Zoological Society, 537 



lines are rounded, and radiate very regularly from the open umbili- 

 cus. The chestnut line that borders the sharp dentated edge of the 

 angle of the body-whorl is, beneath, interrupted with white bead- 

 like elevations. All the four chestnut lines of the body- whorl can 

 be seen through the shell when it is placed with the lower side up- 

 permost. 



Helix (Carocolla) Zebuensis. Car. testa complanato-convexd, 

 solidd, subumbilicatd, purpurascente ; lineis incrementi obliquis 

 creberrime striata; suturis acutis subelevatis ; anfractu's basalis 

 angulo acuto ; aperturd cceruleo-albd, acuto-auriculari ; labii limbo 

 nigro-castaneo, subexpanso, subacuto ; epidermide fused, subcrassd. 

 Long, § ; lat. If poll. 



Hab. ad Dalaguete in insula Zebu, foliis arborum hserens. 



Var. a. Albido-fusca nigro-castaneo interrupt^ lineata et maculata. 



In this variety the edge of the whorls above the suture is consi- 

 derably elevated with a gutter or furrow on the upper side. The 

 brown interrupted lineations take the form of bands running in the 

 directions of the whorls, and the lower side of the body-whorl is 

 marked immediately under the edge of the angle with a circle of 

 large, well-defined, tessellated spots, which reach to the edge of the 

 angle of the whorl. 



Var. b. Fusca anfractibus suturam juxta obscure maculatis. 



In this variety the angle of the whorl next to the body-whorl is 

 elevated, but there is no gutter above. 



Var. c. Albescens, suturis et anfractu's basalis angulo nigro-castaneo 

 maculatis, infra nigro-castaneo creberrime tceniata. 



In this variety there is no elevation of the suture ; the broad tes- 

 sellated band near the angle of the body-whorl below, and the in- 

 terrupted spotted and lineated bands which ornament the lower side 

 of the shell, are neatly and prettily disposed. 



Var. d. Fusco- albescens rubro-brunneo oblique strigata. 



In this variety the edge of the penultimate whorl is elevated, and 

 has a slight gutter on the upper side. The shell beneath is ob- 

 scurely lineated in the direction of the whorl, and the red- brown 

 dashes radiate from the angle of the whorl to the interrupted linea- 

 tions which gird it. On the upper side the bold oblique stripes of 

 the same colour completely cross the whorls. 



Var. e. Tota fusca. 



In this variety the angle of the upper whorls is very much ele- 

 vated. 



The ground-colour of all these varieties is a purple or red-brown, 

 and the pattern of the variegated specimens resides in the epidermis, 

 or rather is produced by the intermixture of the ground-colour of the 

 shell and of the epidermis. Thus, if any of the variegated varieties 

 be immersed in water, the pattern vanishes as long as the shell re- 

 mains wet ; when it is dry, the pattern is restored. If, for instance, 

 var. a. and var. e. be immersed, the general colour becomes identi- 

 cal, and the dark interrupted lineations of the former can hardly be 

 traced. The absence or presence of the elevation of the edge of the 

 upper whorls, in the different varieties of this species, shows that such 



