13 
MUR EX tricarinatns. 
TAB. CCCCXVI. —fig. l. 
Spec. Char. Ovate oblong, transversely 
striated ; sutures in three rows, foliaceous, 
dentated, bearing one spine upon the upper 
part of each; aperture obovate ; canal re- 
curved. 
Syn. Murex asper, 13 r cinder, fig. 77, 78, 79, 
and 80. Murex tricarinatns, Lamarck Hist , 
Nat. VII 177. 
Between each of the beautiful, plaited, leaf-like sutures, 
is an obtuse elevation or tubercle ; the striae are about 
seven, and elevated, corresponding with the plaits of 
the sutures ; the lip is toothed within, the canaliculated 
spine that proceeds from its upper part varies in length : 
the French specimens which are besides often larger, 
have it generally very short; the sutures consist of 
many laminae. 
We are indebted to Miss Dent and Miss Tylee for the 
Barton specimens here figured. 
MUREX bispinosus. 
TAB. CCCCXVI.— 2. 
Spec. Char. Ovate elongated, with three rows 
of foliaceous sutures, and two or three trans- 
verse' ridges ; sutures simple, bearing two 
concave spines to each whorl ; canal nearly 
straight. 
A. longer formed shell than the last : the projecting 
part of each suture consists of a single smooth lamina 
applied against two canalicuiated spines ; the surface of 
the whorls is nearly smooth, without any elevation be- 
tween the sutures. 
Miss Dent favoured us with this new species in 1820 : 
we have since received it from our kind Friend, the Rev. 
T. Cooke; it occurs sparingly at Barton, generally im- 
perfect. 
