722 
Spheiudai, Scopoli, II, 4fj5, / 197 , 5oo, 
0*23, (jaO, 629 , 644, 645, 
651. 
— æqiiatoriale, II, 6 I 19 . 
— Baliiease, II, 65o. 
— caliciilalum, II, 652. 
— corneum, II, 646, 647 . 
— Cubense, II, 65 0 , 654. 
— Forbesi, II, 649 . 
— lacustre, II, 646, 65 0 . 
— maculatum, II, 653. 
— meridionale, II, 65o, 654, 675 . 
— modioliforme, II, 65o. 
— parvulum, II, 654. 
— Porloj'iceuse, II, 65o, 654. 
— rivale. 11, 646. 
— rivicola, II, 645, 646, 647 . 
— securis, II, 647 , 648. 
— solidulum, II, 652. 
— solidum, II, 65o. 
— subtransversum, T. Prime, 
II, 649, 652, 675 . 
— transversum, II, 646. 
— triangulare, Say, II, 651. 
— viridans, II, 65o, 654. 
— Yucatanense, Crosse et Fischer, 
II, 65o, 653, 678 . 
SPHENONAIAS, Crosse et Fischer, 
II, 507, 616. 
SPIRAXIS, C. B. Adams, I, 28 , 585, 
604, 607, 699 . 
— acus, Sbullleworlli, I, 614. 
— ambigua, I, 189 . 
— auriculacea, I, 55. 
— Barelayi, I, 20 . 
— Berendti, Pfeiffer, I, 611 , 
613. 
— biconica, I, 82 . 
— Blandi, Crosse et Fischer, I, 607 , 
616. 
— Boucardi, I, 43. 
— brevis, I, 6o4. 
— catenata, I, 63. 
— Cobanensis, I, 52. 
— coniforrais, I, 43. 
— costulosa, I, 60 4. 
— costulosus, I, 61 5. 
— cyliudracea, I, 3i. 
— dubia, I, 65. 
— enptyda, 1 , 612 . 
INDEX ALPHABÉTIQUE. 
SPIRAXIS euptyctus, Pfeiffer, 1, 
611 , 612, 61 3, 61 4. 
— flavescens, I, 89 . 
— Guatemalensis, Crosse et Fi- 
scher, I, 607 , 618, 624 ; II, 
476 . 
— irrigua, I, 87 . 
— Laltrei, I, 33. 
— ligulata, I, 68 . 
— linearis, Pfeiffer, I, 616. 
— lurida, I, 48. 
— lymnæiformis , I, 38. 
— Martensi, Pfeiffer, I, 619. 
— jMeridana, I, 82 . 
— Mexicana, I, 617 . 
- Mexicanus, Pfeiffer, I, 617. 
— mitræformis, I, 62 . 
— Mobriana, I, 64. 
— Nicoleti, I, 2 . 3 . 
— nigricans, I, 60 . 
— ■ oblonga, I, 87 . 
— parvula, I, 67 , 
— Pfeifferi, I, 28 . 
— jdiysodes, I, 54. 
— Salleana, I, 87 , 608 . 
— scalariopsis, Morelet, I, 609. 
— Shuttleworlbi, I, 91 . 
— streptostyla , I, 27 . 
— sulciferus, Morelet, 1, 607 , 
610, 612 , 6i3. 
— tenuis, Pfeiffer, I, 614, 
— turgidula, I, 58. 
— veutricosula, I, 3i. 
Stalioa, II, 274 . 
Stesogviu, I, 58 1 , 585. 
— Berendti, I, 635. 
-- Bocourtiana, I, 602 . 
— Caracasensis , I, 599 . 
— Caraccasensis, I, 899 . 
— Colimeusis, I, 6o3. 
— Mai'tensi, I, 620 . 
— octona, I, 64o. 
— Bangiana, I, 689 . 
— subula, I, 600 . 
— trochlea, I, 642, 
STENOGYRIDÆ, I, 581 , 629 , 699 . 
Stevomelania, II, 3o8, 809 , 3 10 , 
3ii. 
Stexopüs, I, i54. 
Stenotiivisa, II, 2 54. 
Stephanoda coactiliata, I, 234. 
Stimpsoxia, II, 2 58. 
Stoastoma, II, 878 , 382 , 387 . 
STREBELIA, Crosse et Fischer, I, 
11, 644, 699 ; II, 3i, 687 , 
681 , 682 . 
— Berendti, Pfeiffer. I, 12; II, 
657 , 661 , 678 . 
Stuepiioiiasis, II, 684. 
Stuepomatid.e, II, 807 , 3io, 684. 
STREPTOSTYLA, Slmttlewortb 
(emend.), I, 14, 6o5, 699 ; II, 
67 . 3 , 674 , 682 . 
— auriculacea, Pfeiffer, I, 55, 67 . 
— biconica, Pfeiffer, I, i5, 28 , 
32, 55, 57 . 
— Binneyana, Crosse et Fischer, 
I, 29. 
— Blandiana, Crosse et Fischer, I, 
28, 44. 
— Bocourti, Crosse et Fischer, I, 
47, 49 . 
— Botteriana , Crosse et Fischer, 1 , 
28 , 25 , 26 , 33 , 66 . 
— Boucardi, Pfeiffer, I, 48, 56, 
54; II, 670 . 
— Boyeriana, Crosse et Fischer, I, 
46. 
— bullacea, Pfeiffer, I, 48, 56. 
— catenata, Pfeiffer, I. 63, 87 . 
— cingulata. Crosse et Fischer, I, 
40. 
— Cobanensis, IVistram, 1, 52, 54. 
— coniformis, Shuttleworth , I, 3i, 
43, 47 ; II, 658. 
— cornea. Crosse et Fischer, I, 51. 
— cylindracea, Pfeiffer, I, 30; II, 
670 . 
— Delattrei, Pfeiffer (emend.), I, 
33, 38. 
— delibuta, Morelet, I, 44. 
— dubia, Pfeiffer, I, 28 , 65. 
