KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 22. N:0 7, 



147 



1. HYPERIA MEDUSARUM, O. F. MULLER, 1776. 



Pl. IX, fig. 1—21. 



'f|[^]j[;;3nJ>iJu*ttimio»»'»'VjlnP3»» 



Piilex cancriformis, antennis brevissimis, 

 H. Str0M. 



Facsimile from .Str0m, S0ndm0r, pl. 1, fig. 12 and 13. 



Talitrus cyanea, Sabine. 



Facsimile from Sabine, Crust. of Supp. to Appcnd. of Parry's 

 voyage, pl. 1, fig. 12 — 18. 



Pig. 1. The male. 2. The female. 3. The head of the 

 same. 4. The first pair of autenua; of au adult male. 

 5. The same pair of a youuger male. 6. The second 

 pair of perseopoda. 7. The urus. 



Diagn. Caput curtum, latum, segmenta duo priora peraäi longitudine a3quans. Segmenta omDiajjevtCT 

 libera. Carpus jjeduin perwi primi paris dilatatus, non productus, spinis longissimis in- 

 dutus, margo posterior leviter incisus. Carpus pedum seeundi paris paullo productus, 

 spinis longissimis indutus. Metacarpus pedum primi et seeundi parium ovatus, spinis 

 longissimis indutus, margo posterior incisus, non serratus; dactylus parvus, spinis obtectus. 

 Pedes tertii ac quarti parium pedibus parium duorum prfecedentium paullulo longiores, 

 spinis longis liberaliter iustructi. Pedes parium trium ultimorum duobus priecedentibus 

 non longiores; femur angustum, carpus metacarpusque leves, non serrati. Latera segmen- 

 torum plei duorum ultimorum angulata. Pedunculus pedum uri ultimi paris latissimus. 

 Telson non longius quam latius, segmentum ultimum uri longitudine jequans, pedunculo 

 pedum uri ultimi paris non angustius, ac dimidio pedunculi ejusdem longius. 



The head is short and broad, as long as the first two perfeonal segments together. All the 

 percBonal segments are free. The carpus of the first pair of perwopoda is dilated, not 

 produced, covered with very long bristles; the hind margin is feebly notched. The 

 carpus of the second pair is a little produced, covered with very long bristles. The meta- 

 carpus of the first and second pairs is egg-shaped, covered with very long bristles, the 

 hind margin is notched, not serrated; the dactylus is small, hidden by bristles. The third 

 and fourth pairs are only a little longer than the two preceding pairs, thickly set with 

 long bristles. The last three pairs are not longer than the two preceding pairs; the 

 femur is narrow, the carpus and metacarpus are smooth, not serrated. The lateral parts 

 of the last two pleonal segments are angulated. The peduncle of the last pair of Mroporfa 

 is very broad. The telson is not longer than broad, equalling in length the last ural 

 segment; it is not narrower than the peduncle of the last pair of uropoda, and more than 

 half as long as the same peduncle. 



