10 STREPTAXIS §. 4. 



20. St. Troberti (Heli^^) Petit. t^./-^-^^-^^^ 



T. subglobosa, albida, polita, lucida, perforata ;' spira obtusa ; 

 anfr. 6 ; apertura posterius coarctata ; columella lamina alba intus 

 decurrente insculpta; labrum subquadratum, album, reflexum, 

 basi dentibus 2 parvulis geminatis instructum. — Long. 6, lat. 4, 

 alt. 2/4 raill. (Petit.) 



Helix Troberti Petit in Rcvue zool. 1841. p, 100. 



— — Phil. Icon. I. 3. p. 49. 



Streptaxis Troberti Pfr. Symb. II. p. 110. 

 Habitat in Guinea. 



21. St. distorta CHelix) Jonas. / . ^ 



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

 superne confertissime arcuato-striata ; spira lateralis, obtusa; 

 sutura submarginata ; anfr. 5/2 vix convexiusculi, ultimus infra 

 penultimum devians, laevigatus, nitidus, antice carinato-compres- 

 sus; apcrtura oblonga, subauriformis, antice canaliculata , lamella 

 intrante parietis aperturalis coarctata; perist. album, reflexum, 

 marginibus subparallelis , dextro stricto , sinistro arcuato , basi 

 dente extus scrobiculum formante munito. — Diam. maj. 10 '/2, 

 rain. 6, alt. 5 mill. (Mus. Cuming.) 



Helix distorta Jonas in Phil. Icon. I. 3. p. 48. Helix t. 3. f. 3. 



Streptaxis distorta Pfr. Synib. III. p. 32. 

 Habitat in Guinea (Jonas), in insula Rodriguez (teste Mus. Cum.). 



22. St. pyriformis Ffr. ;;;:.. 



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

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

 572 subplanulati, penultimus dilatatus, subgibbus, ultimus antror- 

 sum valde devians, basi laevigatus, anticc compressus, utrinque 

 scrobiculatus ; umbilicus rimam profundam exhibens, non per- 

 vius; apertura subtetragona , lamella triangulari, intrante, basi 

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

 tiuscuhs, parallehs, sinistro et basah unidentatis, dextro dente 1 

 marginali et altero profundiore raunito. — Diam. maj. 1 , niin. 

 6/'2, alt. 5 mill. (Mus. Curaing.) 



Streptaxis pyriformis Pfr. m Phil. Icon. II. 9. p. 8. — II. 13. 

 p. 129. Helix t. 8. f. 8. 

 — — Chemn. ed.II. HeHx t. 102. f. 31 -34. 



Habitat in insula Rodriguez. 



23. St. aberrata (Helix) Souleyct. v;y/.f<?;v(./^ , V- 

 T, perforata, ovato-globosa, subtilissime ai-cualo-striata', ni-''' 

 tida, pcllucida, albido-vircscens; spira lateraiis, convexa, obtusius- 

 cula ; sutura subniarginata ; anfi'. (5 — 7 vix convexiuscuh , ultimus 



