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



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

 In 1886 Gehstaeckeb gave the following diagnosis: 



»Kopf laug iiusgezogen, mit hocli gewölbteni Scheitel. Kiefertaster beiden Geschlcclitern 

 fehlend. Die beiden eisten Mittelleibsringe fest mit einander verschmolzeu, ihre Beinpaare diinn, 

 mit sciiwacher Greifhand; viertes Beinpaar stark verlängert, das fiinfte in eine langstreciiige 

 Greifhand endigend. Kiemenschläuche wie bei Plironinia. Von den griffelförmigen Hinterleibs- 

 beinen nur zwei Paare aiisgebildet.» 



In 1887 I described a new speeies Plironimella Jiliformis, which, however, according 

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



In the same year GiLES proposed the new specific name Plironimella liippocephala, 

 which is also a synonym for Ph. elongata. 



In 1888 Stebbing gave elaborate descriptions of different forms of Phronimella 

 elongata taken dui'ing the »Challengerw-expedition. 



The sexual diffei-ences are greater than in the genus Phronima, being the 

 following: 



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



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

 of a single joint in the female. 



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

 ing in the female. 



4. All the pairs of pera?opoda, and especially the third pair, are 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 Sijjhonophora. 



The single speeies is thus Phronimella elongata, Claus. 



