PLATE LXXXVI. 



MUREX DECOLLATUS. 



SHORTENED MUREX y OR ROCK SHELL. 

 GENERIC CHARACTER. 



Spiral, rough, the aperture ending in a strait, and somewhat 

 produced gutter or canaliculation. 



SPECIFIC CHARACTER. 



Murex Decollatus: testa ventricosa laevi, patulo-subcaudaia, 

 spira in capitulum desinente. 



Somewhat ventricose, smooth, mouth produced. Spire terminated 

 in a capitulum or knob. 



Murex Decollatus. Penn. Br, Zool. T. 4./;. 125. sp. 102. 



Pennant offers his Murex Decollatus as a species with doubts. It 

 has certainly the appearance of a shell much mutilated, or of extraor- 

 dinary growth ; but as ail the specimens we have examined exhibit the 

 same appearance, we have ventured to assign it a new character, and 

 fank it as a distinct species. 



It is a rare shell on the British shores, said to have been found on 

 those of Cornwall and Devonshire. 



