HELIX §.21. 107 



dato-lunaris; perist. simplex, rectum, acutum. — Diam. maj. 

 5, miii. 4^3, alt. 2 mill. (Mus. Cuming.) 



Helix perdepressa Adams Gontril). to Gonchol. N. 3. p. 36. 

 Habilat in insula Jamaica. 



478. H. rotula Gould. •{• 



T. parva, discoidea, pellucida, nitida, electrina, //. siip- 

 pressae similis, umljilico infundibuliformi profunde perforata; 

 anfr. GYo vix convexi, striis distantibus superne impressi; su- 

 tura marginata; apertura semilunaris; labrum simplex, haud 

 incrassatum. — Diam. 7^ poll. (G.) 



Hetix rotiila Gould in Proc. Bost. Soc. 1848. p. 38. 

 Habitat in Tennessee. 



Obs. I. «Statura et colore Hel. indentatae , simihterque supernc 

 sU'iuta; anfr. numerosi et arcte convoluti ut in H. suppressa, sed um- 

 hilicus latior est (ut in Hel. lasmodonte) et plica aperturae nulla adest.» 



Ohs. 2. Nomen, si hona species est, mutandum oh H. rotulam Lowe. 



479. limatula Ward. •}• Mon. I. p. 113. 



480. circumlineata Kiist. (Goil. 207. — Chemn. ed. 



nov. I. p. 184. — Hyalina Alh. p. 67.) - - - 114. 



481. cyclostomoides Pfr. (Goll. 208. — Chemn. ed. 



nov. II. p. 113. — Hyalina Alh. p. 67.) _ _ _ ||4. 



482. minuta Villa. ^ - - - M4 



483. H. eta Pfr. 



T. umbiiicata, depressa, subtiliter costulato-striata, sericea, 

 cerea; spira planiuscula; sutura impressa; anfr. 4 vix con- 

 vexiusculi, ultimus latior, non descendens, depressus; umbili- 

 cus latiusculus, perspectivus; aperlura parum obliqua, lunato- 

 subcircularis; perist. sirnplex, rectum, marginibus conniventi- 

 bus. — Diam. maj. 3, min. 2%, alt. 1 V3 mill. (Goll. Nr. 209.) 



Helix ela Pfr. in Proc. Zool. Soc. 1851. Dec. 

 Habitat in Nova Seelandia (Strange). 



484. H. helicycloides Orbigny. 



T. latissime umbilicata, depressa, discoidea, solidula, lae- 

 vigata, subdiaphana, griseo-flavicans, parum nitida; spira 

 ])]ana, medio subimmersa; anfr. 10 angustissimi, vix convexi- 

 usculi, ultimus rotundatus, non descendens, omnes in umbilico 

 latiores quam supeme; apertura obliqua, obauriformis ; perist. 

 simplex, obtusum, inarginibus remotis, supero depresso, an- 



