t 



THE PIIGHER CRUSTACEA OF LIVERPOOL BAY. 245 



femrJes taken with the electric Jight. The general cha- 

 racters and the peculiar tridentate spinule at the extremity 

 of the telson agree with Sars' description. The spines, 

 however, on the inner edge of the inner uropods agree 

 rather wdth those of *S*. crassi2)es, Sars, (from which species 

 this differs in its longer limbs) in having no small spines 

 betw^een the larger, all being nearly equal in size and 

 set closely together, except towards the extremity. A 

 female examined had three setae on the inner margin 

 of the last joint of the peduncle of the upper antennae, and 

 two seta? on the distal extremity of that joint, which agrees 

 with Sars' figure. Length about 15 mm. from tip of an- 

 tennal scale to tip of telson. 



2. Mys'is oruafa, Sars. 



In Eeport I., p. 221,- I have erroneously recorded M, 

 sp'irit'us (Norman) for this species, wiiich is not uncommon 

 in Liverpool Bay. It may be knowai from M. spirltus by 

 its short, thick eye-stalks, and by having only five joints 

 in the tarsi of the anterior legs instead of seven to nine. 



3. Mijsis negleda, Sars. 



This species is sometimes abundant in tidal pools in 

 June and July. The colour varies Irom the faintest tint 

 of green (almost colourless) to dark olive-green. The 

 greater number were grass-e^reeii. All had the peduncle 

 and inner branch of the upper antenuie, the eyes, and tips 

 of both branches of the uropods, golden-yellow. The 

 fringes (setae) of the antennal scales and uropods were red- 

 purple. A large living specimen, which was of the usual 

 pale grass-green when taken out of the white dish in which 

 it was swimming, placed m a watch-glass on a black glass 

 plate, became in about an hour dark olive-green, while a 

 smaller and almost colourless specimen lost what little 

 colour it had. Some specimens were much infested on 

 the head and thorax by an EpistyUs. This species differs 



