46 
Hexrx (Carocotta) Zesuensis. Car. testa complanato-convera, 
solidd, subumbilicatd, purpurascente ; lineis incrementi obliquis 
creberrim® striatd ; suturis acutis subelevatis ; anfractis basalis 
angulo acuto ; aperturé caruleo-alba, acuto-auriculari ; labii limbo 
nigro-castaneo, subexpanso, subacuto ; epidermide fusca, subcrassa. 
Long. 3; lat. 14 poll. 
Hab. ad Dalaguete in insula Zebu, foliis arborum herens. 
Var. a. Albido-fusca nigro-castaneo interrupte 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 anfractés basalis angulo nigro-castaneo 
maculatis, infra nigro-castaneo creberrime teniata. 
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- 
eal, 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 
a conformation cannot be trusted as a specific character. The animal 
is a dark purplish brown.—W. J. B. 
Mr. Yarrell exhibited a British example of the Motacilla alba of 
