214 LIFE BY THE SEASHORE. 



the East Coast, and which is interesting on account of its 

 colour. This is My sis lamornce, a delicate little creature 

 not much more than one-third of an inch long, and wholly 

 or partially of a bright red colour. It is often in large 

 part perfectly transparent, but is suffused with scarlet and 

 bears bright scarlet eggs. It may be found under stones 

 far out on the rocks, and may be recognised by the very 

 large eyes borne on short stalks, and by the fact that the 

 antennal scale is the same length as the peduncle of the 

 antennule, and that the telson is cleft for one-quarter of 

 its length, without spines in its upper portion, and furnished 

 distally with six to twelve at either side. The distribution 

 of this species in Europe is wide, for it ranges from Lofoten, 

 on the coast of Norway, through the Mediterranean to the 

 Black Sea. The colour is also worth notice, for bright red 

 is common in deep-sea Crustacea and in pelagic forms, but 

 is rare in those found near the shore. 



In the above species the specimens found are much more 

 likely to be females than males. When found the males 

 may be recognised by the absence of the brood pouch, the 

 slimmer form, and the nature of the swimmerets. The 

 third and fourth of these are much better developed than 

 in the females, the fourth being furnished with a long 

 many-jointed whip-like structure. 



We shall not here describe any other of the British 

 species of Mysis, but a not uncommon form which is now 

 referred to another genus is worth notice. This is Siriella 

 armata, found in rock pools in company with Mysis 

 flezuosa, but distinguished by its smaller size and more 

 delicate appearance. It is referred to a different genus 

 because the outer branch of the last swimmerets is divided 

 into two joints, the carapace is prolonged anteriorly into a 

 long rostrum instead of ending in a blunt point, and all the 

 swimmerets of the male except the first are well developed, 

 some of them being furnished with a curiously coiled pro- 

 cess. In the species named the rostrum is as long as the 

 antennal scale, both being slightly shorter than the stalk of 

 the antennules. The telson is very long, not cleft, slightly 

 constricted at its base, its margin being furnished with a 

 few short spines placed between longer ones. This species 

 is difficult to distinguish from other closely related species 



