MUREX. 91 



straightish, canaliculated, not laciniated^ and 

 pointed at their summit 5 transversely wrinkled 

 and striated; white, varying much in colouring 

 and markings; beak umbilicated and compressed; 

 throat tinted with reddish purple. Ti' W. 25. 

 18. 



M. RADIX. Ovate-globose, roundish, white, 

 with many varices, composed of black ramose 

 laciniated separate spines, which are more wide 

 than long ; spire very short, usually eroded ; tail 

 umbilicated, and short. 5. 



.c^#%. 



M. TRUNCULUS. Ovate, rough, with six or 

 seve^i spinous varices, transversely semi-granu- 

 larly furrowed and striated; whorls angulated, 

 with compressed tubercles crowning the shoulder. 



