168 MU. T. EDWARD OK THE tiri'JLltllDj:. 



being the most active species which, so far as I remember, I have 

 as yet seen. All three seem to me far more active in their whole 

 movements than either of their congeners, L. Kinahani or H. 

 galha, and they do much better in confinement. 



It strikes me very forcibly that these are what some would call 

 carnivorous in their diet ; at least I am pretty sure that H. ohlivia 

 is, and am inclined to think that the others are so likewise, from 

 the fact that their habits are so alike in every other respect. 



On one occasion I put a few individuals of Syperia ohlivia 

 beside some shrimps {Crangon, 3fysis, &c.). On looking again 

 some time after, I saw one of the Hyperics on the back of a Mysis. 

 I also observed the latter give some strange jerks with its tail, but 

 took no further notice of the circumstance, not dreading any- 

 thing serious. The shrimp was swimming at the time with the 

 burden on its shoulder. This was in the evening. Next morning 

 I found both at the bottom, still together, but the shrimp dead. 

 Tliis drew my attention more closely to the case, and I endea- 

 voured to drive the Hyperia away ; but, although I twirled him 

 with a camels'-hair brush for several minutes, I failed in my 

 object ; and it was not until I had the Mysis at the top of the 

 water that he condescended to let go. I then examined the 

 shrimp, and found an incision at the extreme end of the carapace, 

 and just where the soft part of the body commences, and so deep 

 that the animal broke in two on being again lifted. I am not 

 saying from this, however — at least I do not affirm it as a truth, 

 that the Hyperia killed the shrimp ; but I believe he did, and, by 

 way of making food, had scooped out the part alluded to. I have 

 lost shrimps in this way before, without very well knowing why. 

 I likcAvise find various of the softer species when cast on shore' 

 treated in the same fashion when the Hyperies, and especially S. 

 ohlivia, are on the coast. They appear well enough until you 

 attempt to take them up, when they in most cases break either 

 into two or three pieces. Fragments, too, are often throAvn up. I 

 know that JEurydice pulcJira, the little tyrant of the shore, is a 

 great enemy to the shrimp, and many others of his kind, but I am 

 much mistaken if some of the Hyperice are not something similar. 



It would seem that not a few of our Crustaceans, like several 

 species of birds and fish, &c., are to some extent migratory; and 

 perhaps to no portion does the term apply so much as to those 

 now under consideration. Although they may not exactly observe 

 the same regularity and order as some other of our migrants do, 

 fitill I am certain that they do make periodical, or in some cases 



