IIELIX §.24. 123 



dus; apertura perobliqua, depresse securiformis ; perisl. siuiplex, 



rectuui, margiue columellari subincrassato, — Diam. maj. 16, 



min, 14, alt. 5 mill, (Mus. Cuming.) 



^ Helix Stvainsoni Pfr. in Proc. Zool. Soc. 1846. p. 28. 



Habitat in insula Tahiti (Tucker). 



318'. H. Troilus Gould. f • 



T. variabilis, depresso-conica, subdiscoidea, leviter etobtuse' 

 striata, flavescens, sulDtus convexa, in umbilicum amplum incur- 

 vata, carinata: carina utrinque linea spirali castanea marginata 

 (interdum coloribus inversis); anfr, 5^2 rotundati; apertura se- 

 milunaris, superne angulata; labrum acutum. — Lat, %, alt. 



i^y.opou. (G,) 



Helix (Caracolla) Troilus Goidd 18 46. Exped. shells p. 23. 



Habitat in insulis Samoa, 



Obs. «Haud dissimilis H. explanalae Quoy, sed minor, magis iimbili- 

 cata , etc. » 



318'. H. Cressida Gould. -^ 



T. variabilis , solida, depressa,. lenticularis'^' acut^carinata, 

 nitida, dense et acute striata, coloribus flavo-viridibus et casta- 

 neis coalescentibus fasciata, infra subplanulata, umbilico magno 

 et profundo perforata; anfr. 5 vix convexi; apertura triangularis ; 

 labrum acutum; faux lilacina, — Lat, yio, alt, y* poll, (G.) 



Helix Cressida Gould 1846. Exped. shells p. 23. 

 Habitat iii ins. Samoa et Taheiti. 



b s. «Forma fere sicut H. acies , sed sublus planior el minor.» 



319. H. acutimargo Ptv. 



T, umbilicata , depressa , . supra planiuscula'^ '^asi couvexa, 

 tenuis , pellucida , pallide cornea , acute carinata , supra carinam 

 striis nonnullis confertis, concentricis notata; anfr. 6 lente accre- 

 scentes; umbilicus mediocris, pervius; apertura angulato-Iunaris; 

 perist. simplex, acutum, — Diam, maj. 16, min, 14 /2, alt. 6 mill. 

 (Cofl. Ni\ 167,) 



Helix amtimarcjo Pfr. in Proc. Zool. Soc. 18 45. p. 40. 

 — — Chemn. ed. U. Hehx N. 620. t. 97. f. 1 —3, 



Habitat in insula Negros Pliilippinarum (Cuming), 



Obs. Similis spociminibus jiinioribus H. compressae , qualia circa Fiume 

 legi, a quibus diffcrl umbilico angustiore, anfraclibus anguslioribus el sculplura. 



320. H. radula Pfr.y^.y^J^lm^J^jn 

 T, umbilicala, depressa, sublenticularisfsolidiuscula, pallide 

 cornca, carinata, striis incremcnti confertis et lineis acute promi- 



