204 



CAKL BUVALLIUS, AMPHIPOUA HYPERIIDEA. I. 2. 



HYTERIID^. 



12. HYPERIA DYSSCHISTUS, TH. STEBBING, 1888. 



Diagn. Caput curtum, altuni, dimidium segmentorum coalitorum peraei longitudine superans. Segmen- 

 tum priuium, sextum ac septimum perwi libera, segmentum secundum, tertiiiin, quartum ac 

 quintum coalita. Carpus pediim perwi primi paris dilatatus et paullo prodiictus, processum 

 formans tertiam partem longitudinis marginis posterioris metacarpi haud a3quantem. Carpus 

 pedum secundi paris paullo dilatatus et productus; margo anterior processus carpalis di- 

 midio marginis posterioris metacarpi paullo longior. Metacarpus pedum primi et secundi 

 parium, spiuam siugulam margini anteriori affixam gerens; margo posterior serratus, den- 

 tibus simplicibus; dactylus longus. Pedes tertii ac quarti parium pedibus parium duorum 

 pnecedentium paullo longiores; carpus metacarpusque serrati; tibia carpusque spinam sin- 

 gulani gerentes; dactylus longus. Pedes parium trium ultimorum duobus prsecedentibus 

 multo longiores; carpus metacarpusque pectinati vel minute serrati; carpus pedum quinti ac 

 sexti parium tibia non brevior. Latera segmentorum plei post obtuse angulata. Pedunculus 

 pedum uri ultimi paris angustus, plus quam ter longior quam latior. Telson late lanceo- 

 latum, longius quam latius; segmento ultimo uri paullulo brevius, pedunculo pedum uri 

 ultimi paris duplo fere latius ac dimidio pedunculi ejusdem paullulo longius. 



Tiie head is short, deep, and more than half as long as the coalesced portion of the perason. 

 The first, sixth, and seventh perwonal segments are free, the second, third, fourth, and 

 fifth are coalesced. The carpus of the^first pair of perceopoda is dilated and a little pro- 

 duced, fVirming a process vvhich scarcely is as long as the third ])art 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 a little more than half as long as the hind margin of 

 the metacarpus. The metacarpus of the first and second pairs has one single bristle fixed 

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

 The third and fourth pairs are a little longer than the first and second; the carpus and 

 metacarpus are serrated; the tibia and carpus are provided each with a single bristle; the 

 dactylus is long. The last three pairs are much longer than the two preceding; the carpus 

 and metacarpus are pectinated or minutely seri-ated; the carpus of the fifth and sixth pairs 

 is not shorter than the tibia. The lateral parts of the pleonal segments are obtusely an- 

 gular behind. The peduncle of the last pair of uropoda is narrow, and more than three 

 times as long as broad. The telson is broadly Janceolate, as long as broad, and only a 

 little shorter than the last ural segment; it is about twice as broad, and a little more than 

 half as long, as the peduncle of the last pair of uropoda. 



ColOUr. Light red. 



Length. 3—5 mm. 



Hab. The Southern temperate region of the Pacific: ofl" Auckland, New Zealand; »off 

 Cape Howe, Australia, Lat. 37° 33' S., Long. 149° 54'; surface, night». (StebbinG.) 

 (Ch, E.; S. M.; U. M.) 



Hyperia dysschistus is a very remarkable species owing to the iirst pe- 

 rasonal segment being free and the four folloAving coalesced. The author of the species, 



