KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 225 



18. HYPER1A CRUCIPES, n. s P . 



PL XI, fig. 14—25. 

 The name is chosen with regard to the peculiar form of the dactylus of the fifth and sixth pairs of perreopoda. 



Diagn. Caput permagnum, infra late productum, segmenta tria prima peraei longitudine requans. 

 Segmenta tria prima percei coalita, cetera libera. Carpus pedum perm primi paris valde 

 dilatatus ac productus; margo anterior processus carpalis dimidio marginis posterioris 

 metacarpi longior. Carpus pedum secundi paris valde productus; margo anterior pro- 

 cessus carpalis marginem posteriorem metacarpi longitudine fere asquans. Metacarpus 

 pedum primi et secundi parium spinis carens; margo posterior serratus, dentibus simpli- 

 cibus, spinulis perpaucis intermixes; dactylus longus. Pedes tertii ac quarti pai-ium pe- 

 dibus parium duorum pracedentium longiores; carpus tumidus, spinis ternis, margini po- 

 steriori affixis, instructus; metacarpus carpo multo angustior, non serratus. Pedes parium 

 trium ultimorum duobus pnecedentibus non longiores; carpus metacarpusque non serrati; 

 dactylus pedum quinti ac sexti parium crucifer. Latera segmentorum plei post rotundata. 

 Pedunculus pedum uri ultimi paris latus. Telson longius quam latius, segmento ultimo uri 

 paullo brevius, pedunculo pedum uri ultimi paris latius, ac dimidio pedunculi ejusdem 

 longius. 



The head is very large, broadly produced downwards, and is as long as the first three co- 

 alesced pergonal segments. The first three segments of the person are coalesced, the four 

 following are free. The carpus of the first pair of perceopoda is much dilated and pro- 

 duced; the front side of the carpal process is more than half as long as the hind margin 

 of the metacarpus. The carpus of the second pair is much produced; the front side of 

 the carpal process is nearly as long as the whole hind margin of the metacarpus. The 

 metacarpus of the first and second pairs wants bristles; the hind margin is serrated, with 

 simple teeth and between them a few short spines. The third and fourth pairs are longer 

 than the first and second pairs; the carpus is tumid, and provided with three bristles on 

 the hind margin; the metacarpus is much narrower than the carpus, not serrated. The 

 last, three pairs are not longer than the two preceding; the carpus is longer than the 

 tibia; the carpus and metacarpus are not serrated; the dactylus of the fifth and sixth pairs 

 is armed with cross-shaped projections at the base. The lateral parts of the pleonal seg- 

 ments are rounded behind. The peduncle of the last pair of uropoda is broad, twice as 

 lono- as broad. The telson is longer than broad, and a little shorter than the last ural 

 segment; it is as broad, and more than half as long, as the peduncle of the last pair of 

 uropoda. 



Colour. Red, with small dark spots on the lower parts of the body. 



Length. 4 mm. 



Hab. The tropical region of the Atlantic: Off Bar bad oes (F. M.; S. M.). 



29 



K. Sv. Vet. Akad. Handl. Band. 22. N:o 7. 



