( 888 ) 
XVIII. Beseriptions of two new Shells. by Captain Frederic 
M Marryat, R.N. F.L.S. — 
Read February 18, di : 
MITRA. 
aa Mitra ZONATA. 
a. Tas. X. Fio.i, x 
' be ide luteA fromai 
nigris, columella quinque-plica 7 
Habitat in mare Mediterraneo. 
Anfractus basi nigri, crenato-striolati. 
tà, anfractibus inferne 
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. 
Tus X. FOS > 
C. testa alba, lineis longitudinalibus et transversis elevatis decus- 
santibus, inde cancellata. 
Habitat 
