Conchifera. 197 Mactra. 



angulata, Sow. G. T. vol. iv, pi. 16, f. 9. E. U. G. 



Araucana, d'Orb. Yoy. Astrol. pi. 5, f. 2-4. Chili. G. 



Carteroni, d'Orb. P. F. 367, 368, 6-9. E., Fr. N. 



Chiliensis, Gabb, 1860, Proc. Acad. 198, 3, 5. Chili. G. 



Cecileana, d'Orb. Am. Merid. 126, 15, 5-6. Chili. G. 



Dupiniana, d'Orb. P. F. 367, 368, 3-5. Fr. N. 



formosa, M. & H. 1856, Proc. Acad. 271. Neb. G. 



Gaultina, P. & R. Env. Genev. 407, 29, 3. Fr. G. 



gracilis, M. & H. 1860, Proc. Acad. p. 179. Neb. G. 

 intersecta, Forbes, Sp. (Carduim), d'Orb. Prod. 235. India. G. 



Matronensis d'Orb. P. F. 366, 368, 1-2. Fr. N. 

 porrecta, Gain. Quader. G. 



Siouxensis, M. & H. 1860, Proc. Acad. 179. Neb. G. 



substriata, d'Orb. Prod. 75. E. N. 



Texana, Con. 1856, Proc. Acad. p. 269. Tex, G. 

 tripartita. Sow. in Forbes, G. T. vol. vii, 142, 15, 17. India. G. 



Warrenana, M. & H. 1856, Proc. Acad. p. 271. Neb. C. 



Mactromya, Ag. 1842. 

 Goulonij Ag. (DoNACiLLA), Etud. Crit. 195, 10, 6-14. 



MERETRIX, Lam. 1799 (Cytherea, Lam. 1805). 



Deweji, M. & H. (Cytherea), 1860, Proc. Acad. p. 185. Neb. G. 



juunda, Duj. Sp. " Gal 



lineolata. Sow. Sp. " '^ 



Leonensis, Con. Sp. " ** 



Lamarensis, Shum. Sp. " '' 



Missouriana, Morton, Sp. (Cythen 



Nebrascensis, M & H. Sp. " 



orbiculata, M. & H. " 



185. Neb. 

 Owenana, M. & H. " 



pellucida, M. & H. " 



subrotunda. Sow. Sp. " 



therefore bears date 1767. It was, however, very much wider in its range than 

 when, in 1799, Lamarck restricted it to the true Madras. But, in 1778, Hum- 

 phreys applied the name Trigonella to the genus. Still, Linnaeus's name being 

 the oldest, must be retained under the more restricted sense, and thus Tri crone/ la 

 becomes a synonym. 



