APPENDIX. 525 



The pereion has the first segment short, each segment 

 gradually increasing in length posteriorly to the third segment 

 of the pleon. The eyes are vertically of an oblong oval form. 

 The first pair of antennae have the flagellum vertically and 

 longitudinally flattened, the inner surface being furnished 

 Avith two central rows of cilia, the cilia in one row being 

 directed upwards, and in the other downwards. The second 

 pair of antennae are slender, cylindrical, not longer than the 

 superior, articulations variable. The gnathopoda are subequal, 

 small. The first two pairs of pereiopoda robust, subequal. 

 The third and fourth pair subequal, longer than the preceding, 

 but not more than one-third ; propodos having the anterior 

 margin fringed with fine row^s of short teeth. The posterior 

 pair of pereiopoda ai-e scarcely half the length of the pre- 

 ceding. The pleopoda are subequal, reaching beyond the 

 extremity of the telson, having the approximate margins only 

 of the rami fringed with short sti'ong spines. Colour reddish 

 orange spotted with black. 



Hitherto the species of this genus have been taken only 

 as pelagic in tropical or subtropical latitudes. Tt is an 

 interesting fact that this species should have been taken oflf 

 the coast of Banff, from whence it was sent to us by that very 

 successful observer, Mr. Edward, who in writing says : "I can 

 say little as to its habits. I took eleven, and kept a few alive 

 for a short time, but observed nothing in their manners beyond 

 that which may be seen in the majority of si:)ecies. I supplied 

 them with plenty of sand, and also a few marine plants, but 

 they neither seemed to be burrowers nor climbers, as they 

 never went into the one nor appeared to care for the other. 

 They, however, swam a little. This they do somewhat after 

 the manner of CalHsoma crenata ; or, in other words, they rise 

 gradually from the bottom until they reach the top ; then 

 putting on more power, they dash round and round the vessel. 

 With close observation I observed that the superior antennse 

 were kept pretty well up and veiy widely apart, whereas the 

 inferior were always directed downwards. All the legs were 

 kept doubled up. I never saw them stretched out. They 

 would then sink once more to the sand at the bottom. Here 

 they would rest, sometimes a few minutes, sometimes longer. 



