20 



CARL BOVALLIUS, AMPHIPODA HYPKRIIDEA. I. 2. 



CYLLOPODID^. 



why it is placed herc in the ffimily Cyllopoclida; are thus inostly negative. The charae- 

 teristic of the straiglit first jjair of antenna; does forbid its ranging in any of the last 

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

 (the points of tixation) of both the pairs of antennte 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 antennse 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 TRICUSPIDÅTUS, H. STREETS, 1877. 



Diagn. Pedes perm primi paris robusti, pedibus secuiuli paris breviores, carpus inetacarpo longior ac 

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

 metacarpi longitudinem dactyli ajquantes. Pedes uri pi-iini et secundi parium subaequales, 

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



The first pair of perwopoda 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. — »Contributions to the Natural History of the 



' Hawaiian and Faniiing Islands and Lower 



Californiai). Bulletin of the U. S. Natio- 

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

 1887. (Jyllias tricuspidatus, » C. Bovallius. »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 foUows 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 antennce 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; flagellum broader than the peduncle, oval, acute at the apex, about 



