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XVIII. Descriptions of two new Shells. By Captain Frederic 



Marryat, B.N. F.L.S. 



Read February 18, I8I7. 



MITRA. 



MiTRA ZONATA. 



Tab. X. Fig. 1, 2. 

 MiTRA epidermide luteS, fulvo-marmorati, anfractibus inferne 



basi nigris, columeM quinque-plicatS. 

 Habitat in mare Mediterraneo. 

 Anfractus basi nigri, crenato-strinlati. 



This shell was taken up near the port of Nice in the Mediter- 

 ranean, adhering to a sounding-lead, in very deep water. I have 

 no hesitation in pronouncing it to be a new species, as I cannot 

 find it described by any author. 



CYCLOSTREMA. 



CHARACTER GENERICUS. 



Testa depressa, perspectivo-umbilicata ; apertura circularis. 



Cyclostrema cancellata. 



Tab. X. Fig. 3, 4. 



C. testa albfi, lineis longitudinalibus et transversis elevatis decus- 



santibus, inde cancellata. 



Habitat 



