THE 



48. Semele cordieormis, Chemnitz. 



1/66. Tellina reticulata, Linnel, Syst. Nat. ed. 12, p. 1119. 

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

 ff. 1941-2. 



1815. Tellina decussata. Wood, Gen. Conch, p. 190, pi. 43. figs. 2, 3. 



1822. Amphidesraa orbiculata, Say, Journ. Acad. Nat. Sci. Philad. 

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



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

 Rilppell), f. 12. 



1832. Amphidesma lenticularis, Sowerby, Proc. Zool. Sac. 1832, p. 200; 

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



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



1841. Amphidesma snhtvnncata, Sowerby, I. c. p. 7- 



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

 vol. ii. p. 10. 



1853. Semele sinensis,^. 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 cordiforrais. Reeve, Con. Icon. f. 30. 



Hah. West Indies, Bermuda, E/io Janeiro, Ascension Island, 

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



Having carefully studied a large series of specimens from the 

 above localities, the types of >S'. lenticularis, said to have been 

 obtained in West Colombia, also the types 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 8. 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 

 rocks ; but the surfaces are so eroded and water-worn, that it is 

 impossible to determine them. 



