RISSOIDA. 55 
Sub-Genus TRYONTIA, Stimpson. 
Smithsonian Misc. Coll. VII, 1865, type T. elathrata, Stimpson. 
50. Hydrobia (Tryonia) protea. 
Amnicola protea, Gould, Proc. Boston Soc. V, 1855, Colorado Desert, 
18 Desert, E. of California; coll. Prof. E. C. Stearns. 
Sub-Genus PSEUDAMNICOLA, Paulucci. 
Mater. Malac. Ital. 1878, type Paludina similis, Drap. [ for Amnicola, 
Authors, not of Gould and Hald.]. 
51. Hydrobia (Pseudamnicola) similis. 
Cyclostoma simile, Draparnaud, Hist. Moll. Fr. 1805 [sine Hab.]; fide 
Jeffreys, Hydr. anatina, Auct. [not of Potret or Drap.]. 
2 Bonfarick [Algiers]; coll. P. Joly, Esq. 
8 England; ex c. G. Nevill, Esq. 
52. Hydrobia (Pseudamnicola) dupotetiana. 
Paludina Dupotetiana, Forbes, Aun, Mag. 1838, Bougie. 
30 Maison Carrée [Algiers]; coll. P. Joly, Esq. 
7 Biskra; coll. P. Joly, Esq. [83, 24]. 
6 Boghar; coll. P. Joly, Esq. [as “ Hy. lutea’’]. 
53. Hydrobia (Pseudamnicola) subproducta. 
Hydrobia subproducta, Paladithe, Rev. Mag. Zool. 1866,.Catalonia and 
Pyrénées Orientales, “errata,” p. 40, for Hy. spirata, Paladithe, 1. c. [not 
of Requien). 
10 Cartagena [Spain]; coll. G. Nevill, Esq. 
54. Hydrobia (Pseudamnicola) macrostoma. 
Paludina macrostoma, Kiister, Conch.-Cab. IT, 1853, Athens. 
2 Chalcis [Greece]; ex “ Linnza.” 
55. Hydrobia (Pseudamnicola) seminula. 
Amnicola ‘seminula, Charpentier ms., von Frauenfeld, Ver, zool.-bot. 
Ges. Wien, 1868, p. 1027, Arcadia—long. 1:5, diam. 13 mil, 
8 Eubeea; ex “ Linnea” and P. Bouvier, Esq. 
56. Hydrobia (Pseudamnicola) negropontina. 
Amnicola negropontina, Clessin, Malak. Blat. XXV, 1878, Eubea, 
4 Eubeea ; ex “ Linnea,” 
