12 



471. Amnicola granum, Say. 



472. Amnicola lapidaria, Saij. 



473. Amnicola limosa, Say. 



474. Amnicola longinqua, Gld. W. 



475. Amnicola lustrica, Say. 

 47(5. Amnicola Nickliniana, Lea. 



477. Amnicola obtusa, Lea. 



478. Amnicola orbiculata, Lea. 



479. Amnicola pallida, Hald. 



480. Amnicola parva, Lea. 



481. Amnicola porata, Say. 



482. Amnicola protea, GUI. "W. 



483. Amnicola tenuipes, Couper. 



484. Amnicola Sayana, Anth. 



PIjI.M«>:V05IRA]VCHIATA. 

 LiiiuiiacidcC. 



485. Limnaea ampla, Mijhels. 



486. Limnaea apicina, Lea. W. 



487. Limnaea appressa, Say. 



488. Limnaea attenuata, Say. M. 



489. Limnaea bulimoides, Lea. "W. 



490. Limnaea caperata, Say. 



491. Limnaea casta, Lea. 



492. Limnaea catascopium. Say. 



W. E. 



493. Limnaea coarctata, Lea. 



494. Limnaea columella, Say. 



495. Limnaea curta, Lea. 



496. Limnaea decollata, Mighels. 



497. Limnaea desidiosa, Say. 



498. Limnaea exigua. Lea. W. E. 



499. Limnaea expansa, Hald. 



500. Limnaea ferruginea, Hald. 



W. 



501. Limnaea fusiformis, Xea. 



502. Limnaea galbana, Say. 



503. Limnaea gracilis, ./aj/. 



504. Limnaea grcenlandica. Beck. G. 



505. Limnaea Griffithiana, Lea. 



506. Limnaea Haydeni, Lea. 



507. Limnaea HolboUii, Beck. G. 



508. Limnaea humilis, Say. 



509. Limnaea jugularis, Say. W. E. 



510. Limnaea Kirtlandiana, Lea. 



511. Limnaea lanceata, Gld. 



512. Limnaea lepida, GW. W. 



513. Limnaea megasoma. Say. 



514. Limnaea obrussa. Say. 



515. Limnaea pallida. Ad. W. E. 



516. Limnaea palustris, Lin. "W. E. 



517. Limnaea parva, Lea. 



518. Limnaea Pingelii, Beck. G. 

 619. Limnaea planulata. Lea. 



520. Limnaea platyostoma, Hald. 



521. Limnaea plica. Lea. 



522. Limnaea proxinia, Lea. "W. 



523. Limnaea reflexa, Say. 



524. Limnaea rugosa, J 'a/. M. 



525. Limnaea rustica, Lea. 



526. Limnaea solida. Lea. W. 



527. Limnaea strigosa, Lea. 



528. Limnaea subulata, Dunk. M. 



529. Limnaea Vahlii, Beck. G. 



530. Limnaea vitrea, Hald. 



531. Pompiiolyx effusa. Lea. "W. 



532. Physa ancillaria; Say. 



533. Physa aurantia, Carp. W. 



534. Physa bullata, Gld. W. 



535. Physa Charpentieri, Kiist. 



536. Physa concolor, //o/J. W. 



537. Physa distorta, Hald. 



538. Physa data, Gld. "W. 



539. Physa fragilis, Mighels. 



540. Physa globosa, Hald. 



541. Physa gyrina. Say. 



542. Physa heterostropha, Say. 



W. E 



543. Physa Hildrethiana, Lea. 



544. Physa humerosa, 6r'W. W. 



545. Physa hypnorum, Lin. "W. E 



546. Physa inflata. Lea. 



547. Physa Integra, Hald. 



548. Physa mexicana, Phil. M. 



549. Physa microstoma, Hald. 



550. Physa nitens, Phil. M. 



551. Physa osculans, Hald. M. 



552. Physa Philippii, KUster. 



553. Physa pomilia, Conr. 



554. Physa semiplicata, KUst. ? 



555. Physa scalaris. Jay. 



556. Physa solida, P/a7. 



557. Physa triticea. Lea. 



558. Physa Troostiana, Lea. 



559. Physa vinosa, Gld. 



560. Physa virgata, Gld. "W. 



561. Physa virginea, Gld. "W. 



562. Planorbis albus, Mull. 



563. Planorbis ammon, GW. "W. 



564. Planorbis antrorsus, Conr. 



565. Planorbis arcticus. Beck. G. 



566. Planorbis armigerus. Say. 



567. Planorbis bellus. Lea. 



568. Planorbis bicarinatus, Say. 



569. Planorbis Buchanensis, Lea. 



570. Planorbis campanulatus, iSay. 



571. Planorbis corpulentus. Say. 



W. E 

 Planorbis deflectus. Say. 

 Planorbis dilatatus, Gld. 

 Planorbis exacutus, Say. 



572 

 573 

 574 

 (/) 



