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



159 



pair consist of only two joints without claw or dactylus, and are scarcely longer than 

 the first joint of the sixth pair. 



The pleopoda consist of small sack-like prominences on the under side of the three 

 pleonal segments. 



The urus consists of three segments, each with a pair of small sack-like appendages 

 without any trace of rami. 



2. HYPERIA HYSTRIX, n. s P . 



PI. IX, fig. 22—30. 



Diagn. Caput curtum, latum, segmentis duobus primis persei brevius. Segmenta omnia perm libera. 

 Carpus pedum percei primi paris dilatatus, paullo productus, spinis brevibus iudutus. Carpus 

 pedum secundi paris productus, margo anterior processus carpalis dimidio marginis poste- 

 rioris metacarpi paullo brevius; margo posterior rectus. Metacarpus pedum primi et se- 

 cundi parium fere conicus, spinis brevibus indutus, margo posterior incisus, non serratus; 

 dactylus longus e spinis exstans. Pedes tertii ac quarti parium pedibus parium duoruin 

 prrecedentium paullo longiores, spinis brevibus instructi. Pedes parium trium ultimorum 

 duobus prascedentibus non longiores; femur paullo dilatatum; carpus metacarpusque in- 

 distincte serrati. Latera segmentorum plei infra rotundata, post angulata. Pedunculus 

 pedum uri ultimi paris latus. Telson non longius quam latius, dimidio segmenti ultimi uri 

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



The head is short and broad, shorter than the first two pergonal segments together. All 

 the pera'onal segments are free. The carpus of the first pair of perceopoda is dilated, a 

 little produced, covered with short bristles. The carpus of the second pair is produced, 

 covered with short bristles; the front margin of the carpal process is a little shorter than 

 half the hind margin of the metacarpus; the hind margin of the carpus is straight. The 

 metacarpus of the first and second pairs is slightly conical, covered with short bristles; the 

 hind margin is notched but not serrated; the dactylus is long, protruding from the bristles. 

 The third and fourth pairs are a little longer than the two preceding pairs, provided with 

 short bristles. The last three pairs are not longer than the two pi*eceding pairs; the 

 femur is a little dilated; the carpus and metacarpus are indistinctly serrated. The lateral 

 parts of the pleonal segments are l'ouuded below, and angulated behind. The peduncle of 

 the last pair of uropoda is broad. The telson is as long as broad, longer than half the 

 last ural segment; it is narrower than the peduncle of the last pair of uropoda, and 

 shorter than half the same peduncle. 



Colour. Yellowish red. 



Length. 13 — 16 mm. 



Hab. The Sea of Japan: Lat. 39° N., Long. 133° E.; taken by the Danish Captain Andkea, 

 in 1869. The Northern temperate region of the Pacific: Lat. 46° N., Long. 165° E. 

 (Wessel). (D. M.; S. M.) 



