Mr. Edear A. Smith on new Shells. 425 



i s 



Not B. Humphrey sianum of Moller, Lovdn, Micldcnclorff, 

 M. Sars, Danielssen, or Malm. 



6. Buccinum Totteni, (Tottenii) Stimpson. 



B. terree-nora (Beck), MiJrch. 



B. undulatum, ilanc. (not Moll.). 

 Var. B. plectrum, St. 

 Var. B. Packardi, St. 

 Var. Tr. simplex, Midd. 

 Var. B. Amalice, Verkr. 

 Var. B. elegans, Verkr. 



7. Buccinum tenue 7 Gray. 



B. scalariforme (Beck), Moll. 

 Tr. ochotense, Midd. 

 B. tortuosum, Reeve. 



8. Buccinum ciliatu?n } Fabr. 



B. cyaneum, Ilanc. (not Brug.). 



Tr. tenebrosum (as of Hancock), var. borealis, Midd. 



B. Molleri, Reeve. 



LVI. — Diagnoses of new Shells from Lake Tanganyika and 

 East Africa. By Edgar A. Smith *. 



Limnotrochus, gen. nov. 



Testa trochiformis, umbilicata, epidermide haud induta, spiraliter 

 lirata. Anfractus ultimus in medio carinatus. Apeitura intus 

 non lirata, labro exteriore obliquo, margine basali late sinuato, 

 coluniellari aliquanto rerlexo, calloque labro superne juncto. 

 Operculum comeum, paucispirale. 



Limnotrochus Thomsoni. 



Testa subsolida, anguste umbilicata, trochiformis, livide purpurea, 

 fusco notata, ad basim et suturam albida. Anfractus 7, plani, 

 declives, inferne late canaliculati, supra liris quatuor inajqualibus 

 granulosis (suprema et infima quam cseterae majoribus) cincti ; 

 anfr. ultimus in medio fortiter et subacute carinatus, infra medium 

 levitcr convexus, liris circiter 8 concentricis, plus minusve granu- 

 losis cinctus. Apertura subquadrangularis, intus supra carinam 

 purpurascens, infra pallida. Labrum tenue, obliquum. Margo 

 basalis late sinuatus ; columella arcuata, superne leviter refiexa, 

 labro callo juncta. 



Long. IS milliin., diam. 11 ; aperturae longit. 7| millim., diam. 6. 

 Hah. Lake Tanganyika (J. Thomson). 



* It is proposed to give elsewhere a full account of the collections of 

 which the .shells here described form part, with more detailed descrip- 

 tions and coloured figures. 



Ann. & Mag. N. Hist, Ser. 5. Vol vi. 30 



