TABLES. 

 INARTICULATA. 



107 



CIRCULATION 



through the System. 



Simple general per- 

 colation of the nutri- 

 tive fluid through the 

 pores of the animal 

 mass. 



MUSCLES 



and solid frame-Kork 

 on which they rest. 



The general animal 

 mass possesses con- 

 tractility, but rarely 

 distinct muscular fi 

 bres. This general 

 contractility gives rise 

 to the requisite mo 

 tions of the parts, and 

 to locomotion in some 

 genera ; but many are 

 permanently attached 

 to a single spot. 



NERVOUS SYSTEM 



and Senses. 

 No distinct nervous 

 system, but apparent- 

 ly a dilTused sense of 

 touch, or rather ir- 

 ritability from contact 



REPRODUCTION. 



Fissiparous as well 

 oviparous ; the 

 latter obscure and ap- 

 proaching to gemmi- 

 parous, the system is 

 consequently monce- 

 cious. 



Traces of a vascu- 

 lar system with 

 cordal sinus exist in 

 this class, but they 

 are obscure and con 

 founded with the 

 aquiferous tracheae 



Distinct muscular 

 fibres, which, in the 

 echini move the spines 



.\ vast number of 

 filaments protruded; 

 through the perfora-i 

 tions of the shell in^ 

 the echini and asteriae 

 and attaching them- 

 selves to neighbour- 

 ing bodies, co-operate 

 in locomotion, much 

 as a vessel in harbour! 

 is warped along by 

 cordage. | 



Same as above. 



Fissiparous as well 

 as oviparous ; moncE- 

 cious ; the ovarial 

 system perfectly dis- 

 tinct, and traces of a 

 fecundating system. 



Regular vascularl Distinct muscles; Nervous filamentsj No longer fissipa- 

 system, with an aor- attached to the shell and ganglions. SenseVous, but oviparous 

 tal heart. in thcconchifera; lo-of touch is very ex-|and monoecious, as in 



comotiori various. quisite, especially a-jthe last division. 



Some conchiferalong the margin of 

 are permanently fix- the mantle in the con- 

 ed ; those which, chifera; but there is 

 change iheir place, probably no other 

 have a projecting specific sense. 

 muscular foot. 



Generally as in the As in last division ; 

 last division ; but the but the muscular sys- 

 cephalopoda, (cuttle tcm is far more ad 



fish) have two dis 

 tinct branchial hearts 

 and one aortal. 



vanced in the cepha- 

 lopoda. 



Cerebral ganglionj Systems very van- 

 near origin of aso-'ous, being either mo- 

 phagus, with optic, noecious, with or with- 

 and sometimes audi- out reciprocal fecun- 

 tory processes ; dis- dation. Some genera 

 tinct ganglions for Jire oviparous, others 

 sensation and motion . ovoviparous. 

 System most deve- 

 loped in cephalopoda, 

 which alone possess 

 organs for hearing ; 

 but sight and touch 

 are common to the 

 whole division. 



