202 CARL BOVALLIUS, AMPHlPODA HYPERIIDEA. I. 2. HYPERIIDjE. 



Hyperia sibaginis. 



The head is short, as long as the first two personal segments together. All the segments 

 of the prra'on are free, the first is very long. The carpus of the first pair of perceopoda 

 is a little dilated and produced, forming a process which is shorter than a third part of 

 the hind margin of the metacarpus. The carpus of the second pair is a little dilated and 

 produced; the front margin of the carpal process is somewhat shorter than half the hind 

 margin of the metacarpus. The metacarpus of the first, and second pairs has two bristles 

 fixed on the front margin; the hind margin is serrated, with simple teeth; the dactylus is 

 long. The third and fourth pairs are longer than the first and second; the carpus and 

 metacarpus are serrated; the carpus is also provided with a single bi'istle; the dactylus is 

 very long. The last three pairs are longer than the two preceding; the tibia, carpus, and 

 metacarpus are serrated. The carpus of the fifth and sixth pairs is longer than the tibia. 

 The lateral parts of the pleonal segments are angular behind. The peduncle of the last 

 pair of uropoda is broad, but twice as long as broad. The telson is rounded, broader 

 than long, and much shorter than the last ural segment; it is as broad as the peduncle of 

 the last pair of uropoda and not nearly half as long. 



Colour. Whitish with a few red spots on the epimerals and femora of the peraeopoda. 



Length. 6 — 7 mm. »Less than a fifth of an inch.» (Stebbing.) 



Hab. The tropical region of the Pacific: »off Sibago, Philippines; Lat. 6° 47' N., Long. 122° 

 28' E.; daytime, 80 fathoms.» (Ch. E. stat. 200. Stebbing.) China Sea: Lat. 9° 50' N., 

 Long. 118° 20' E. (S. M.) 



Syn. 1888. Hyperia sibaginis, TH. STEBBING. »Report on the Amphipoda». Voy. of H. 



M. S. Chcillenger. Zoology. Vol. 29, 

 p. 1379, pi. 165. 



Hyperia sibaginis is easily distinguished from all its congeners by the unusual 

 length of the first pergonal segment. In the form of the legs it comes near to the next 

 species H. dysschistu*. As the drawings published by Stebbing are very good and com- 

 plete I do not give any new ones here, but I supplement his description with a few re- 

 marks which are of some importance for the distinction of the species. These charact- 

 eristics are taken from male specimens only as I have not examined any females of the 

 species. 



The male. 



The body is tolerably stout, but not very broad; the head and peraeon together are 

 shorter than the pleon and urus together. 



The head is quite as long as the first two pera3onal segments together; the an- 

 tennal groove is very large and commences immediately below the upper front corner of 

 the head. 



The first pair of antenna? are much shorter than the second, and do not reach to 

 the hind margin of the second pleonal segment. 



The second pair of antenna? reach fully to the apex of the telson. 



