10 STREPTyVXlS i?. 4. 



20. St. Trobcrti (Hclix) Pctit. f 



T. subglo])os;i, albida, poliLa, lucida, peiforata ; spiia obtusa : 

 anfr. 6; apcrtura postei'ius coarclala; coluuiella laruiua alba intus 

 decurrente insculpta; labruui sul)(|uadratuni, albuni, rellexuni, 

 basi denlibus 2 parvulis geminatis instructini). — Lont'. 6. lat. 4, 

 alt. 2/4 mill. (Pelit.) 



Helix Troberti Petit in Revue zool. 1841. p. lOO. 



— — Phil. Icon. I. 3. p. 49. 



Streptaxis Iroberti Pfr. Synib. II. p. 110. 

 llabitat in Guinea. 



21. St. distorta (Helix) Jonas. 



T. pcrforata, depresso-ovata, cerea , tenuiuscula, diaphana, 

 superne confertissinie arcuato-striata; spira lateralis, ol)tusa: 

 sulura submarginata ; anfr. 5/4 vix convcxiusculi, ultimus infra 

 penullimum devians, lacvigatus, nitidus, anlice carinato-compres- 

 sus; apcrtur.i oblonga, subauriformis, anticc canaliculata , lamclla 

 intrantc parietis aperturalis coarctata; perist. album, reflexum. 

 marginibus subparallelis, dcxtro stricto, sinistro arcuato, basi 

 denle extus scrobiculura formantc munito. — Diam. maj. 10 '/2, 

 min. 6, alt. 3 mill. (Mus. Cuming.) 



Helix distorta Jonas in Phil. lcon. I. 3. p. 48. Helix l. 3. f. 3. 



Streptaxis distorta Pfr. Symb. III. p. 52. 

 Ilabitat in Guinca (Jonas), in insula Rodriguez (tcstc Mus. Cum.). 

 22. St. pyriformis Pfr. 



T. rimato-perforata, depresse pyriformis, tenuis, supernc 

 confertim striata, diaphana, cerea; spira latcralis, obtusa; anfr. 

 o'/2 subplanulali. pcnultimus dilatatus, subgibbus, ultimus antror- 

 sum valdc devians, basi lacvigatus, antice compressus, utrinquc 

 scrobiculatus; umbilicus rimam profundam exhibens, non per- 

 vius; apertura sul)tetragona, lamella triangulari, intrantc, basi 

 bifida coarctata; perist. reflexiusculum , album, marginibus stric- 

 tiusculis, parallelis, sinistro ct basali unidcnlatis, dextro dente 1 

 marginali ct altcro profundiorc munito. — Diam. maj. 10, min. 

 6/'2, alt. 3 mill. (Mus. Cuming.) 



Strcptaxis pyriformis Pfr. in Pliil. Icon. II. 9. p. 8. — II. 13. 

 p. 129. Hclix t. 8. f. 8. 

 — — Chemn. ed. H. Ileli.v t. 102. f. 31 -3 i. 



Ilabitat in insula Rodrigucz. 



23. St. abcrrata (Hclix} Soulcyet. 



T. pcrforata, ovato-globosa, subtilissimc arcuato-striata. ni- 

 lida, pcllucida, albido-viresccns; spira lateralis, convcxa, obtusius- 

 cula ; sulura submarginata ; anfr. 6 — 7 vix convcxiusculi , ultiinus 



