14 



PROCEEDINGS OP THE MALACOLOGICAL SOCIETY. 



coiTugata ; iimbones erosi, longe ante medium siti ; pagina interna 

 albida, margaritacea, iridescens ; dentes anteriores rugosi, posteriores 

 tenues, elongati ; cicatrix antica mediocriter profunda, postica levis, 

 vix impressa. Long. 26, alt. 15, diam. 105 mm. 



Hob. — Lake Mweru. 



This species varies considerably in form and sculpture. Some 

 specimens are much longer than others, and the amount of corrugation 

 towards the umbones varies considerably. Some examples are almost 

 entirely smooth, whereas occasionally the wrinkling may extend over 

 two - thirds of the surface. The valves are white beneath an 



olive-brown periostracum, which almost invariably exhibits one or 

 more green rays down the hinder slope. There is in most specimens 

 a kind of lunule in front of the umbones, which varies much in shape, 

 being quite broad and diamond-shaped in some shells and quite narrow 

 and linear in others. 



An elongate example is 29 mm. in length and 14 in height. 

 A shorter specimen is 20*5 mm. long and 12'75 high. 



MlJTELA HaEGEEI, U.Sp. 



Testa irregulariter triangularis, alata, valde compressa et insequi- 

 lateralis, albida, periostraco olivaceo induta, lineis incrementi striata, 

 lineis tenuissimis radiantibus confertis subviridibus undique picta ; 



^v?W7?T^... 







latus anticum breve, oblique curvatum, posticum latissimum, supra 

 obHque truncatum ; margo ventralis late curvatus ; valvse tenues, 

 in medio ab umbone ad latus posticum paulo elatae vel porcatse ; 

 pagina interna albida, margaritacea, iridescens ; linea cardinis simplex ; 



