388 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. PHRONIMIDiE. 



In 1885 Carus translated in Latin the diagnosis given by Claus in 1879. 

 In 1886 Gekstaecker gave the following diagnosis: 



»Kopf lang ausgezogen, mit hoch gewolbtem Scheitel. Kiefertaster beiden Geschk'chtern 

 fehlend. Die beiden ersten Mittelleibsringe lest mit einander verschmolzen, ihre Beinpaare diinn, 

 mit schwacher Greifhand; viertes Beinpaar stark verlangert, das funfte in eine langstreckige 

 Greifhand endigend. Kiemenschlauche wie bei Phronima. Von den grift'elformigen Hinterleibs- 

 beinen nur zwei Paare ausgebildet.» 



In 1887 I deseribed a new species Phronimella filiformis, which, however, according 

 to further examination, is only a variety of Ph. elongata. 



In the same year Giles proposed the new specific name Phronimella hippocephala, 

 which is also a synonym for Ph. elongata. 



In 1888 Stkbbing gave elaborate descriptions of different forms of Phronimella 

 elongata taken during the »Challenger»-expedition. 



The sexual differences are greater than in the genus Phronima. being the 

 following: 



1. The body and the legs are more robust in the male than in the female. 



2. The flagellum of the first pair of antennae is multi-articulate in the male, but consists 

 of a single joint in the female. 



3. The second pair of antennae are filiform and multi-articulate in the male, but want- 

 ing in the female. 



4. All the pairs of peraeopoda, and especially the third pair, arc more elongated in the 

 female than in the male. 



5. The carpus of the fifth pair is more elongated in the female than in the male, being 

 five or six times as long as broad, while in the male it is only about three times 

 as long as broad. The second pair of uropoda are more or less developed in the 

 male, but wanting in the female. 



Most of the specimens of Phronimella have been captured swimming free in the 

 surface of the sea, but a few female specimens have been found inhabitating very thin 

 and hyaline »houses», probably the remains of some Siphonophora. 



The single species is thus Phronimella elongata, Claus. 



