400 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. ANCHYLOMERIDiE. 



Euprwirto. 



cimens of 1,5 inra. or 2 mm. in length, but this armature becoraes more and niore di- 

 stinct ^vith the growth of the animals. 



The uropoda are very narrow in the smaller and younger sp(;cimens but increase 

 gradually in breadth with the age of the animals, and the serration becomes gradually 

 more indistinct. 



Thus I feel justified to place the last three species as synonyms for Euprimno 

 macrop US, Guérin Méneville. 



The sexual difference in the genus is small and consists in the female being destitute 

 of the second pair of antennas and of mandibular palp, and further in the female having 

 only a single-jointed flagellum in the first pair of antennte. 



1. EUPRIMNO MACROPUS', F. E. GUÉRIN MÉNEVILLE, 1836. 



Pl. XVII, %. 2.3—40, Pl. XVIII, fig-. lr-2. 



Diagli. Caput segmenta tria prima peraei longitudine aequans, altius quam longius. Segmentum 

 ultimum pertei ac segmenta duo priora plei in tergo acute producta. Feniur pedum 

 percei primi paris augustvim, femur pedum secundi paris dilatatum. Pedes quinti paris 

 quam perEeon multo longiores; carpus ante fortiter dentatus, femur lougitudine fere asquans. 

 Latera segmentorum plei post acuta. Pedes uri primi paris apicem pedum tertii paris non 

 attingentes. 



The head is as long as the first three perteonal segments together, and is deeper than long. 

 The last perasonal segment and the first two pleonal are dorsally produced into sharp- 

 pointed processes directed backwards. The femur of the first pair oi pe7'ceop)oda is narrow, 

 that of the second dilated. The fifth pair are much longer than the vvhole perason; the 

 carpus is strongly denticulated on the front margin, and is nearly as long as the femur. 

 The lateral parts of the pleonal segments are sharp-pointed behind. The first pair of 

 uropoda do not reach to the apex of the third pair. 



Colour. Whitish red, with metaliic lustre on the pleonal segments. 



Length. 5—12 mm. 



Hab. The subtropical and tropical regions of the Atlantic and of the Pacific; the Indian 

 Ocean; the Australian Antarctic region. (D, M.; F. M.; K. M.; P. M.; S. M.; 

 U. M.) 



Syn. 1836. Prajmomntw^JajP.E. GUÉRIN MÉNEVILLE. — .,Descriptioii de quelques gen- 



res nouveaux des Crustaoés 

 appartenaut å la famille 

 des Hypérines». Magasin 

 de Zoologie. 6°"^ Année. 



') Macropus is the right spelling instead of macropa, as the word is composod of f.iaxQng and ttovq. 



