ICHTHYOLOGY. 55 



2. Neucrates with an undivided tail. Both these 

 species have a naked depressed head and body, 

 and are remarkable for being frequently found ad- 

 hering so firmly to the sides of sharks and other 

 great fish, by means of the structure of the head, 

 as to be got off with difficulty. The ancients fan- 

 cied that the remora, by adhering to the bottom, 

 could stop the largest ship when in full sail. 



CHAPTER XIII. 



Of Soft Finned Abdominal Fish. 



Q. WHAT arethe principal generaof this order? 



A. 1. Atherina; 2. Salmo; 3. Fistularia; 4'. 

 Esox ; 5 Clupea ; 6. Exocaetus ; 7. Cyprina. 



Q. What species compose the genus Atherina ? 



A. Of tjhe genus Atherina, there are five species ; 

 but it will suffice to describe the Atherina Hepsetus, 

 or common Smelt, found in abundance in the sea 

 near Southampton, and on other coasts of our 

 island. It is about four inches long, has a forked 

 tail, and an almost transparent skin; colour, sil- 

 very tinged with yellow. 



Q. What is the genus Salmo ? 



A. This is a very comprehensive genus, con- 

 taining many species ; the most remarkable of 

 which are 1. Salar ; 2. Trutta; 3. Fario ; 4. Sal- 

 mulus; 5. Salvelinius; 6. Eperlanus; 7. Green- 

 landicus ; 8. Thymallus. 



