KONGL. SV. VET. AKADEM1ENS HANDLINGAR. BAND. 22. N:0 7. 331 



In 1877 Streets described a new genus Anchylonyx, which he himself in 1882 

 considered to be a synonym for Phronimella ; he also pointed out the family characteristics 

 of Phronimidae. 



In 1886 Gerstaecker recorded the family Phronimidae with the two subfamilies 

 1. Plirosininm, comprising the genera Anchylomera, Phrosina, and Prirnno, and 2. Phro- 

 nimince with the genera Phr omnia, Phronimella, Phronintojjsis and Paraphronima. 



In 1887 I removed Phrosinince from the family Phronimidae instituting for their 

 reception a new family Anchylomeridce ; the Phronimidae I gave with two subfamilies, 

 1. Dairellinae, based upon the new genus Dairella, and 2. Phroniminae with two 

 genera Phronima and Phronimella. 



In 1888 Stebbing recorded the Phronimidae, describing new species of Dairella, 

 Phronima, and Phronimella; with regard to the Phrosinince as a famity by itself he ac- 

 cepted my views but proposed the name Phrosinidce instead of Anchylomerid.ee (see below). 



The two subfamilies differ from one another in many characteristics, but agree in 

 the building of the eyes, the building of the first pair of antenna?, and the absence of 

 the second pair in the female, the form of the mouth-organs, the fusion of the epimerals 

 with the peraeonal segments, and in the form of the seventh pair of peraeopoda. 



A. The head is irregularly globular. All the pergeopoda are simple, walking legs 1. Dairellinie. 



B. The head is conical. The first two pairs of peraeopoda are more or less subcheli- 



form; the fifth pair form a subcheliform, or a folding hand 2. Phronimina:. 



The first subfamily DAIRELLIM], C. BOVALLIUS, 1887. 



Diagn. Caput permagnum, tumidum, inaequabiliter globosum. Epimera indicata sed non a segmentis 

 perasi sejuncta. Pedes perad omnes simplices, ambulatorii. 



The head is very large, tumid, and irregularly globular. The epimerals are marked but not 

 separated from the peraeonal segments. All the perwopoda are simple, walking legs. 



It is possible that further anatomical studies of Dairella and Phronima will 

 make it desirable to place the Dairellinae as an independent family, instead of a sub- 

 family at the side of the Phronimince, but at present I find it more convenient on ground 

 of the agreement in the above recorded characteristics, to retain the Dairellinae as a 

 subfamily of Phronimidae. 



Hitherto only a single genus Dairella is known. 



