20 MARINE SHELLS. 
Nass. coopera ie toes. hoe FB. is 6 2. el California 
Nasca fossa ta tetas) fee): Sons Gid..... :.. ae California 
Waste taseulpia. 62290: Bess: CD? ss vsi ssa . California 
Nagsa menudiea. 2..0.4. 2855 A Glas O06). rr California 
Nagsa;obseleta.. s. 052 oe... 502. Say.... ++... 008 Miassecimeeme 
Nassaaperpipeuis:.... 2 > seed Hads.... . 2... 2 
Nassevtemla ote ee Ee California 
Nassa trivittata Say. | 
<ispeer meee uep ant as maa ee Shee Yon: S. C. and Mass. 
= Trittia trivittata......... Say. § C 
Wessaivilex:tco0 Gus ateca soe SY. « > 2... Florida 
ps eo. Yala sete Salts Beet SQ). 2-2 0 Florida 
NATICA. 
Natica campeachiensis......... Rechiz.-.. .. (252 .. Texas 
Waties Onplicaiae ac coer. Say... 2s) eee .. Florida 
NaliCa (mst hi. beers es eee Say.) eee South Carolina ~ 
NAVEA. 
DNavea newecomibies oso. ois... LTY ORs ws 5 Se California 
* NERITA. 
Neritatesseliatar:.. 2. oc. tse. Gmél . 3. eee Florida 
: NEVERITA. 
Neverita dupliesia..ca-. 2-2. SQ)... 22S ee South Carolina 
Neverita’ recluziana......: gt tee Petit... 2 ae California 
NITIDELLA. 
Nitidella gowldis >. peeves cae... Cor... ... 3 California 
NUCULA. 
Nulla proximay 2 soot et ee SOY 2. Rhode Island 
OBELISCUS. 
Obeliscus crenulatus........... Holmes..........South Carolina 
Obeliscus variegatus.... ....... Core. «eo eee California 
