348 Quarterly journal of Coiuhoiogy. 



become almost obsolete ; aperture small, not equalling half the 

 entire length of the shell, witliin coated with a white opake enamel 

 and streaked here and there rather indistinctly by the exterior 

 brownish stripes ; columella coated with a thin white callosity, 

 which extends as far as the upper extremity of the outer lip ; it is 

 a little arcuated and rather abruptly but obliquely truncated at the 

 basal end ; peristome simple, regularly curved, and thin. 



This species, of which I have seen only a single specimen, 

 agrees in form very fairly with A. porpJiytostonia, Shuttleworth, 

 with the exception of the spire being a little less obtuse, and in 

 coloration it reminds one very much of A. Zebra. 



Achatina dimidiata. 



Testa ovata, tenuis, kris, supcriw fusca paruin nitida, injerne vires- 

 ceiiti-flaiescens polita ; spira couica, apice obtuso ; anfradus 

 6y2-7, stipe r lores convexluscull llnels Increment I al usque sp I rail- 

 bus subrugose granulatl, sutura crenulata sejunctl ; ultlnnts 

 viagnus, ventrlcosus, su[-erlorlbus Iccvlor, supra vu\llunt fusces- 

 ce/is, Infra abrupte vlressentl-flavus et Lcvlgatus ; apertura 

 vertlcalls, subo7'alls, supra acuminata, Vitus callo ccBruleo-albo 

 induta ; columella siihperpendlcularls paruin externe arcuata, 

 7VSC0 pallldlsslme tlncta : peristoma tenitc simplex, marglnlbus 

 callo tenulsslmo junctls. 

 Long. 80 mill. ; dlam. jp. Apert. long. 4^, dlam. 26. 



Shell thin, light, divided into two differently colored portions, 

 the upper section above the middle of the body-whorl being of a 

 uniform dull-brown color and displaying very little gloss on the 

 surface, the lower division is polished and greenish-yellow or olive, 

 streaked here and there longitudinally with a darker tint. Whorls 

 about seven in number, the upper ones moderately convex, and 

 sculptured with somewhat coarse granulation, which is formed by 



