Systematical Notes. 



17 



To illustrate the systematical position of the Oxycephalids the 

 following; schematic table is e;iven : 



A. HYPERIIDEA RECTICOENIA. 



The first pair of autcnii;u arc fixed to the an- 

 tei'ior part of the head, they are straight, the first 

 joint of the fiagcllum is hirge, the following few 

 in number and terminal. The second pair are not 

 similar to the first, slender, often angulate. 



a 1. The head is small, not tumid. 



aa 1. The first joint of the flagellum of the first 



pair of antennœ is styliform, not tumid. 

 aa 2. The first joint of the flagellum of the first 

 pair of antennae is lanceolate, tumid. 

 aaa 1. The seventh pair of perseopoda are 



not transformed. 

 aaa 2. The seventh pair of perseopoda are 

 transformed. 

 a 2. The head is large, tumid. 



aa 3 The fii\st joint of the flagellum of the first pair 

 of autennœ is tumid. 

 aaa 3. The seventh pair of peraeopoda are 



transformed. 

 aaa 4. The seventh pair of peraeopoda are 

 not transformed. 

 aa 4. The first joint of the flagellum of the first 

 pair of antenna» is styliform, not tumid, 

 a 3. The head with the perseou is transformed into a 

 balloon-like Ijladder. 



1. ScEsn).«;. 



2. Lanceolid.«;. 



3. VlBILlD^. 



4. Cyllopodid.*:. 



5. PARAPHRONTMID.ä;. 



6. Thaumatopsid^. 



7. MlMONECTlD.«;. 



B. HYPERIIDEA FILICORNIA. 



The first pair of antennie are fixed to the an- 

 terior part of the head, they are straight, the first 

 joint of the flagellum is large, the following many in 

 number filiform (cJ), terminal. The second pair ai'e 

 subsimilar to the first, not angulate. 



b 1. The uropoda with distinct rami. 



l)b 1. The mandibles with palp. 



bb 2. The mandibles without palj). 

 b 2. The uropoda transformed, without rami. 



Novi» Acta Reg. Soc. Sc. Ups. Ser. III. 



8. Hyperiid^. 



9. Phronimid^. 



10 Anchylomerid^. 



3 



