m 



ZOOLOGY. 



V 28. Gasterosteus. Stickle-Back. GilUmemhrane^ three or 

 - six rayed ; belli/ covered with bony plates : dorsal Jin 

 one, between which and the head, are several sharp 

 spines ; ventral Jins spinous. 



29. Mullus. Surmullet. Head compressed, sloping, scaly ; 

 mouth bearded ; bodi/ covered with large slightly 

 affixed scales, which readily drop off ; gill-membrane 

 ' three rayed. 



SO, Trigla. Gurnard. Head large, covered with strong 

 bony plates ; nose sloping ; gill-membrane seven rayed ; 

 covers spinous ; three slender appendages placed before 

 the pectoral Jins. 



31. Centorogaster. //eac? compressed, smooth; body de- 

 pressed, smooth; gill-membrane seven rayed; Jins 

 spinous; the ventral Jins connected bj a membrane^ 

 with four sharp spines^ and six soft rays. 



32. Trachichthys. Head rounded in front ; eyes large ; 

 mouth wide, toothless : gill-membrane eight rayed, the 

 four lowermost of which are rough on the edges ; scale.f 

 rough, strongly adhering ; abdomen shielded with large 

 carinated scales. 



