61 



6 

 



_ 81C 



8 

 1 



or divis- 

 of Cole- 

 and tliat 

 e 12,000 

 Jymenoih 

 50,000 is 

 its of this 

 Arthro- 

 f worms 

 oporliou 



land iute- 

 ly 400 are I 

 IndlaUesJ 



and 400 are terrestrial and air-breathers. They are distributed aniou}; 



the classes as follows: 



Ckpiialopoda L'5 



rULMONATA 400 



( Fresh-water 43S 



ruOSOBRANCUIATA < ,, . 



^ Marine 297 



IIlOTEROPODA 28 



Opistiiobranciiiata 



PlEROPODA 



SCAPIIOPODA 



Fresh-water 



Marine 



MOLLl'SCOIDA. 



Braciiiopoda 10 



ASCIDIA... 30 



BllYOZOA 39 



The remaiuiug divisions of the animal kingdom may be estimated to 

 miuiber nearly as follows : 



LAMELLIBRA^X•IIIATA 



53 



25 



4 

 590 

 377 



ECHINODERMATA (123). 



HOLOTHURLDA. 

 ECHINOIDEA . . . 



Crinoidea 



ASTEROIDEA.. 



East iDte 

 coast. «riur. 



32 

 50 



*> 



17 



WCHt 



coast. 

 4 



18 



? 



Medusae : 



Discophora . . . 



Siphono2)hora , 



Ctenophora 



Polypi 



Hydroidea 



COELEXTERATA (144). 



The divisions of Protozoa are well represented in our waters, but the 

 uumbers of our Spongiida, Infusoria and Rhizopoda, have not yet 

 ; been ascertained. 



III.— relations to other realms. 



It has been already remarked that several species of Vcrtebrata are 

 I common to our northern regions and Europe, Asia, etc. Thus, the 



