HELIX-PLANISPIRA. 277 



H. ZONARIA Linne. PI. 44, figs. 4, 5, 6, 7, 8, 9, 10. 



Shell umbilicate, discoidal, spire a little concave ; white with 

 brown bands, above clouded, mottled or obliquely streaked with 

 brown ; bands not continued upon the lip ; latter half of base much 

 swollen, constricted behind the basal lip; a wide excavation behind 

 the columellar lip. 



Depressed, rounded tit periphery, very delicately striated, nearly 

 smooth, shining. Whorls 4J, convex, the earlier 2 sunken. There 

 is usually a band at the periphery, one above the periphery, a row of 

 spots or streaks inside of the upper band, and numerous narrower gray- 

 ish or brown spiral lines beneath. The last whorl descends in front. 

 Aperture very oblique, truncate-oblong, white with bands inside. 

 Peristome white ; upper margin broadly expanded, having usually 

 a, slightly projecting point in the middle ; basal lip reflexed, with a 

 rather long, obsolete tooth. Umbilicus permitting all the whorls to 

 be seen. Alt. 13, greater diam. 27, lesser 20 mill. 



Alt. 10, greater diam. 2H mill. 



Moluccas; Amboyne Is. (Amboyna, Ceram, Buru} ; Banda-Neira, 

 Banda Is. 



H. zonaria LINN. Syst. Nat. xii, p. 1245. PFR. Monogr. i, p. 

 386. YON MARTENS, Ostas. Zool., Landschn.p. 307, t. 16, f. 6-11 ; 

 t. 19, f. 6. TAPPARONE CANEFRT, Ann. Mus. Civ. Genov. 1884, 

 p. 151 (with color-varieties) ; 1. c. xix, 1883, p. 181, t. 7, f. 8 ; t. 9, 

 f. 1, 19 (full synonomy, distribution and anatomy). Planispira colu- 

 ber BECK, Index, p. 30. Helix coluber PFR., Monogr. i, p. 286. 

 REEVE, Conch. Icon. f. 500. H. collis (Mouss. in coll.) PFR. Novit. 

 Conch, iv, p. 36, t. 117, f. 1-3. See Martens Mai. Bl. xx, 1872, p. 

 153. H. dromedarius Mouss. in coll. 



One of the most abundant snails in the Amboyne Is. and very 

 variable in size and coloration. H. coluber is absolutely synonymous. 

 The species may be known by the row of streaks or spots above, the 

 subobsolete elongated tooth-like process on the basal lip, the swollen 

 base, and excavation behind the columellar lip. The two Linnsean 

 specimens of H. zonaria belong to the color-varieties lineolata and 

 fasciata. Specimens of this species often have an oblique dent-like 

 impression on the outer part of the whorl a short distance behind the 

 outer lip. 



H. zonaria stands midway between zebra and fasciolata. In zebra 

 the oblique streaks or spots cover the surface to the exclusion of the 



