IIELIX §34. 143 



basali, horizontaliter circa umbilicum protraclo. — Diam. maj. 

 72/3, min. 71/2, alt. 4V2 mill. (Coll. Nr. 377.) 



Helix bursalella a Goiild in Proc. Bost. Soc. 1846. p. 175 et 

 Exped. shells p. 2^. Ed. alt. p. 5t. f. 5 2. 



— — a Pfr. Monogr. I. p. 185. 



— — Pfr. in Zeitschr. f. Malak. 1849. p. 72. 



— — Chenm. ed. II. Hehx N. 779 t. 125. f. 23 — 25. 

 ~ — (Endodonla) Albers Helic. p. 89. 



— hirricida Hombr. et Jacqninot Voy. Pol Sud. Moll. 1. 6. 



f. 21—24.^ 

 Habilat in insulis Tahiti et Eimeo. 



750. H. Jacquinoti Pfr. 



T. umbilicata, fornicato-conoidea, solidula , acute carinala, 

 confertim arcuato-costata, albo et fu.sco variegata, haud nitens; 

 spira conoidea, oblusa; anfr. 8 angusti, omnes carinati (carina 

 exserta, compressa, costis decurrentibus denticulata), ultimus 

 basi conve.xiusculus, radiatim striatus, umbilicus extus lamina 

 horizontali coarctatus, intus latus; apertura depressa , securi- 

 formis, lamellis 6 intrantibus munita: 2 in pariete aperturali 

 elongatis, I columellari et 3 in margine basali profundis, vix 

 conspicuis; perist. simplex , rectum, acutum, niargiue basali 

 in laminam umbilici introitum circumclaudentem continuato. — 

 Diam. maj. 9, min. 8V2, alt. 5 mill. (Coll. Nr. 378.) 



Helix hursatella ^ Gould in Proc. Bost. Soc. 1846. p. 176 et 

 Exped. shells p. 22. 



— — P Pfr. Monogr. I. p. 1.85. 



— excavata Hombr. et Jucq. Voy. Pol Sud. MoII. t. 6. f. 



9 — 12. Nec Bean. 



— Jacquinoti Pfr. in Proc. Zool. Soc. 1849. p. 128 et in 



Zeilschr. f. Malak. 1849. p. 73. 



— — Chemn. ed. U. Helix N. 780. t. 125. f. 26 — 28. 

 Habitat in insula Tahiti et in insulis Marquesas. 



751. H. cavernula Hombron ct Jacquinot. 



T. umbilicata, depressa, distanter arcualo-costata et sub 

 lente subtilissime spiraliter striata, fuscula , brunneo tessellata, 

 haud nitens; spira fornicata, superne depressa; anfr. 8V2 an- 

 gusti, carinali, ultimus infra penultimum recedens, tertiam 

 paginae inferae penultimi partem liberam relinquens, basi vix 

 convexiusculus, obsolete radiatim costatus, dislinctius conccn- 

 trice striatus; umbilicus latus, extus lamina horizontali coarcta- 

 tus; apertura depressa, securiformis, lamellis 6 intrantibus 

 uiunita: 2 in pariete aperturali, 2 in margine basali, \ in su- 

 pero, i dentiformi in columella; perist. simplex, rectum, acu- 



