KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 353 



These seven species are to be distinguished as shows the following synoptical table: 



A. The lower front corner of the carpus of the fifth pair of peragopoda is pro- 

 duced downwards beyond the under margin of the joint. 

 a 1. The carpus of the fifth pair of peraaopoda is longer than broad. 



aa 1. The carpal process of the fifth pair of peraeopoda is more 

 than twii 

 the joint. 



than twice as long; as the tubercle on the under margin of 



aaa 1. The fifth pair of perasopoda are much longer than the 



fourth _ 1. Ph. sedentaria. 



aaa 2. The fifth pair of peragopoda are not longer than the 



fourth__ _._ _ _ 2. Ph. spinosa. 



aa 2. The carpal process of the fifth pair of perasopoda is not twice 

 as long as the tubercle on the under margin of the joint. 



aaa 3. The tubercle on the under margin of the carpus of the 



fifth pair of perreopoda is undivided 3. Ph. solitaria. 



aaa 4. The tubercle on the under margin of the carpus of the 



fifth pair of peraeopoda is two-pointed 4. Ph. atlantica. 



a 2. The carpus of the fifth pair of peraeopoda is about as broad as long. 



aa 3. The fifth pair of perajopoda are shorter than the fourth. The 

 inner ramus of the second pair of uropoda is longer than 

 the outer _ 5. Ph. Colletti. 



aa 4. The fifth pair of peraeopoda are about as long as the fourth. 

 The inner ramus of the second pair of uropoda is scarcely 

 half as long as the outer . - 6. Ph. pacifica. 



B. The lower front corner of the carpus of the fifth pair of peraeopoda does 



not project beyond the under margin of the joint __ 7. Ph. teiiella. 



K. Sv. Vet. At. Sandl. Band. 22. N:o 7. ^° 



