B. 



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



The two species are easily distinguished from one another: 



333 



The head is fully as long as the first three pergonal segments together. The 

 fifth pair of perasopoda are scarcely longer than the fourth; the femur is not 

 longer than the carpus. The rami of the uropoda are narrowly ovate 1. D. californica. 



The head is much shorter than the first three pergonal segments together. The 

 fifth pair of peraeopoda are considerably longer than the fourth; the femur is 

 longer than the carpus. The rami of the last pair of uropoda are broadly ovate 2. D. latissiuia. 



1. DAIRELLA CALIFORNICA, C. BOVALLIUS, 1885. 



PL XV, fig. 21—33. 



Diagll. Caput segmenta tria prima perasi longitudine asquans. Segmenta duo priora per ad coalita, 

 cetera libera. Pedes perm quinti paris pedibus quarti paris haud longiores, ac quam peraeon 

 multo breviores; femur carpo multo longius. Femur pedum parium trium ultimorum an- 

 gustum, plus quam quinquies longius quam latins. Pedes uri primi paris apicem pedum 

 ultimi j>aris superantes: rami pedum ultimi paris anguste ovati. 



The head is as long as the first three pergonal segments together. The first two pergonal 

 segments are coalesced, the following are free. The fifth pair of peraeopoda are not longer 

 than the fourth, and are shorter than the perason; the femur is much longer than the 

 carpus. The femur of the last three pairs is narrow, more than five times as long as 

 broad. The first pair of uropoda reach beyond the apex of the last pair; the rami of the 

 last pair are narrowly ovate. 



Colour. Whitish red, with numerous spots of dark red. 



Length. 9 mm. 



Hab. The Northern temperate and tropical regions of the Pacific, off the West coast of 

 California. (S. M.). 



Syil. 1885. Paraphronima californica, C. BOVALLIUS. 



Dairella 



»On some forgotten genera among 

 the Amphipodous Crustacean. Bib. 

 t. K. Vet. Ak. Handl. Bd. 10. 

 N:o 14, p. 11. 

 1887. "Systematical list of the Amphipoda 

 Hyperiidea». Bih. t. K. Sv. Vet. 

 Ak. Handl. Bd. 11. N:o 16, 

 p. 24. 



Dairella californica is at once distinguished from D. latissima by the large, in- 

 flated head, the shortness of the fifth pair of peraeopoda, and by the narrow femur in the 

 last three pairs. 



Hitherto I know' only the female form. 



