498 
MR. H. N. RIDLEY ON THE 
48. Semele cordieormis, Chemnitz. 
1766. Telliua reticulata, Linnet, Syst. Nat. ed. 12, p. 1119. 
1795. Telliua 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. Amphidesma orbiculata, Say, Journ. Acad. Nat. Sci. Philad. 
vol. ii. p. 307 ; Reeve, f. 13. 
1826. Amphidesma radiata. Say, l. c. vol. v. p. 220 ; Reeve (as of 
Riippell), f. 12. 
1832. Amphidesma lenticularis, Sowerby, Proc. Zool. Soc. 1832, p. 200; 
Con. III. f. 9; Reeve, f. 39. 
1841. Amphidesma reticulata, Sowerby, Con. Illust. p. 8; Reeve, f. 29. 
1841. Amphidesma snbtruncata , Sowerby, l. 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, l. c. p. 95 ; Reeve, f. 42. 
1853. Semele modesta, A. Adams, l. c. p. 95 ; Reeve, ff. 35 a-b. 
1853. Amphidesma cordiformis. Reeve, Con. Icon. f. 30. 
Hah. West Indies, Bermuda, Fio 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. subtruncata, S. luteola, and S. modesta, 
also the specimens figured by Peeve, I am inclined to believe that 
al^ 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 thiuk, 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 
rocks ; but the surfaces are so eroded and water-worn, that it is 
impossible to determine them. 
