THALESTRIS. 139 



equal (fig. 17) ; first joint of the inner branch having 

 a series of cilia along the proximal half of the inner 

 margin, and a long seta near the middle ; two terminal 

 claws on the last joint, which, like the preceding joints, 

 is very short ; outer branch densely ciliated along the 

 outer margin, the elongated second joint armed near 

 the middle with a long pectinated spine ; the short 

 terminal joint bears five long claws, some of which are 

 finely ciliated. Inner joint of the fifth pair of feet 

 broad and short (fig. 19) ; margin clothed with short 

 cilia, bearing two long ciliated seta? at the outer angle, 

 and two shorter ones more internally; outer branch 

 elongated, subquadrangular ; outer marginal portion 

 hispid, inner margin closely ciliated ; apex broad, and 

 armed with several short spines. Lateral margins of 

 the abdominal segments finely aculeate ; caudal seg- 

 ments short and broad. The animal (according to 

 Boeck) is of a brown colour, banded with red across 

 the second and third segments of the body, and first 

 and last abdominal rings. 



One specimen only was found in dredged material 

 from a depth of forty fathoms off St. Agnes (Scilly). 



This species was removed by Boeck from the genus 

 Thalestris, on the ground of the eyes being widely 

 separate and placed towards the sides of the head, 

 a character represented in my figure from a drawing 

 kindly sent to me by that lamented naturalist. This 

 ground of generic separation seems to me, however, 

 scarcely sufficient to warrant the breaking up of 

 the older genus, which is not yet so overgrown as 

 to require disintegration on the 'score of convenience. 



