890 



Cerith. testa pyramidali, parva, pallide fulva, acuta^ loiigitudina- 

 litei- plicata ; anfractibus distiiictis, spiralitcr costatis, costa infe- 

 riore maxima; apertura cxpansa; canali subproductOj tortuoso. 



Small, pale fawn, sharp, longitudinally ribbed, crossed by nar- 

 row ribs, the lowest of which on each whorl is large. The aper- 

 ture is expanded, and terminates in a slightly produced, tortuous 

 canal. Island of 13ureas, Pliilippines, H. Cuming. 



2 c. Shaped like a Trochus, many -whor led ; columella twisted. 

 — Genus Telescopium, Schumacher. 



179. Cerithium telescopium (pi. clxxxv. f. 269), Linnaeus 

 (Trochus), T. Linn. Syst. Nat. Trochus, no. 600. Telescopium 

 fusca, Schm. 



Cerith. testa conica, fusco-nigricante, spiraliter planulatim sul- 

 cata; anfractibus angustatis, numerosis, ultimo basi planulato, 

 spiraliter costellato; apertura quadrilabra; columella alba, tor- 

 tuosa; labio externo antice producto, denticulato, postice emar- 

 ginato ; operculo corneo, rotundato, multispirali. 



Tliis well-known conical species is believed by anatomists to 

 have affinities with the Trochidm, rather than with the genus now 

 before us. With these questions we have little to do at present, 

 but conchologically the shell appears very suitably placed near the 

 group to wliich C.fuscatimi and C. radula belong. Philippines, 

 //. C. Singapore, Malabar, etc., Auct. 



% d. Fluviatile, many whorls ; columella tortuous ; outer lip 

 produced in front ; shell generally covered hy an epider- 

 mis. — Genus Tympanotomus, Klein. 



180. Cerithium fdscatum (pi. clxxxvi. f. 300, 301), Lin- 

 nmis (Murex fuscatus), Linn. Syst. Nat. ed. 12. p. 755. Ceri- 

 thium muricatum, Brug., Diet. no. 27. Strombus tympauorum 

 aculeatus, Chemn., Conch, v. 9. t. 136. f. 1267, 1268. C. mu- 

 ricatum, Soiverhy. 



Cerith. testa elongata, epidermide fusca iuduta, tuberculis acu- 

 leatis magnis paululiim adscendeutibus cincta; anfractibus una 

 serie tuberculatis, ad suturam graniferis, ultimo subtiis biseriatim 

 moniliferis ; apertura curta, subquadrata, superue angulata ; labio 

 externo Entice producto ; columella breviusculo ; canali emargi- 

 nato. 



This well-known aculeated shell, with a brown epidermis, fre- 

 quents the mouths of rivers in West Africa. 



