CONTRIBUTIONS TO THE BRITISH FAUNA. 247 



sutures joining a line, which runs along the side 

 of the pores, thus forming rhomboidal compart- 

 ments. In the centre of each of these compart- 

 ments, there is a large tubercle, with a few smaller 

 ones. Thus, there are but two rows of spines in 

 €ach of the spaces between the pores. The sides 

 and middle of the larger spaces are nearly smooth. 

 Alius vertical, circular, a little raised, closed by a 

 coriaceous wrinkled muricated lid. Mouth beneath, 

 central, circular, covered with a thick skin, beset 

 with tufts of small spines. 



This is a more depressed species than the E, 

 esculent us. The spines are by no means so nume- 

 rous, and a part of the spaces between the pores is 

 smooth, which, in the other, is thickly set with spi- 

 nules. The teeth resemble those of E. esculentus, 

 but the jaws are a little more obtuse. The spines 

 are stronger, blunt, finely streaked, and some of 

 them are upwards of an inch in length* 



This specimen was found in deep water at the 

 mouth of Sellavoe, Zetland, where I have also 

 observed the following species : Echinus esculen- 

 tuSy there called Scaad (scabbed) man's head, A 

 species nearly allied to E, spataguSy termed the 

 sea-mouse. E, cidariSf or Piper, The two last 

 inhabit deep water. E. pusillus, often cast ashore, 

 but never found with the spines. Professor Jame- 

 son found the £. placenta. I never observed the 

 £. lacunosus in Zetland, although it is frequent in 

 the Frith of Forth. — (Communicated 9th Decem- 

 ber I8O9.) 



^4 



