306 
GAMMAKIDiE, 
articulated about one-third from the apex, and tipped 
with a long spine-like hair. The central tail-piece has 
the inner margin of each division straight, the outer 
rounded, and furnished at the apex with one or two 
hairs. 
We have only seen this animal when dead ; but the 
skin is very thin and transparent, and appears to contain 
no colouring matter; neither have we been enabled to 
detect any eye. These circumstances, together with its 
having been hitherto taken only in muddy and sandy 
bottoms, suggest the idea that it is a burrower in the 
mud. It was first taken at Wisby, on a sandy bottom, 
at from eighteen to twenty fathoms of water, by Prof. 
Lindstrom, who also captured it at Lanskrona. It has 
been taken by Prof. Williamson, on a fine sandy bottom, 
off Weymouth ; and Mr. Webster has dredged it near 
Tenby. 
