292 INDEX. 
Page. Page. 
Macropon—Continued. Myarina—Continued. 
truncatus peoncastctoo? 243 ampla ...-------s00-csenescnneee snes cencessnnsee 238 
MARTINIA, subgenus...-.- maeneoherocoaear caccecotes 139 ApacheSi ....-...------+----eeece scene ASAcCa se 225, 237 
MEGAMBONIA .--...----------0 5 Staaten EO ueee 173 aviculoides .. 225 
Occidualis 2. -cesecerc- qoecwe cuewnsnaansmesaan 173 congeneris......-..-----+----------0-ee+ e2- === == 237 
subcordiformis 173 Nemesis «22200. 5- 6-22 cn pen ncermennsensce= >= -=== 237 
MENOCEPHALUS Sedgwicki 51, 54 INGSSUB ic oe sociatnre sa iesatataale om aie ommeim nletera infers 238 
MERISTELLA ....-- 2-2 --- eee eee eee e ee eee ere ee nr eres 148 Permiana “ 295 
Wligea..=--=2<<c~-sena= Sees bo Oo 148 St. Lndoviea. . <2 205-22 ccncecwececene==s0~ === 237 
nasuta -.- Popeocececmaso EAE) subquadrata ......-...---------------+---------- 237, 238 
tumid@s scence sccstecetenss seswnc===ensiasennenmes 149 PSwallovi.....-00..---0-----csesecnee Scowes lees 225 
(Whitfieldia) nasuta ......-.----.---+-+++++-++-- 148 SDP fccesteeacens aah 295 
METOPTOMA. -...--.----2-eeeeee eee ee eee- ~- 83,195,260 | MYTILARCA ....-..------------ 2202 eee ene e ee eee eee 168 
f analoga. ...---------ee0--2- seen ee eeeene eet 84 Chemungensis --.--...-------------------+------ 168 
@Devonica ...-..-------e--- ee eneee ec eee een ceee== 195 ODT yee Spenco con see mare acconinecne 168 
Phillipsi .-....-------- eee-- -2eeee seers eeene cee §3, $4 oviformis ---. 169 
peroccidens BGO | Spikes - 2) ween een ese c see senkeece me ewee === =m aewe 276 
perovalis 84 (Plethomytilus) oviformis...-...--------------- 168, 169 
TrentonensiS ...--------- se-seeceee nents 84 | Mytirus Chemungensis..-.-.----------------------- 168 
MICRODON)--0=2- <ases s--2->-<~===2e2s-moeneew nen 180,250 | Narvicorsis (like N. equistriata).......-----.--..--- 278 
complanatus .....--.--------+seee+seeeeetttree 180 EW peep eeeecoot Sere ro cerca G-Osiona ao seo 278 
(Cypricardella) bellistriatus --- 250 | Nautivus (like N. digonis) ..-.-.-.---.------------- 281 
(Cypricardella) connatus.---------------+-+++--- 250 | NUCLEOSPIRA ........---.----------------------+---- 147 
(Cypricardella) gregarius- ---.----------- ++---- 250 concinna. - 147 
(Cypricardella) macrostriatus.-+..------------- USO, 250 | NUCULA ..-..-.----- +--+ ++ +--+ eee erent eee eee e ee 172, 241 
MODIOLA .------ }-=-----=" Beeee sag soo ceo see Poomaguen 239 ATAtA, <c<- 220 seers cone cedean ewer ese s naan 295 
?Nevadensis peee eens eee 51) palateintar soon ee ee Se ees 241 
MODIOLOPSIS.----------- +2220 2 -eeee teeter i7 Pnnlaris eee conse eae 241 
mytiloides ...---.--.--- 17 WiGwatars 2 ook es ee ee ee Sete eee 242 
occidens --. 7 levatiforme 241 
Pogonipensis...-...-----------02e0++seret sett 7s Niotigata- essere. tee aces rene eet ec teemmneeeets 172 
Bp Menem eta non n1-lase eno ono one e ncer an 270 Rescuensis 172 
MOopIOMORPHA......--.----------- serene sree F 169, 239 VATIGOBS Soe rai ae Sen ee eee ae eee 241 
170 Fin Heese nes ees ne mee eece rs eseecbaacteeaas 172 
169 | NucuuirEs triangulus 277 
BSO)| NYASSA, cose seen nea Sea 
240 PATVA ...---- 2.02 22-2 eee eee ee eee eee ee ee ese eee 
240 PERiS Ge fencon ee eee Rae ne eae eee aaees 
176. |MQROUENEA soe. secs cee. - ote e ee eel tence ae 
170 ? ambigna 
Avi ChromatiGa ceoscsoeee eee ee ane ee cee aa 68 
¢ Pintéensis......-.---2-----2--eeeee eee ee 240 desiderata’s..0. cenesc. cessor san aomn-emacneatain 68 
quadrula. ...--. .---------s2eeee ener ee eee seeee 171 desquamata...-..------ ----+++-+eeeeee seers sees 68 
MMOoNOPTERIA Marian.....----------+---- e++-eeeree 7 225 discoidea 
MOoNTICULOPORA sp.? 
MURCHISONIA . - 
OGYGIA! 2 cose coe oon cca cee a ale ere eel nee 36 
MYALINA 237 ? problematica 63 
angulata ......ecee- +--+ eeseeceen nee ne ese esees 287 @ spinosa ......----------eeeeee eee e ee eee teens 63 
