TRIGONACEA. 55 



58. N. serotina, Hinds, Pro. Zool. Soc. IS^^. 



59. N. striata, Sowerbt/, Conch, Illus. no. 21. f. 16. 

 €0. N. Tellinoides, Sowerby, Genera, no. 17. f. 2. 



Area Tellinoides, Wood. 



61. N. tenella, Hinds, Pro. Zool. Soc. 1844. 



62. N. tenuis, Turton, Brit. Biv.p. 177. 



Area tenuis, Montagu. 



63. N. throcaeformis, Storer, Boston Journ. v.2; Gould, Mass. f. 66. 



64. N. tumida, Hinds, Pro. Zool. Soc. 1844. 



65. N. ventricosa, Hinds, Pro. Zool. Soc. 1844. 



Family XI. TRIGONACEA. 



Genus I. TRIGONIi\, Bruguiere. 



1. T. pectinata, Lamarck, Ann. du Mus. v. 4. p. 355. pi. 67. 

 Trigonia margaritacea, Lamarck ; 

 Chama pectinata. Wood. 



Family XII. NAIADES. 



Genus I. UNIO, Bruguiere. 



1. U. acutissimus, Lea, Trans. Amer. Phil. Soc. v. 4. pi. 10. f. 18. 



2. U. iEsopus, Green, Cont. of Mac. Ly. 1827. pi. 3. 



Unio cicatricosus, Conrad ; Unio varicosus, Conrad. 



3. U. alatus, Say, Lea, Obs. Unio. p. 62 ; Sowerby, Genera, f. 5. 



Mya alata. Wood ; Symphynota alaia. Lea. 



4. U. altilis, Conrad, Freshwater Shells, p. 43. pi. 2. f. 1. 



5. U. ambiguus, Lea, Sowerby, Genera, pi. 1. f. 2. 



Castalia ambigua, Lamarck ; Mya ambigua, Wood ; 

 Tetraplodon pectinatum, Spix. 



6. U. angustatus, Lea, Trans. Amer. Phil. Soc. v. 4. pi. 17. f.43. 



7. U. angustus, Lamarck, Lister's Conch.pl. 147. f. 3. 



8. U. Anodontoides, Lea, Trans. Amer. Phil. Soc. v. 4. pi. 8. f. 1 1. 



Unio teres, Conrad. 



9. U. apiculatus, Say, Amer. Conch, pi. 52. 



10. U. Arcseformis, Lea, Trans. Amer. Phil, Soc. v. 4, pi, 17, f. 44. 

 Unio nexus, Say. 



