190 



CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 



HYPERI1D.E. 



Hyperia Normani. 



In order to show how impossible it is to accept Lestrigonus rubescens of Spence 

 Bate as the same species as L. rubescens of Dana, I give here below some of the cha- 

 racteristics of the two animals. These characteristics are taken, partly from the descrip- 

 tions given by the two authors, and partly from the original drawings. 



Lestrigonus rubescens, Dana. 



The head is longer than the first five 

 pereeonal segments together. 



The first pereeonal segment is much 

 shorter than the second, and nearly concealed. 



The first two pairs of pereeopoda are 

 scarcely more than half as long as the third 

 and fourth pairs. 



The femur of the third and fourth 

 pairs is very narrow, linear. 



The last three pairs are nearly twice 

 as long as the two preceding pairs; the 

 femur is three or four times broader than 

 that of those pairs; the lower hind corner 

 of the femur of all these three pairs is 

 rectangular and acute. 



The dactylus of the last three pairs is 

 half as long as the metacarpus. 



The pleon is much longer than the head 

 and person together. 



The lateral parts of the pleonal seg- 

 ments are angulated behind. 



The first pair of uropoda are longer 

 than the second, and reach to the apex of 

 the last pair. 



Lestrigonus rubescens, Spence Bate. 



The head is shorter than the first two 

 pera?onal segments together. 



The first peraonal segment is fully as 

 long as the second. 



The first two pairs of perceopoda are 

 nearly as long as the third and fourth pairs. 



The femur of the third and fourth 

 pairs is laminar and broadly ovate. 



The last three pairs are only a little 

 longer than the tAvo preceding pairs; the 

 femur is not broader than that of those 

 pairs; the lower hind corner of the femur 

 of the fifth and sixth pairs is rounded; 

 that of the femur of the seventh is rectan- 

 gular and subacute. 



The dactylus of the last three pairs 

 is scarcely as long as fourth part of the 

 metacarpus. 



The pleon is shorter than the head and 

 person together. 



The lateral parts of the first and third 

 pleonal segments are rounded behind, that 

 of the second is angulated. 



The first pair of uropoda are shorter 

 than the second and do not reach to the 

 apex of the last pair, but the second pair 

 reach nearly to that apex. 



In my opinion Lestrigonus rubescens, Dana, is a Parathemisto, and as the animal 

 to which Spence Bate has applied Dana's name is widely different I have proposed 

 a new name for the animal which was the type for Spence Bate's description and 



drawing. 



Here follows the original description of Spence Bate: 



»Cephalon transversely ovate, flattened in front. Antennas subequal: superior pair nearly 

 as long as the animal, having the peduncle but half the length of the cephalon; first articulus 



