PLATE LXXXVI. 



]VIUREX DECOLLATUS. 



SHORTENED MUREX, 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 lasvl, patulo-subcaudata, 

 spira in capitulum desinentc. 



Somewhat ventricose, smooth, mouth produced. Spire terminated 

 in a capitulum or knob. 



MuREx Decollatus. Penn. Br. Zool. T. 4. p. 125. sp, 102. 



Pennant oiFers 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 all the specimens we have examined exhibit the 

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

 rank 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. 



