KONGL. SV. VET. AKADEMIENS HANDLINGAl!. BAND. 22. N:0 7. 331 



In 1877 Streets described a iiew genus Anchylonya:, whicli lie liitnself in 1882 

 coiisidercd to be a synonym for Pkronimella; lie also pointed out tlie faniilycharaeteristies 

 of Phronimidaj. 



In 1886 Gerstaecker recorded the faniily Phronimidoi with thc two subfiimilies 

 1. Plivosininai, comprising the genera Anchylomera, Phrosina, and Primno, and 2. Pliro- 

 niiiiinw with the genera Phronima, Plironimella, Phronimopsis and Paraphronima. 



In 1887 I removed Pltrosinince from the family Phronimida; instituting for their 

 reception a new family Änchylomeridce; the Phronimidse I gave with two subfamilics, 

 1. Dairellintc, based upon the new genus Dairella, and 2. Phroniminai Avith two 

 genera Phronima and Plironimella. 



In 1888 Stebbing recorded the Phronimida?, describing new speeies of Dairella, 

 Phronima, and Pkronimella; with regard to the Plirosininw as a family by itself he ac- 

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



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

 the building of the eyes, the building of the iirst pair of antennas and the absence of 

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

 with the perasonal segments, and in the form of the seventh pair of peraiopoda. 



A. The head is iwegularly globular. All the pera^opoda are simple, walking legs 1. Dairellinx. 



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



form; the fiftli pair form a subcheliform, or a folding hand 3. Phroniniiiiie. 



The tirst subfamily DAIRELLINJl, C. BOVALLIUS, 1887. 



Diagn. Caput permagmim, tumidum, inaaquabiliter globosum. Epimera indicata sed non a segraentis 

 perfei sejuncta. Pedes joerwi omnes simplices, ambulatorii. 



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

 separated from the perajonal segments. All the peraopoda are simple, walking legs. 



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

 make it desirable to place the Dairellina; 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 Dairellinse as a 

 subfamily of P h r o n i m i d a?. 



Hitherto only a single genus Dairella is known. 



