S.MITH : MARINE SHtLLS FROM PORT ALFRED. 37 



Longit. 4 millim., diani. i. 



The embryonic sinistral shell forms a globose apex and consists of about 

 two and a half whorls. The ribs on the penultimate whorl are about twenty 

 in number and the spiral striae about ten. 



Trifopa fuseescens, n. sp. 



Pi. iii, fig 6. 



Testa parva, gracilis, fuseescens, quadricingulata, cingulo supremo aliis majori, 

 planiusculo, caeteris subaequalibus rotundatis ; anfractus circiter i8. fere 

 plani, ultimus cingulis septenis. prope aperturam lineis incrementi sectis et 

 subgranosis cinctus ; apertura parva, rotunde quadrata, antice brevissime 

 oblique canaliculata ; labrum tenue, postice ad suturam sinuatum, in medio 

 subpatulum, ad marginem leviter crenulatum. 



Longit. 1 1.5 millim., diam. 2.25. 



Some of the specimens named T. cim/ulatuH, A. Ad., by Mr. Sowerby 

 (Marine Shells of S. Africa, p. 36), belong to the present species. None 

 of them agree with Adams' species, which was described from the Red Sea, 

 and has strong longitudinal sculpture between the spirals. 



Trifopa fuseomaeulata, n. sp. 



PI. iii, fig 7. 



Testa elongata, gracilis, alba, fusco irregulariter maculata ; anfractus circiter 20 

 planiusculi, lente accrescentes, quadricingulati, cingulis tuberculatis, duobus 

 medianis aliis majoribus, longitudinaliter sulcati, subcancellati, ultimus infra 

 peripheriam cingulis tribus baud granosis ornatus ; apertura rotunde quadrata, 

 antice breviter oblique canaliculata ; columella supra arcuata. callo tenui 

 induta. 



Longit. 17 millim., diam. 3.5. 



Var. (PI, iii, fig. 8) Testa angustior, minor, cingulis tribus, superioribus 

 aecjualibus, distinctius et confertim tuberculatis. 



Longit. 15 millim., diam. 3 



The typical form is more distinctly blotched with brown than the variety. 



Trifora eonvexa, n. sp. 



PI. iii, fig. 9. 



Testa parva, fusca, ad apicem albida ; anfractus 10 convexi, supremi duo 

 pallidi, laeves, caeteri tricingulati, cingulis granosis, duobus inferioribus magis 

 conspicuis, sutura filiformi sejuncti, ultimus ad peripheriam rotundatus, cin- 

 gulis sex instructus ; labrum subpatulum ; columella callo crasso pellucido 

 induta, supra incurva. 



Longit. 5.5 millim., diam. fere 2. 



The suture is marked by the lira which encircles the periphery of the 

 body-whorl, and winds up the spire at, but above the actual suture. 



