ZAUS. 155 



outer branch bearing on its external margin, near the 

 apex, three marked spines (fig. 8), each of which is 

 bordered externally with a closely appressed series of 

 radiating filaments, each group having much the appear- 

 ance of a minute hair-brush. Outer branch of the fifth 

 pair of feet in the female (fig. 9) elongated, quadrate, 

 bearing five terminal setas, and closely ciliated on the 

 outer margin ; inner branch short and broad, densely 

 ciliated, and bearing two long and two or three short 

 hairs : in the male, the inner segment is obsolete, the 

 outer not much different from that of the female. Caudal 

 segments short and broad ; inner tail-setae stout, about 

 as long as the abdomen, outer scarcely half as long. 

 Colour pale yellowish, the central body-segments some- 

 times tinged with lilac or blue. Length ^g-th of an 

 inch ('52 mm.). 



This species does not seem to be of very frequent 

 occurrence, but is perhaps commoner on the east coast 

 than elsewhere. It was first found by Mr. Goodsir in 

 the Firth of Forth, and I have taken it in several places 

 on the coasts of Durham and Northumberland, usually 

 amongst Laminaria saccharina or other Fuci. Dredged 

 in 10 12 fathoms amongst the Scilly Islands, and in 

 Ventry Bay on seaweeds. Mr. Norman has found 

 it amongst weeds in Balta Sound, Shetland, and 

 between tide-marks at Oban. 



