3()G AMPniPODA ABEHRANTIA. 



Fam. 3. CYAMID^. 



Cephalon cylindrical, tapering. Pereion broad and flat. Pleon 

 rudimentary. Eyes posterior to the superior antenme. Oral append- 

 ages small. CoxHD fused Mdtli the pereion. Branchiae on the third 

 and fourth segments of the pereion only. 



The animals of this family are parasitic, 



1, CYAMUS. 



Cyamus, LamarcJi, Si/sf. des Anim. sans Vert. p. 166. 

 Larunda, Leach, Linn. Trans, ii. p. 363. 

 Panope, Leach, Eclinb. Encycl. vii. p. 404. 



Cephalon long, tapering, cylindrical, and fused with the first seg- 

 ment of the pereion, which is broad and flat. Pleon rudimentary. 

 Eyes small, situated behind the superior antennte. Superior an- 

 tenna; having a peduncle consisting of three joints and a flagellum. 

 Inferior antennae rudimentary. Oral appendages small, situated 

 at the extremity of the cephalon. Gnathopoda subchelate. 



1, Cyamus gracilis. (Plate LVIII. fig. 1.) 



Cyamus gracilis, Roussel, Ann. Sc. Nat. i. (2 s^r.) pi. 8. f. 24. 

 Edivards, Hist, des Crust, iii. p. 113. 



Pereion narrow, having the third and fourth segments not broader 

 than the second. Second pair of gnathopoda larger than the first, 

 having the palm slightly concave, not defined. Branchiae cylin- 

 drical, single-branched, not longer than the pereion is broad. 



Length ^ an inch. 



Hah. "Infests the heads of whales," (Edivards, I.e.) Cape of 

 Good Hope {Paris Collection) ; and also taken duiing the voyage of the 

 Chevrotte. 



2. Cyamus Delphini. 



Cyamus Delphini, GuSrtn-Menerille, Leonogr. Crtist. pi. 28. f. 5, 



I have not seen this species ; but, judging from Professor Milne- 

 Edwards's description, it appears to be only a variety of C. gracilis. 



3, Cyamus Ceti. (Plate LVIII. fig. 2.) 



Cyamus Ceti, Linnceiis. 



Edwards, Hist, des Crust, iii. p. 113. 



Cephalon long. Second segment of the pereion as long as the cepha- 

 lon, the others shorter and not broader. Eyes approximate. Su- 



