INDEX AND GLOSSAKY. 



Abranchiate (Annelidas), 160. 



AcalepJus (Jelly Fishes), 217; 

 structure, 220 ; classification, 

 220 ; Pulmonigrade order, 221 ; 

 Ciliograde, 222 ; Physograde, 

 223 ; Cirrhigrade, 224 ; repro- 

 duction and metamorphosis, 

 226, 232. 



Acephala, testaceous (Conchifera, 

 or Bivalve Mollusca),ti6 ; struc- 

 ture of animal, 67 ; habits, 69, 

 70; food,71; structure of shells, 

 71, 72 ; classification, 72. 



Acephala, tunicated (see Mollusca 

 tunicata). 



Acetabularia(a. Mediterranean sea 

 plant), 94. 



Actinia mesembryantliemum (Com- 

 mon Sea Anemone), 82. 



Actinia (Sea Anemones), de- 

 scribed, 123 ; their structure, 

 124. 



Adductor muscles, of a bivalve 

 mollusc, are those which hold 

 the valves of the shell together, 



Agar-Agar (an East Indian sea- 

 weed), 107. 



Albatross, 56. 



Alcadae (a family of sea-birds), 

 289291. 



Alcyonium digitatum (Dead-men's 

 Toes ; one of the Zoophytes of 

 the order Asteroida). account 

 of, 79, SO; alluded to, 185. 



Alga, pi. Algae (Sea-weeds). A 

 large class of Cryptogamic 

 plants inhabiting salt and fresh 

 water. An outline of their 

 history will be found in Chap- 

 ter IV., and an account of some 

 microscopic \imd&(Diatomaceai) 

 in Chapter VII., page 204. 



Algologist : one who investigates 

 the history of the Alga or Sea- 

 weeds. 



Alva marina (Zostera), used for 

 bedding, 81. 



A mbulacra : spaces on the shell 

 or skin of an Urchin or Star- 

 fish, pierced with rows of holes, 

 through which sucking-feet are 

 protruded, 74, 171, 177. 



Ammophila arundinacca (Sand- 

 reed), 12. 



Amphidotus cordatus (Heart Ur- 

 chin) described, 73. 



Amphitrite (one of the Annelides), 

 164. 



Analogue, ^ When two plants or 



Analogous, > animals of different 



Analogy, J orders or genera 

 resemble each other in habit, 

 or in some prominent character, 

 and appear to occupy a similar 

 position in the groups to which 

 they respectively belong, such 

 plants or animals are said to be 

 analogues one of another. 



Anatidce (an order of sea-birds, 

 containing Ducks and Geese), 

 285. 



