CLASS CRUSTACEA: OKDEE CIREIPBDIA. 233 



ORDER SIPHONOSTOMA. 



G-eneral Characteristics.— The Siphonostoma (suck- 

 ing-mouth) in their early stages have eyes, jointed hmbs, 

 and swim freely, but when adult they are attached to fish, 

 and liye mainly on the mucus which covers their host. A 

 permanent hold is secured by insinuating their barb-like 

 head into the flesh, often the eye. (Fig. 397.) 



Fi^- S91. Mg. S9S. 



LemtBonlma epratti. 

 Sprat-sucker, attached to eye of Sprat. Baldmm crenatm, Acorn Barnacle. 



ORDER CIRRIPEDIA. 



General Characteristics. — The Cirripeds (curl-footed) 

 in their early stages have eyes, antennae, and limbs. After 

 swimming about for a while they attach themselves to any 

 solid substance, the eyes become rudimentary and the 

 antennae obsolete. The thoracic feet by constant motion 

 create currents of water which float food to the animal's 

 mouth. 



Balanidae, — The Acorn Barnacle is sessile, the shell 



