The Bass and their Relatives 



345 



this genus and in Calamus the second interhaemal spine is very 

 greatly enlarged, its concave end formed like a quill-pen and 



FIG. 282. Calamus bajonado (Bloch & Schneider), Jolt-head Porgy. Fez de Pluma. 



Family Sparidce. 



including the posterior end of the large air-bladder. This 

 arrangement presumably assists in hearing. Of the penfishes, 



FIG. 283. Little-head Porgy, Calamus proridens Jordan & Gilbert. Key West. 



or pez de pluma, numerous species abound in tropical America, 

 where they are valued as food. Of these the bajonado or 

 jolt-head porgy (Calamus bajonado) is largest, most common 



