PELTOCEPHALA. 309 



first found by Dr. Pbilippi in the Mediterranean. Mr. Spence 

 Bate discovered it on our southern coast. 



Legion III. PCEC1LOPODA,* Latr. 



Mouth adapted for sucking. Feet partly formed for walk- 

 ing or prehension, and part branchiferous, and fitted for 

 swimming. Body in the greater part of the species enclosed 

 almost wholly within a buckler, consisting generally of one 

 piece, sometimes of two. 



The various species are parasitical on fishes and other 

 aquatic animals. 



Order SIPHONOSTOMAJ Latr. 



Mouth furnished with a tube which has styliform. man- 

 dibles. Thorax composed of several distinct rings, and with 

 three or four pairs of feet. Foot-jaws well developed. 



Tribe 1. PELTOCEPHALA, M. Edwards. 



Head shaped like a buckler, J provided in front with fron- 

 tal plates and short antennse of two flattened joints. 



* TIolklXos, various, and irovs, foot. 



f 'S.icpwv, a tube, aud aTOfxa, a mouth. 



X Heace the name, tt€\tti, a shield, and Ktcpahr), a head. 



