HELIX §. 69. 70. 
379 
cularis, extus tenue strangulata ; perist. reflexum, tenuissimum; 
umbilicus infundibuliformis, profundus. — Diam. 7 — 8, ait. 4 — 
4 V 2 mill. (G.) 
Helix cyclostomata Le GidlL in Revue zool. 1 842. p. I 4 L 
Habitat in insula Warrior («detroit de Torrds»: GuilL), 
Obs. An forte eadem, quam Nr. 947 nomine H. Tuckeri descripsi? 
§• 70. 
'986. 
H. bifurcata Dcshayes. 
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, ait. 
13 mill. (Mus. Cuming. spec. max. et Coll. Nr, 604.) 
Helix bifurcata Desh. in Gudr. mag. t. 1 1 1. f. 2. 
— — Chemn. 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. (exci, synon.) 
Habitat in Guyana. 
Obs. 1. Variat magniludine. Alia specimina multo minora vidi. Carina 
magis minusve acula antice 'evanescit. Rarissime umbilicus fere obtectus est. 
Obs. 2. Gonf. H. labyrinthus Nr. 1035, H. auriculina Nr. 1039, etc. — 
Varietas H. Bainbridgei (Nr. 818.) umbilico aperto etiam hoc loco quaeri potest. 
H. planulata Lamarcls. 
T. umbilicata, orbiculalo-convexa, solida, laeviuscula, alba, 
fusco -marmorata et interrupte fasciata; spira brevis, obtusa; anfr. 
3 planiusculi, ultimus teres, interdum subaugulatus, antice subito 
deflexus; umbilicus mediocris, pervius; apertura horizontalis, 
integra, elliptica; perist. incrassatum, marginibus junctis, supero 
expanso, basali reflexo, unidentato. — Diam. maj. 31 , min. 24, 
ait. 14 — 13 mill. (Coli. IsY. 605.) 
Helix planulata Lam. 27. p. 73. ed. Dh. p. 40. 
— — (Ilelicella) Fer. pr. 187 bis. Hist. t. 73 A. f. 3. 
— ~ Chemn. ed. H. IlelLx N. 77. t. 1 4. f. 9. 1 0. 
~ auricidata Swains. Zool. 111. t. 9. 
— — Wood suppi, t. 7. f. 4. 
— papilionacea Val. Humb, voy. Zool. II. p. 241. l. 36. f. 6. 
— collapsa (Helicella) F4r. pi*. 187 ? 
Planorbis collapsus Perry Conch. t. 51. f. 5? 
Obba planulata Beck ind. p. 30. 
