150 CARL BOVALLIUS, AMPH]PODA HYPERIIDEA. I. 2. HYPERIID^. 



Hyperia medusarum. 



A. de Lamarck. 2™^ éd. 

 Torne 5'°^ p. 304. 

 Hyperia Cymiece, E. SABINE. H. Milne Edwakds. 1839. » S"'' éd. Torne 2''>^ p. 369. 



2'alitrus •> » » 1840. Histoire naturelie des Crustacés. 



Torne 3°"=, p. 78. 

 Metoecus « » A. White. 1847 . List of the Specimens of Cru- 



stacea in the Collection of 



the British Museum, p. 91. 



1861. Hyperia spinipes, A. BOECK. — »Bemserkninger angaaende de 



ved de norske Kyster forekom- 

 mende Araphipoder». For- 

 handl. ved de Skandinaviske 

 Naturforskeres 8'^'= M0de, i 

 Kjobenhavn, 1860, p. 636. 



» » » A. BoECK. 1870. »Crustacea amphipoda borealia 



et arctica». Christiania Viden- 

 skabs-Selskabs Forhandl. for 

 1870, p. 86 (6). 



» » » » 1872. De Skandinaviske og Arktiske 



Araphipoder, p. 81. 



» » 1) G. O. Saus. 1882. »Oversigt af Norges Crustacéer 



med forel0bige Bemserknin- 

 ger över de nye eller mindre 

 bekjeudte Arter». Christiania 

 Videnskabs-Selskabs Por- 

 handl. forl882, N:ol8, p. 19. 



Here follows a translation of the original descriptiori given in 1762 by Hans Ste0m, 

 which is also the earliest known description of a Hyperid: 



»Under the large yellowfishes, known as Medusce orbieuli margine sedecies eniarginato, you 

 will sometimes find a little insect, which is very similar to the »Marflue»^) and which I shall call 

 Pidex cancriformis antennis brevissimis, corpore latiore (because I hardlj' think it has been described 

 before). Its body is not so thin and compressed as that of the »Marflue», but it is broad and 

 rounded above. The head, which is very truncated, has two oblong eyes, almost like crescents, 

 and between these two pairs of antennas, the upper pair turning upwards, the lower pair down- 

 wai"ds. The anterior, broader part of the body consists of seven narrow joints or annuli, the 

 hind, narrow part of the body consists of three broader annuli; thereafter follows the tail which 

 (beside a pair of small scales on the upper side) has at the distal end first two thin lancet-like 

 laminse, cleft at the apex and then a similar pair on each side, though these are to be seen only 

 when the tail is expanded. The legs are many and of three kinds: the first two pairs are hir- 

 sute or fluffy, truncated at the apex, and they consist of four joints; the five following pairs are 

 less thick and hirsute, but they are provided with five joints, the last of which is a sharp-pointed 

 claw; the last three pairs, which are concealed by the tail, have only two joints, the last of which 

 is cleft into two parts, which are fringed with hairs and like feathers. The insect swims either 

 on the back or on the side, contracting itself during its progress just like the »Marflue», but it 

 then uses only the last three pairs of legs, which are fixed under the tail, the other legs being 

 at rest. When it stånds still the first two pairs and the last three pairs are concealed, and only 

 the five intermediate pairs are stretched out, as is shown on Plate 1, fig. 12 and 13.^) The colour 

 is reddish, especially on the dorsal side; but the eyes are either blue or green, and very large.» 



') Gammarus. 



') See above, p. 147. 



