KONGL. SV, VET. AKADEMIENS IIANDLINGAK, BANH. 22. N:() 7. 



229 



19. HYPEIMA LATISSIMA, n sp. 



Pl. XI, Hff. 26—36. 



Diagn. Caput permagnum, segmentis quattuor primis perasi brevius. Segmenta quattuor prima perw? 

 coalita, cetera libera. Carpus jjeduni pe7'ad primi paris dilatatus, paullulo productus. Car- 

 pus pedum secundi paris productus; margo antei'ior processus carpalis dimidium marginis 

 posterioris inetacarpi loDgitudine a3quans. Metacarpus pedum primi paris spinas duas lateri 

 exteriori affixas gerens; metacarpus pedum secundi paris spinam unam gerens; margo poste- 

 rior metacarpi serratus, dentibus simplicibus; dactylus loiigus. Pedes tertii ac quarti parium 

 pedibus parium duorum jDraicedentium multo longiores; carpus spinis binis instructus; meta- 

 carpus serratus; dactylus curtus. Pedes parium trium ultimorum duobus praacedentibus 

 paullo longiores; femur modice dilatatum; carpus pedum septimi paris tibia brevior; meta- 

 carpus serratus; dactylus longus. Latera segmentorum plei post rotundata. Pedunculus 

 pedum uri ultimi paris plus quam ter longior quam latior. Telson triangulatum, longius 

 quam latius, segmento ultimo uri paullo brevius, pedunculo pedum uri ultimi paris latius, 

 ac dimidio pedunculi ejusdem multo longius. 



The head is very large, but shorter than the first four peraional segments togetlier. The first 

 four perceonal segments are coalesced, the following are free. The carpus of the first pair 

 oi perceopoda is dilated, and a little produced. The carpus of the second pair is produced; 

 the front side of the carpal process is half as long as the hind margin of the metacarpus. 

 The metacarpus of the first pair has two bristles on the outer side, that of the second pair 

 has one; the hind margin of the joiut is serrated, with simple teeth; the dactylus is long. 

 The third and fourth pairs are much longer than the first and second; the carpus is pro- 

 vided with two short bristles; the dactylus is short. The last three pairs are a little longer 

 than the two preceding; the femur is moderately broad; the carpus of the seventh pair is 

 shorter than the tibia; the metacarpus is serrated; the dactylus is long. The lateral parts 

 of the pleonal segments are rounded behind. The peduncle of the last pair of uropoda 

 is more than three times as long as broad. The telson is triangulär, longer than broad, 

 and a little shorter than the last ural segment; it is broader than, and more than half as 

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



Colour. Light red. 



Length. 4 mm. 



Hab. The Southern temperate region of the Atlantic (S. M.; U. M.). 



In general form Hyperia latissima comes nearest to H. schizogeneios, but is at 

 once distinguished by the broadly rounded under margin of the head, and by the coalition 

 of the tirst four peraeonal segments. Stebbing, describing H. schizogeneios, mentions in- 

 cidentally (1. c. p. 1391) »the first three or sometimes four segments of the perteon dorsally 

 coalesced»; as I never found more than the first three segments coalesced in the many 

 specimens of H. schizogeneios that I have examined, and as I have specimens of H. la- 



