16 INVERTEBRATE ANIMALS. 



Group 48.— Order CTENOPHORA. xTs)g, a comb ; <pepo, 

 I carry. Transparent oceanic Actinozoa, resembling in 

 habit some of the smaller Jelly-fish, but much more 

 highly organized. Swimming by means of cilia arranged 

 in vertical comb-like rows. 



H Coloured drawings of Pleurohrachia = Cydippe, 

 Cestum, Idya, &c., chiefly after Blainville, 

 Lesson, and L. Agassiz. 



Jfift^ CaMc €viu. 



The Mark ^y indicates illustrations exhibited in the cases. The coloured 

 drawings are by John Chakd, Liv. Pub. Mus. 



Sub-kingdom MOLLUSCA. 



mollis, soft. 

 Province MOLLUSCOIDA. Ab-normal MOLLUSCA. 



Class POLYZOA. ttoAuj, many; ^wov, an 

 animal. Estimated number of species : recent, 360, 

 (Busk, 1854) ; British, 112, (Johnston, 1847) ; fossil, 

 1,600 ; from the Silurian upwards. 



A monograph of the class Polyzoa, combining the fossil with the 

 recent species, after the admirable method of Milne Edwaeds in 

 his Histoire Naturelle des Coralliaires, may be regarded as an 

 achievement worthy of the ambition of any Naturalist. Taking 

 into consideration the exquisite beauty of the species, their wide 

 distribution in time and space, their convenient size, and the 

 interesting questions connected toith their structure and habits, no 

 other unoccupied Biological field seems to present equal attraction. 



The three groups here assigned to this class are based upon characters 

 by no means satisfactory, but it has been found convenient to retain 

 them. The more scientific distinctions are illustrated by coloured 

 drawings in the upper compartment. 



