20 



CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. 



CYLLOPODIDtE. 



why it is placed here in the family Cyllopodidse are thus mostly negative. The eharac- 

 teristic of the straight first pair of antennae does forbid its ranging in any of the last 

 six families of the present system (see Part I. 1, p. 3). The great distance between the bases 

 (the points of fixation) of both the pairs of antenna; does not allow of its introduction in 

 any of the first ten families except in Cyllopodidce or Paraphronimidce. The form of the 

 head and possibly also the shape of the second and seventh pairs of peraeopoda hint to 

 Paraphronimidce, but the eharacter of the second pair of antennas and their presence in 

 the female congrues best with Cyllopodida?, and, as the characteristic of the second pair 

 of antennas is more important in systematical view than the form of the legs, I previously 

 place it as the second genus of this family. 



1 CYLLIAS TRICUSPIDATUS, H. STREETS, 1877. 



Diagn. Pedes percei primi paris robusti, pedibus secundi paris breviores, carpus metacarpo longior ac 

 multo latior. Pedes secundi paris teretes, carpus metacarpo longior, processus terminales 

 metacarpi longitudinem dactyli requantes. Pedes uri primi et secundi parium subaequales, 

 apicem pedum ultimi paris non attingentes. Rami pedum uri serrati. Telson curtum. 



The first pair of perceopoda are robust, shorter than the second; the carpus is longer and 

 much broader than the metacarpus. The second pair are slender, the carpus is longer 

 than the metacarpus; the apical metacarpal processes equal the length of the dactylus. 

 The first and second pairs of uropoda are subequal, not reaching to the end of the last 

 pair. The rami of the uropoda are serrated. The telson is short. 



Colour. ? 



Length. 6—8 mm. 



Hab. The North Pacific. (Streets). 



Syn. 1877. Hyperia tricuspidata, H. STREETS. 



1887. Gyllias tiricitspidatus, 



C. Bovaluus. 



"Contributions to the Natural History of the 

 Hawaiian and Fanning Islands and Lower 

 California». Bulletin of the U. S. Natio- 

 nal museum. 1877. N:o 7, p. 125. 



"Systematical list of the Amphipoda Hyperi- 

 idea». Bih. t. K. Sv. Vet. Ak. Handl. 

 Bd. 11. N:o 16, p. 13. 



The description of Streets follows here: 



The head is large, deeper than broad, irregularly quadrangular from a lateral view, 

 excavated in front. The head is larger in the female, but the general shape is the same. 



The eyes are large, occupying most of the lateral portion of the head. 



The first pair of antenna are shorter than the head, stout; peduncle short, four- 

 jointed; first joint longest, distal end enlarged; the second, third, and fourth short, together 

 shorter than the first; fiagellum broader than the peduncle, oval, acute at the apex, about 



