404 HELIX 8. 4929, 
2617. H. biconvexa Martens. | 
«Testa anguste umbilieata, lentieularis, acute carinata, 
leviter striatula, lineis spiralibus subtilibus confertis sculpta, 
alba, fuscofasciata; spira plana; anfr. 4^, supra convexiusculi, 
ultimus utrinque aequaliter planatus, anüce deflexus et parte 
inferiore constrictus; apertura  subhorizontalis, securiformis, 
extus resupinata; peristoma vix incrassatum, album, superne 
rectum, subtus breviter reflexum, marginibus sat appropinqua- 
tis, supero rectilineo, infero arcuato. — Diam. maj. 26!/,, min. 
19, alt. 91/5; apert. long. 44, lat. 11 mill.» (v. M.) 
Helia biconveaa Mart. in Monatsber. Berl. Ak. 18 Jul. 1864. 
p. 526; Ostas. Zool. II. p. 317. t. 16. £f: 13. 
Habitat in insula Tavalli Minore Moluccarum. 
Obs. «Affinis H. Scheepmakeri, cujus facies infera omnino plana » 
* * 
* 
2618. (1942) parmula Brod. (Coll. Nr. 1294.) Obba A?. 459. — Ins. 
Philippin. (I. 394.) 
2619. H. Maclzensii Adams et Eeceve. 
T. latissime umbilicata, depressa, acute carinata, tenuis, 
superne confertim arcuato-striata, epidermide ad carinam longe 
ciliata vestita, fusco-cornea; spira vix conoideo-elevata, vertice 
subtili; anfr. 6!/, vix convexiusculi, lente accrescentes, ultimus 
antice breviter deflexus, subtus subtilius striatus, circa umbi- 
licum !/4 diametri occupantem turgidus; apertura perobliqua, 
angulato-lunaris; perist. tenue, marginibus convergentibus, su- 
pero expansiusculo, basali breviter reflexo. — Diam. maj. 30, 
min. 27!/;, alt. 10 mill. (Coll. Nr. 14295.) 
Helia Mackensiü Ad. et Reeve Voy. Samarang. Moll p. 60. 
t. 415. f. 6. (Nec Soul.) 
— elegantissima var.? Pfr. Mon. Helic. IlI. p. 253. 
Habitat Ty-pin-san insularum Meiacoshimas Maris flavi. 
* 
2620. (1943.) discus Desh. 4- — Habitat? (III. 252.) 
' 9691. (1244) cheiri Less. - — Nova Guinea. (I. 395.) 
2629. (1945. horizontalis Pfr. — Obba A?. 159. — Ins. Philippin. 
(LI 395.) 
2623. H. calcar Martens. | 
«Testa aperte umbilicata, depressa, lenticularis , superne 
cingulo elevato et ad peripheriam carina acuta munita, rugis 
grossis obliquis sculpta, nigricanti-fusca; spira fere plana; 
