fquare: on the contrary, in the M. papalis they are 
of a very deep or brownifh red, as well as much 
more irregular in their form. Both are natives of 
the Indian ocean, and, when recent, are covered 
with a thin, yellowilh-brown epidermis or cuticle. 
The inhabiting animal is faid to be of a poifonous 
nature, and to w^ound thofe who touch it with a kind 
of pointed trunk. 
