300 



Ksterias endeca. 



or granules of a white colour, and connected by a sort of 

 network formed by cartilaginous lines, the interstices appear- 

 ing punctured. These punctures are red, and seem to serve 

 for the protrusion of the soft respiratory or aquiferous tubes. 

 The granules are surmounted with a crown of minute papillae. 

 Rays rounded, tapered rather suddenly from the base, very 

 flexible, and armed underneath with two series of pectinated 

 spines on each side of the tentacular furrow. The outer 

 series is narrower than the inner, which is continued forwards 

 to the mouth, while the outer is arched to the base, and joins 

 its fellow of the adjacent ray ; a triangular space, rough- 

 ened with pectinated tubercles, being thus formed between 

 the bases of the rays and the mouth. Under surface 

 yellowish. 



Berwick upon Tweed. [Received on April 16. 1836.] 



