-o^ 9 €-o- 



M. 



Pallium, Reeve. 

 * Parcipictus, do. 



■; Pectenoides, Deshs. 



Wt ■ Pectiiiatus, iiinrk. 



W — ^ectiuiformis, do. 



Pennaceus, do. 



Pilosns, do. 



Radialis, do. 

 Roseus, Reeve. 

 Rüben.s, Lmrk. 



Scriptus, do. 



Sericatus, Reeve. 

 Öiculus, do. 

 Spadiceus, do. 

 Striatularis, Lmrk. 

 Tellinaeformis, Reeve. 

 Tenuicostatuy, do. 

 Tesselatus, Sow. 

 Violascens, l..mrk. 



Nucula 'J 



JeefA- Buccata, Möller. 



Decussata, Sow. 



Delphinodonta, Mighels 



Flnviatilis, Sow. 



Hyperborea, l^oven. 



Laevis, Say. 



Limatula, do. 



Idem, do. 



Margaritacea, l.,iurk. 



y,, — Miüuta, Turt. 



Obliqua, Lmrk. 



Pella, do. 



Proxima, Say. 



Rostrata, Müller. 

 ...fc^ Tennis, Montag. 



v.Tri'jünia - 



Lamarcki, Gray. 



— -^ Pectinata, Lmrk. 



Castalia / 



Ambigua, Lmrk. 

 Inflata, d'Orb. 

 Sulcata, Kranss. 



Uniü /or 



— Aesopus, Green. 

 — -Alatus, Say. 



Amnicus, Ziegl. '' 



Angnlatus, Lea. 



Anotondoides, do, 



Aplata, Swaius. 



Arcaeformis, Lea. 



Arrosus, Ziegl. 

 ^ Asperimus, Lea. 

 — Ater, Nilsson.^ ^^«(■-^il:l2^ 



Ätratus, Swains. ^' '/•'.' 



Atrovirens, Schmidt. 



Anratus, Swains. 

 — Batavns, Lmrk. 



Bonellii, Ferr. 



Brevidens, Lea. 



Burroughianus, do. 



■ 7 



V' 



^ 



Capsaeformis, Lea. 

 ,--Carinthiacus, Ziegl. 

 — Cariosus, Say.- A--<r 

 Caraiolicus, Ziegl. 

 Castaneus, Lea. 

 '— Circulus, do. 



Clavns, f^mrk, 

 — -€occinens, Lea. 

 . — Complanatus, do. \ ■ ■ . 

 Compressus, do. 

 Congaraens, do. 

 Conradicus, do. 

 Cornutus, Barnes.- 

 Corosus, Partsch. 

 ^^rassidens, Lmrk. 

 ^„^rassus, Say. - /ai-f!'''i -■• 

 Cnmingianus, Dunker. 

 „-Cylindricus, Say. 

 — Declivis, do. 

 -'Decurvatus, Rossm. 

 Delphinulatus, Morelet 

 Delpliinus, Grüner. 

 Dolabraeforuiis, Lea. 

 Donaciformis, do. 

 Dromas, do. 

 — Ebenus, do. 



Elegans, do.- A^-»"^*^ 

 EUipsis, do. 

 Ellipticus, Spix. 

 Elongatulus,Mlilf.&Pfeifj 

 Fabalis, Lea. 

 Fislierianus, do. 

 Flavidens, Benson. 

 Foliatus, Hildr. 

 Gangrenosus, Ziegl 

 Gibbosus, Barnes. 

 Glans, Lea. 

 Glausinus, Porro. 

 Gracilis, Barnes.- »i-ft 

 — Grayanus, Lea. 1 



Heterodon, do. i 



Hopetonensis, do. 



Iris, do. 



.^Irroratus, do.S'^A^ft^Kfi 

 Javanus, do. ■ 

 Kirtlandianus> do. 

 Laevissimus, do. 

 Lacrysomus, do. 

 Lancenlatus, do. 

 Le Contianus, do. 

 __-Lens, do. 



I^imniger, Ziegl. 

 Limosus, Nielsson. 

 ittoralis, Lmi"k. 

 ongirostris, Ziegl. 

 Lugubris, Lea. 

 Luteolus, Lmrk. 

 Manca, Ferr. 

 Marchisonianus, Lea. 

 Margaritifer, Retzius. 

 Marginalis, l^mrk. 

 Metanever, Lea. 

 Michaudii, Des Moni. 



*^'-M 



Modioliformis, Lea. 

 Multiradiatus, do. 

 Multistriatus, do. 

 Xasutus, Say. 

 Niloticus, Caillaud. 

 Nodosus, Miililfeld. 

 Nodnlosns, T.mrk. 

 Obesus, Lea. 

 Obliquus, Lmrk. 

 Oceidens, Len. 

 — Ocbraceus, Say. 

 Olivarius, Lea. 

 Orbiculatus, Hildr. 

 Orientalis, Ferr. 

 Ovatus, Say. 

 Pallens, Parr. 

 — Panacoensis, v. d. Busch. 

 Paranensis, Lea. 

 Parvus, Barnes. 

 Patulus, Lea. 

 Pectorosus, Conrad. 

 Perplexus, Lea. 

 Phaseolus, Hildr. 

 — ^Pictorum, f^nirk. 

 Planilatei-is, Conr. 

 Platyrhynchus , Rossm. 

 . Plicatus, Say. 



Pliciferus, Lea. 

 — Pustulosus, do. 

 ,— Pyramidatus, do. 

 — Radiatus, Lmrk. 

 Ravenelianvis, l^ea. 



Rectus, Lmrk. 



._ Jieniformis, Schmidt. 



Reqxiienii, Michd. . 

 - Retusus, L««k. «<t = ^^'^' 

 Rhuacoicus, d'Orbig. 

 Riparius, Pfeiffer. 

 Rossmessleri, Stentz. 

 — Rubiginosus, Lea. 



Schaumburgens., Dnnk. 

 Securis, Lea. 

 Semi-granos., v. d. Busch. 

 .^S^hepardianus, Lea, 



Sowerbianus, do. 

 .,_ Spinos'.is, do. 

 Splendidus, do. 

 Subtetragonus, Mich. 

 Sulcatvis, Lea. 

 Tampicoensis, do. 

 Tavoyensis, Gould. 

 Tenuissimus, Lea. 

 Triaiigularis, Barnes. 

 Trigonus, Lea. 



nberculatus, Barnes. 

 -Tumidus, Retzius. 

 ndulatus, Barnes. 

 Varicosus, Lea. 

 Ventricosus, Barnes. 

 Ventrosus, Ziegler. 

 ^'errucosus, Barnes. 

 Zelaudicus, Gray. 

 Zigzag, Lea. 



2 



