17 
exists between Mitra pertusa, Soland., and M. millepora, M. 
cardinalis, M. archiepiscopalis, M. versicolor, and M. sangui- 
nolenta, of Lamarck, I shall endeavour to explain in another 
place. 
MUREX PINNATUS. 
(Lot 52.) 
M. (div. fimbriati) testd candidd, varicibus tribus, longitudinalibus, 
tortis, fimbrid tenui, dilatatd, radiatd, margine undulato, ornatis, 
armatd ; spiré productd ; canale elongato, arcuato; lalno exte- 
riore denticulato. 
Shell snowy white, with three twisted longitudinal varices, which 
are surmounted by a thin, dilated, radiated fringe, having the 
margin undulated; spire produced, channel lengthened, 
curved; outer-lip crenately toothed. 
Martini, vol. iii. pl. 111, fig. 1036, 1037. 
Tus beautiful shell belongs to a small group of the genus 
Murex, (consisting of about six or seven species) having the 
varices, or longitudinal folded ribs of the back, dilated. 
into a fringe. M. triqueter, figured by Born, and existing 
both in Mr. Broderip’s cabinet and my own, is nearly akin 
to this, but is a very distinct species. 
MONOCEROS IMBRICATUM. 
(Lot 325.) 
M., testdé costis imbricatis, transversis, imparibus, instructd ; labio 
exteriore spind intra marginem insertdé armato. 
Shell with imbricated unequal transverse ribs; outer lip with the 
spine inserted within the margin. 
Ency. Méthod. 396. fig. 1. a. b. Sowerby’s Genera, No, 5. f. 1. 
I'r is necessary to give the specific character of this species, 
to prevent its being mistaken for another very nearly allied 
to it. 
