PELTOCEPHALA. 
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first found by Dr. Philippi in the Mediterranean. Mr. Spence 
Bate discovered it on our southern coast. 
Legion III. P CECIL OP ODA,* Latr. 
Mouth adapted for sucking. Peet 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 SIPHONOSTOMA ,+ 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. Poot-jaws well developed. 
Tribe 1. PELTOCEPHALA, M. Edwards . 
Head shaped like a buckler, % provided in front with fron- 
tal plates and short antennae of two flattened joints. 
* YlouaXos, various, and ttovs, foot. 
f a tube, and (rro/xa, a mouth. 
J Hence the name, ireA tt?, a shield, and Ke<pa\y], a head. 
