222 CARL B0VALL1US, AMPHIPODA HYPERIIDEA. I. 2. HYPERIIDiE. 



Hyperia schizogeneios. 



uri ultimi paris quater longior quam latior, ramum internum tertia parte longitudine su- 

 perans. Telsou triangulatum, longius quam latius, segmentum ultimum uri longitudine 

 rcquans, pedunculo pedum uri ultimi paris duplo latius, ac dimidio pedunculi ejusdem 

 paullo longius. 



The head is very large, produced downwards into a sharp-pointed process, and as long as 

 the first five peraeonal segments together. The first three segments of the perceon are 

 coalesced, the four following are free. The carpus of the first pair of perceopoda is dilated 

 and produced; the front side of the carpal process is not fully half as long as the hind 

 margin of the metacai-pus. The carpus of the second pair is produced; the front side of 

 the carpal process is more than half as long as the hind margin of the metacarpus. The 

 metacarpus of the first and second pairs has a single bristle on the front margin; the 

 hind margin is serrated, with simple teeth; the dactylus is long. The third and fourth 

 pairs are a little longer than the two preceding; the carpus is not tumid, and has two bristles 

 on the hind margin; the metacarpus is only a little narrower than the carpus, and is 

 serrated. The last three pairs are not longer than the two preceding; the carpus is longer 

 than the tibia; the carpus and metacarpus are serrated; the dactylus is long and simple. 

 The lateral parts of the phonal segments are rounded behind. The peduncle of the last 

 pair of aropoda is four times as long as broad, and only a third part longer than the 

 inner ramus. The telsou is triangular, longer than broad, and as long as the last ural 

 segment; it is twice as broad, and more than half as long, as the peduncle of the last 

 pair of uropoda. 



Colour. Almost hyaline with small red spots. 



Length. 2 to 4 mm. 



Hab. The tropical region of the Atlantic: off Martinique; the Caribbean Sea. (F. M. ; S. M.) 

 »Off St. Vincent, Cape Verde Islands; Lat. 16° 49' N., Long. 25 " 14' W.» (Stebbing.) 



Syil. 1888. Hyperia schizogeneios, TH. STEBBING. 



"Report on the A'mphipoda». Voy. of 11. 

 M. S. Challenger. Zoology. Vol. 29, 

 p. 1391, pi. 168. 



Hyperia schizogeneios is easily distinguished from all the preceding species by 

 the lower portion of the head being produced downwards into a sharp process; from the 

 next species H. crucipes, which also has the lower portion of the head produced, it may 

 be distinguished by the shape of this process, and by the comparatively shorter carpal 

 process of the first and second pairs of perasopoda. It is also remarkable for the great 

 width of the forepart of the body, the peraeon in the female being considerably broader 

 than long. With this great dilatation of the person follows a considerable enlargement 

 of the head, which is comparatively much larger than in any of the preceding species. 



As the specimens I have collected in the West-Indies agree in all details with that 

 described and figured by Stebbing, I give no new drawings, and only a few notices derived 

 from the examination of an adult male. 



