HELIX §. 69. 70. 379 



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

 umbilicus infundibuliformis, profundus. - — Diam. 7 — 8, alt. 4 — 

 4 '/2 mill. (G.) . 



Helix cyclostomata Le Guill. in Revue zool. 1842. p. 141. 

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



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



§. 70. 



9SG. H. bifurcata Deshayes. 



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

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

 iati, ultimus obsolete carinatus, antice subito deflexus; apertura 

 depressa, transverse pyriformis, lamina elongata, compressa, 

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

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

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

 15 mill. (Mus. Cuming. spec. niax. et Coll. Nr. 604.) 

 " Helix bifurcata Desh. in Guer. mag. t. 1 1 1. f. 2. 



— — Che7nn. ed. II. Helix N. 664. t. 1 05. f. 1—4. 



— plicata Fer. hist. t. 54 B. f. 1. 



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

 Habitat in Guyana. 



Obs. 1, Variat magnitudine. Alia specimina multo minora vidi. Garina 

 magis minusve acuta antico evanespit. Rarissime umbilicus fere oblectus esl. 



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

 Varietas H. Bainbridgoi (Nr. 818.) umbilico aperto eliam boc loco quaeri potest. 



9S7. H. planulata Lamarck. \ . . y . 



T. umbilicata, orbiculato-convexa , solida, laeviuscula,' alHa," 

 fusco-marmoi^Ma et interrupte fasciata; spirabrevis, obtusa; anfr. 

 5 planiusculi, ultimus teres, interdum subangulatus, antice subito 

 deflexus; umbilicus mediocris, pervius; apertura liorizontalis, 

 integra, efliptica; perist, incrassatum, marginibus junctis , supero 

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

 alt. 14 — 15 miU. (Coll. Nr. 605.) 



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



— — (HeHcella) Fer. pr. 187 bis. Hist. t. 73 A. f. 3. 



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



— auriciilata Sivains. Zool. 111. t. 9. 



— — Wood suppl. t. 7. f. 4. 



• — papilionacea 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. 



