28 



1818 vulgaris Reeve China (2 Ex), 



19 Cyprina islandica L. 



20 Astarte semisulcaia Leach. 21 compressa L. 

 22 sulcata DC* 23 crebricostata Forb* 



24 stnata Leach. 25 castanea Say* 



26 Area occidentalis Phil, 27 umbonata Lm. 



28 arabica Mus, Frcf. 29 domingensis Lm. 



30 ' fusca Brng. 31 Listen Phil. 32 Candida Helb. 



33 foliala Forsk 34 torta Stp* 4 Ex. 35 sp. 



36 (Scapharca) indica Gm. 37 inaequivalvis Ch* 



38 Candida Helb. 



39 (Anadara) nolabilis Bolt. 40 scapha Meu* 4 Ex. 



41 granosa L. 



42 (Senilia) senilis L, Guinea* 



43 Axinsea (Pecluriculus) violascens Lm, 



44 decussata L. 45 mulabilis Ch. (sicula R.) 

 46 peelinata Gm* 47 pectunculus L. 



48 Solenomya solen Marschl* 



49 Nuculana pernuJa Mull. 50 buccata Stp. 



51 minuta Mull. 



52 Nucula tennis Gray* 



53 Hyria (Triquetra) obliquaSch. 54 var? valv. solit* 



55 Unio (Truncilla) triquetra Rf. 



56 (Orthonymus) cylindricus Say* 



57 (Quadrula) metanever Rf* 58 quadrula Rf. 

 59 (Pleurobema) cordala. 60 ebenus Lea* 



61 trigonus Lea. 



62 (Crenodonla) plicatus Say, 



63 (Metaptera) megaptera Rf. 64 gracilis Rf* 



65 (Lampsilis) crassus Say, 66 virginianus Lm, 



67 radiatus Lm. 68 Elliptic dilatatus Rf. 



69 (Mysca) Liebmanni Phil. 



70 aztecorum Phil. Mexico. 



71 (Nai'a) corrugata Miill. 



72 testudinarius Spgl* J, or. 



73 (Trilogenia) verrucosa Rf* 



74 (Complanaria) complanata Bar. 75 var. 

 76 Margaritana margaritifera L, 



