15 



MUREX tricarinatus. 

 TAB. CCCCXW I. —fig. 1. 



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, Brander, fig. 77, 78, 79, 

 and 80. Murex tricarinatus, Lamarck Hist. 

 Nat. VII. 177. 



Between each of the beautiful, plaited, leaf-like sutures, 

 is an obtuse elevation or tubercle ; the striaj 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. CCCCXV1.-^V. 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 canaliculated 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 J it occurs sparingly at Barton, generally im- 

 perfect. 



