MUREX.— Plate XIII. 



ture. Instead of being furnished with a row of distinct 

 leaf-like fronds, they are oniamented thi-oughout with a 

 connected lamina forming festoons of open scales. 



Species 53. (Mus. Metcalfe.) 



MuEEX TRIFORMIS. Mur. testd trigono-ovatd, crassius- 

 ctda, transvernim liratd el corrugatd, tnberculis duohus 

 ant pluribus inter varices ; trifariam varicosd^varicibus 

 laminato-fmbriatis, svperne excavato-simiatis ; ferru- 

 gineo-fused ; aperturd ovatd, siiperne sinuald. 



The three-shaped Murex. Shell triangularly ovate, ra- 



ther thick, transversely ridged and wrinkled, with two 

 or more tubercles between the varices ; tluee vari- 

 cose, varices laminately ftilled, excavately sinuated at 

 the upper part ; rusty-brown ; aperture ovate, sinu- 

 ated at the upper part. 



Murex acantkropterm, var., Sowerby, Conch, lllus., 

 f. 51. 

 Hab. New HoDand. 



Several specimens of this shell have been lately received 

 from New Holland, and it is now generally regarded as a 

 species quite distinct from the Murex acaniliropterua. It 

 is of a more rude and solid structiu'e, and of a dark rusty 

 brown colour. 



