456 
Duvalii Mich. in Journ. Conch. X. 
p. 65. t. 3. f. 44 —46. 
Evansi Meek et Hayden Proc. 
Philad. 4860. p. 475. 
exslincta Rambur in Journ. Conch. 
AN. p. 172,0. 8:5. 558. 
Geryvillensis Bourg. Paléont, Algér. 
1862. 
Gualinaei Mich. Hauterive 4855. 
gyrioria Bourg. Paléont. Algér. 1862. 
Jobaeana Crosse in Journ. Conch. 1X. 
p. 356. X, ipe 453.4. 8.fi. 31. & 
Ac. 
H. Jobae Bourg. Paléont. Algér. 
1862. 
Jourdani Mich. in Journ. Conch. X. 
ps3. 45:342 43! 
Koleensis Bourg. Paléont. Algér. 1862. 
?labyrinthicula Mich. 
Lucani Tourn. in Bull. soc. 
France 2e sér. XXIII. 4866. 
Munieri Desh. An. S. wert. bass. Par. 
Livr. 35. 36. 
Nayliesii Mich. Hauterive 1855. 
IX. 
géol. 
IIELIX. — BOYSIA. — PLECTOSTOMA. 
obruta Morel. et Drouét Moll. terr: 
Acor. 1860. 
psammoecia Bourg. Paléont. Algér. 
1862. 
rechodia Bourg. ibid. 
ruderoides Mich, in Journ. Conch. X. 
p. 64. t. 3. f. 9—44. 
Semperiana Crosse in Journ. Conch. 
IX, p.357..X; *& daB c HUE AE 
— Zonites Semperianus Bourg. Pa- 
léont. Algér. 1862. 
spatiosa Meek et Hayden in Proc. 
Ac. Philad. 4861. p. 446. 
subsenilis Crosse im Journ. Conch. X. 
p. 85. 4162. t. 7. f. 429—146. 
Vanvincquiae Crosse in Journ. Conch. 
IX, p. 357.. X. p.458. 6 E 
41. — H. Vanvincquiana Bourg. 
Paléont. Algér. 1862. 
veterna Meek et Hayden in Proc. Ac. 
Philad. 1861. p. 447. 
Victoris Mich. in Journ. Conch. X. 
p. 63: 3:4: :453E 
Boysia Pfr. 1849. 
Pfr. Mon. Helic. IV. p. 325. —  Hypostoma Albers Helic. 
4850. p. 130: genus Heliceorum. —  Zypotrema (sectio 21 Pu- 
pae) Albers Melic. ed. Martens p. 304. (Nomen mutatum ob 
Hypostoma genus Piscium.) 
Species unica : 
1. Bensoni Pfr. (Coll. Nr. 1.) Anostoma DBoysii Bens. — Hypostoma 
Boysii Alb. — Pupa Boysii (Hypotrema) A?. 305. — India orien- 
talis. (L. 2.) 
X. Pleetostoma H. Adams. 
« Testa conica, umbilicata; anfractus ultimus solutus, pro- 
iractus, sursum flexus, inde retrorsum extensus; apertura sim- 
plex; peristoma subverticale, expansum.» 
Plectostoma (novum genus Helicidarum) H. Adams in Ann. and 
Mag. n. h. 3d. ser. V. Mart. 1860. 
«Differt a Boysia forma helicoidea et umbilico aperto, ab Hypselo- 
stomate apertura edentula, ab "utroque genere anfractu ultimo soluto, 
constricto et retrorsum prolongato.» 
