HELIX §. 21. 107 



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

 5, rain. 4^3) ^'t. 2 mill. (Mus. Cuming.) 



Helix perdepressa Adams Gontrib, to Conchol. N. 3. p. 36. 

 Habilat in insula Jamaica. 



478. H. rotula Gould. f 



T. parva, discoidea, pellucida, nitida, electrina, H. sup- 

 pressae similis, umbilico iufundibuliformi profunde perforata; 

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

 tura marginata; aperlura semilunaris; labrum simplex, haud 

 incrassatum. — Diam. 7^ poll. (G.) 



Helix rotula Goidd in Proc. Bost. Soc. 1848. p. 38. 

 Habitat in Tennessee. 



Obs. I. «Statura et colore Hel. indentatae, similiterque superno 

 sU'iata; anfr. numorosi et arcle convoluti ut in H. suppressa, sed um- 

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



Obs. 2. Nomen, si bona species est, mutandum ob H. rotulam Lowe. 



* 



479. limatula Ward. f Mon. I. p. 113. 



480. circumlincata Kiist. (Goll. 207. — Chemn. ed. 



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



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



nov. II. p. M3. — Hyaiina Alb. p. 67.) - - - H4. 



482 minuta Villa. -j- - - - 1U. 



483. H. eta Pfr. 



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

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

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

 cus latiusculus , perspectivus ; apertura parum obliqua , lunato- 

 subcircularis; perist. simplex, rectum, raarginibus conuiventi- 

 bus. — Diam. maj. 3, min. 2%, alt. \% mill. (CoU. Nr. 209.) 



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

 Habitat in Nova Seelandia (Strange). 



4S4. H. helicycloides Orbigny. 



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

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

 plana, medio subimmersa; anfr. 10 angustissimi, vix convexi- 

 usculi, ultimus rotundatus, non descendens, omnes in urabilico 

 latiores quam superne ; apertura obliqua , obauriforrais ; perist. 

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



