204 



CAEL BOVALLIUS, AMPHTPODA HYPERIIDEA. I. 2. 



HYPERIID^E. 



12. HYPERIA DYSSCHISTUS, TH, STEBBING, 1888. 



Diagn. Caput curtum, altum, dimidium segmentorum coalitorum persei longitudine superans. Segmen- 

 tuin primuni, sextum ac septimum perwi libera, segmentum secundum, tertium, quartum ac 

 quintum coalita. Carpus pedum perwi prirrii paris dilatatus et paullo productus, processum 

 formans tertiam partem longitudinis marginis posterioris metacarpi haud asquantem. Carpus 

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

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

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

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

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

 gulam gerentes; dactylus lorjgus. 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. Tehon 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. 



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

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

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

 duced, forming a process which scarcely is as long as the 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 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 

 ou 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 serrated; 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 lanceolate, 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: off 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 first pe- 



The author of the species, 



raeonal segment being free and the four following coalesced 



