20 



umo. 



442 TTnio eloiigatus 

 44"2rt sinuosus 



443 crassideiis 



444 Peruvianus 



445 jiurjmratus 



446 ovatus (a) var. radils loiigitudlnalibus 



447 dclodon ? 



448 Pictdrum 



449 coriu£:atus, two varieties 



450 hit col us 



451 marginalis 



452 Oralis, JNIont. 



453 



454 



455 



456 



457 



458 



459 



460 



HYRIA. 



461 Ilyria avicularis 



462 coiTugata 



463 clongata, Swamson 



Aj\ODO.N. 



464 Anodon sulcatiis 



465 anatiinis 



466 intcrmedius 



407 trapczialis, a pair, one valve partly un- 



coated and polished 



468 ■ rubens, oue valve 



469 cxoticus, different stages of growth 



