274 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERI1DJE. 



Parathemisto rubescens. 



Colour. »A little r-eddish in some parts. Coxa? of six posterior legs reddish» (Dana). 



Length. »One-eighth of an inch», (Dana.) 



Hab. The Pacific, Lat. 18° S., Long. 124 W. (Dana.) 



Syn. 1852. Lestrigonus rubescens, J. D. DANA. United States Exploring Expedition. 



Crustacea. Vol. 2, p. 984, pi. 67, 

 fig. 9. 

 Hyperia rubescens, » C. Bovallius. 1887. "Systematical list of the Ampbipoda 



Hyperiidea». Bih. t. K. Sv. Vet. Ak. 

 Handl. Bd. 11. N:o 16, p. 16. 



As I have said above it is not quite certain that the present species is a true Para- 

 themisto, nothing being known about the shape of the first two pairs of perreopoda nor of 

 the carpus in the third and fourth pairs. On the other hand nothing in the short description 

 goes against the supposition that it is a Parathemisto, so it is provisionally placed 

 here to awaite the rediscovery of the species and its further investigation. From the 

 other species of the genus it is distinguished by the unusually short peraeon, which has 

 the dorsal part of the first segment almost concealed, by the carpus of the fourth pair 

 of peraBopoda being armed with only two bristles, by the fifth and sixth ural segments 

 not being coalesced, and by the outer ramus of all the three pairs of uropoda being quite 

 as long as the inner, if this last characteristic, derived from the examination of the draw- 

 ing, is to be relied upon. 



I reproduce here Dana's description: 



»Thorax a little longer than in the preceding, 1 ) first segment nearly concealed. Head 

 flattened in front. Seventh abdominal segment separated by a suture from the sixth, sparingly 

 narrower. Antennas four, very nearly equal, a little longer than the body, base of the superior 

 antennas not acute at lower apex, flagellum about 14-jointed, first joint short, the others oblong. 

 Coxa of six posterior feet nearly rectangular and acute at posterior apex, and fourth joint bear- 

 ing a seta (these feet elsewhere naked); claw half as long as tarsus. — — — First joint of 

 flagellum of superior antenna? not longer than last of base, other joints of flagellum slender, cy- 

 lindrical. Last (seventh) abdominal segment triangular, obtuse. Two setae on inferior side of 

 fourth joint of fourth pair of legs. Fifth, sixth, and seventh pairs of legs very nearly equal. » 



l ) Lestrigonus fuscus == Themistella fusca. 



