206 HELIX §. 44. 



umbilicus mediocris, pcrvius; apertura securiformis; perist. sim- 

 plex , margine supero antrorsuin arcuato, acuto, basali reflexo. — 

 Diam. maj. 14^2, min. 13, alt. Ty^ mill. (Coll. Nr. 313.) 

 Jklix nigritelhi P[r. in Phil. Icon. II. 9. p. 4. Helix t. G. f. 8 

 — — Chemn. cd. II. Helix N. 6 02. t. 9 4. f. 1—4. 



Ilabitat in insulis oceani pacifici (Cuminp;). 



01)s. Varial testa magis minu.sve depressa, inlprcliini conica (diam. 11'/^, 

 alt. 9 mill), umbilico latiore et angustiore. 



.538. H. approximata Le Guillou. ■{- 



T. discoidea, conico-depressa, umhilicata, carinata, fusca, 

 cinereo-lutescente variegata; anfr, 6 — 7 subconvexi, basi de- 

 pressi, ullimus margine acutus, subtus convexus, radiatim tenui- 

 ter striolatus , striis concentricis signatus; spira conico-depressa ; 

 umbilicus profundus ; apertura oblique quadrata , incrassata, an- 

 terius acuta, superne producta, exteriusque compressa. — Diam. 

 17, alt. 11 mill. (Guill.) 



Helix approximata Le Guill. in Revue zool. 18 42. p. 139. 

 Habitat in insulis Ternate et Hogoleu. 



Obs. «Affinis H. exclusae Fer. » 



539. H. trochiformis Fcrussac. 



T. umbilicata, solida, trochiformis, apice obtusa, basi plana, 

 acute carinata, oblique ruguloso-striata, saturate rufa vel fusco- 

 lutea, nigricanti-fasciata; anfr. 6 supra carinam prominentem, 

 stramineam convexiusculi; umbilicus angustus, pervius; apertura 

 irregulariter rhombea; perist. superne simplex, rectum, antror- 

 sum dilatatum , margine columellari recte descendente, subdila- 

 tato, basali reflexiusculo. — Diam. maj. 16'A, min. 15, alt. 9 — 

 10 mifl. (CoU. Nr. 314.) 



Ilelix trochiformis (Helicella) Fdr. pr. 301. ct Mus. ! 



_ _ pfr. Svnib. II. p. 40. 



_ _ Chemn. ed. II. Helix N. 68. t. 1 3. f. 7. 8. 



Carocolla circumdata Miihlf. Ant. Verz. p. 40. N. 146 4. 



Habitat in insulis Taheili et Opai^a (Ant.); Isle de France (Fer.) 



540. H. scrrula Benson. 



T. anguste umbilicata, subdepressa, subconoidea, corneo- 

 albida , subtus convexa , apice acuta ; anfr. 7 supra confertissime 

 radiatim plicati, marginati, marginibus elevatis, ultimus infra 

 laevior, peripheria marginata, serrata; apertura angulato-lunaris; 



