ANNELIDANS. 333 



lateral rows. Their mouth is terminal but 

 not formed on one type ; in some it is simple, 

 orbicular or labiated ; in others it consists of a 

 proboscis often having maxillae. They have 

 a knotty spinal marrow, in this being superior 

 to the Molluscans and approaching the Con- 

 dylopes. They have red blood, and their 

 circulation is by arteries and veins, but they 

 have no special organ for the maintenance 

 of the systole and diastole, their Creator not 

 having given them a heart, but where the veins 

 and the arteries meet, there is an enlargement, 

 and the systole and diastole is more visible, 

 as Cuvier remarks, than in the rest of the 

 system, these enlargements therefore seem to 

 represent a heart. 



Savigny, in the third part of his Systeme des 

 Animaux sans Vertbbres divides them into five 

 Orders, of which he gives only the characters of 

 the four first, intending to publish, in a supple- 

 ment, his account of the fifth ; these Orders he 

 arranges in two Divisions the first including 

 those that have bristles for locomotion, and the 

 second those that have them not. 



1 . His first Order he denominates Nereideans, 1 

 and characterizes them as having legs provided 

 with retractile subulate bristles, without claws ; 

 a distinct head with eyes and antennae ; a pro- 



1 Nereidece. 



