202 CARL BOVALLIITS, AMPHIPODA ttYPKRtinEA. 1. ^. HYPERIID^. 



nyperia sibaginis. 



The liead is short, as long as the first two perfeonal segments together. All the segments 

 of the perccon are free, the first is very long. The carpiis of the first pair of perwopoda 

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

 the hind margin of the mefacarpus. 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 mai"gin; the hind margin is serrated, with simple teetli; 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 singlc bristle; tiie dactylus is 

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

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

 The lateral parts of the pleonal segments ai"e angular beiiind. 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. AVhitisli with a few red spöts on tho epimerals and femora of the pernsopoda. 



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



H.ab. Tiic tropical region of tlie Pacific: »off Sibago, Piiilippines; Lat. 6° 47' N., Long. 122° 

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

 Long. 118° 20' E. (S. M.) 



Syn. 1888. IJyperia sihaghiis, TH. STEBBING. — »Report on the Ampliipoda». Voy. of H. 



M. S. Challeuger. Zoology. Vol. 29, 

 p. 1.379, pl. 165. 



Hyperia sibaginis is easily flistingiiished from all its congeners by the umisual 

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

 species H. dysschistuf. As the drawings piiblished by Stebbing are very good and com- 

 plete I do not giA^e 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 froin iiiale specimens only as I have not examined any feraales of the 

 species. 



T h e m a 1 e. 



The body is tolerably stoiit, but not very broad; the head and perteon together are 

 shorter than the pleon and urus together. 



The head is quite as long as the first two pera?onal segments together; the an- 

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

 the head. 



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

 the hind margin of the second pleonal segment. 



The second pair of antennce reach fully to the apex of the telson. 



