400 



CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. 



ANCHYLOMERID^E. 



Euprimno. 



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

 stinct with the growth of the animals. 



The uropoda are very narrow' in the smaller and younger specimens 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 

 macro pus, Guerin Meneville. 



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

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

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



1. EUPRIMNO MACROPUS 1 , F. E. GUERIN MENEVILLE, 1836. 



PI. XVII, fig. 23—40, PI. XVIII, fig. 1—2. 



Diagn. Caput segmenta tria prima perse i longitudine squans, altius quam longius. Segmentum 

 ultiinum percei ac segmenta duo priora plei in tergo acute producta. Femur pedum 

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

 quam person multo longiores; carpus ante fortiter dentatus, femur longitudine fere squans. 

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

 attingentes. 



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

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

 pointed processes directed backwards. The femur of the first pair of perwopoda is narrow, 

 that of the second dilated. The fifth pair are much longer than the whole person; 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 metallic 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. Primno macropa, P. E. GUERIN MENEVILLE. 



"Description de quelques gen- 

 res nouveaux des Crustaces 

 appartenant a la famille 

 des Hyperines». Magasin 

 de Zoologie. 6 me Annee. 



') Macropus is the right spelling instead of macropa, as the word is composed of /.laxQog and novQ. 



