IIELIX §. 69. 70. 379 



culans, cxtus tenue strangulata; perist. reflexum, tenuissimum; 

 umbilicus infuudibuliformis, profundus. — Diam. 7 — 8, alt. 4 — 

 4'/2mill. (G.) 



Helix cydostomata Le Guill. in Revue zool. 18 42. p. 141. 

 Ilabitat in insula Warrior ( « detroit de Torres » : Guill. ). 



Obs. An forte eaclem, quam Nr. 947 nomine H. Tuckeri descripsi? 



§. 70. 

 0S6. H. bifurcata Deshayes. 



T. umbilicata, depressa, orbicularis, leviter striata, fulva, 

 subtus pallida, vel medio tantum pallide cingulata; anfr. 5 planu- 

 lati, ultimus obsolete carinatus, antice subito deflexus; apertura 

 depressa, transverse pyriformis, lamina elongata, compressa, 

 erecta, intrante coarctata; perist. albidum, reflexum, marginibus 

 callo prominente junctis , basali dentibus 2 , altero depresse trian- 

 gulari, altero bifurcato, instructo. — Diam. maj. 37, min. 33, alt. 

 15 mill. (Mus. Cuming. spec. max. et CoU. Nr. 604.) 

 Ilelix bifurcata Desh. in Guer. mag. t. 1 1 1. f. 2. 

 _ _ Chemn- ed- H. Helix N. 664. t. 1 05. f. 1 — 4. 



— plicata Fer. hist. t. .'54 B. f. 1. 



~ — Desh. in Enc. meth. H. p. 231. N. 63. (excl. synon.) 



Ilabitat in Guyana. 



Obs. 1. Variat magniludine. Alia specimina mullo minora vidi. Carina 

 magis minusve acuta antice evanescit. Rarissime umbilicus fere obtectus est. 



Obs. 2. Conf. H. labyrinthus Nr. 1035, H. auriculina Nr. 1039, etc. — 

 Varietas H. Bainbridgei (Nr. 818.) umbilico aperto eliam hoc loco quaeri potest. 



9S7. H. planulata Lamarck. 



T. umbilicata, orbiculato-convexa , solida, laeviuscula, alba, 

 fusco-marmorata et interrupte fasciata; spirabrevis, obtusa; anfr. 

 5 planiusculi, ultimus teres, interdum subangulatus, antice subito 

 deflexus; umbilicus mediocris, pervius; apertura horizontalis, 

 integra, elliptica; perist. incrassatum, marginibus junctis , supero 

 expanso, basali reflexo, unidentato. — Diam. maj. 31 , min. 24, 

 alt. 14 — 15 miU. (CoU. Nr. 605.) 



Helix planulata Lam. 27. p. 73. ed. Dh. p. 40. 



— — (Hehcella) Fer. pr. 187 bis. Hlst. t. 73 A. f. 3. 



— — Chemn. ed. II. Helix N. 77. t. 14. f. 9. 10. 



— auriculata Swains. Zool. 111. t. 9. 



— — Woocl suppl. t. 7. f. 4. 



— papiliotiacea Val. Humb. voy. Zool. II. p. 241. t. 56. f. 6. 



— collapsa (Helicella) Fer. pr. 187? 

 Planorbis collapsus Perry Conch. t. 51. f. 5? 

 Obba planulata Beck ind. p. 30. 



