TABLES. 



LATA. 



109 



CIRCULATION 



through the System. 

 Regular sj'stem of 

 vessels, with an aor- 

 tal heart. 



MUSCLES 



and solid frame-work 

 on which they rest, 

 and organs of loco- 

 Motion. 

 Regular system of 



muscles: twelve many 



jointed legs. 



A dorsal and ab- 

 dominal vessel, with 

 two lateral vessels and 

 numerous ramifica- 

 tions : no distinct 

 heart. In the earth- 

 worm the system is 

 more advanced, the 

 dorsal and abdominal 

 vessels being connect 

 ed by muscular si 

 nuses, forming as it! 

 were groups of hearts 



NERVOUS SYSTEM 



and Senses. 

 Series of ganglia, 

 connected by a double 

 nervous cord, sense 

 only of touch, having 

 no distinct head or 

 organs of sight, &c 



Regular muscular 

 fibres. 



Some genera have 

 mamillae, furnished 

 with bristles, which 

 act as legs. 



Nervous cord and 

 ganglia ; sense ofsion 

 touch. Some genera 

 have distinct heads 

 bearing antennae and 

 imperfect eyes. 



REPRODUCTION. 



Monaecio-dioecious, 

 or of reciprocal fe- 

 cundation, oviparous. 



Same as last.divi- 



sel^ StrSTnd v^"^".'"'" """^ '=°™; ^^"^^ "^ ganglia, 

 sei, contractile ana jj^^jg^j system of connected by a double 

 pulsatile^ supplies tbe,,^„g^„l^j. -g^^g^ to nervous cord ; in the 

 which the scaly in -larva state much as in 

 teguments, constitut- the annelida. In the 

 ng an external skele- imago state the gan- 

 ton, affbrd a solid glia approximate and 

 frame work ; gene- coalesce into larger 

 rally six jointed legs, and less numerous 

 and two or four wings masses ; distinct optic 

 in the imago. The nerves, probably also 

 caterpillars have biis- of taste, smell, and 

 tly tufts on their seg hearing ; supposed 

 ments like the an- distinct branches of 

 nelida. nerves of motion and 



sensation. 



office of a sort of 

 heart in giving im- 

 pulse to the circula- 

 tion, which is gene- 

 rally diffused through 

 the system, but as- 

 sisted by lateral ves- 

 sels, sending out loops 

 to particular organs. 



Dioecious oviparous. 



The dorsal vessel is 

 still more analogous 

 to a heart, and con- 

 nected with a regular 

 vascular system. 



Regular muscular 

 system, legs generally 

 exceeding three pair ; 

 the front pair often 

 large claws. 



As in insecta. 



Same as last divi- 

 sion. 



Branches of venae! Regular muscular As in insecta, but 

 cava: sent out to bran- system, having one the nerves and organ 

 chiae, dilate into mus-[pair of large claws of hearing more dis- 

 cularsinuses, forming and four pair of legs, tinctly developed, 

 branchial hearts, and 

 the branchial veins 

 convey the blood back 

 into an oval vessel, 

 forming an aortal 

 heart. 



Same as last divi- 

 sion. 



