J24 WORMS. 



ing of numerous cells united together and interwoven 

 like a mat. 



76. TUBULAR i A'. Stem tubular, simple or branched, 

 fixed by the base : animal proceeding from the end of 

 the tube, and having its head crested with teutacuki. 



77. CORALLINA, Animal growing in the form of a 

 plant: stem, fixed, with calcarious subdivided bran- 

 ches, mostly jointed. 



78. SERTULARIA. Animal growing in the form of a 

 plant : stem branched, producing polypes from cup- 

 shaped denticles or minute cells* 



79. PENNATULA. Animal detached, of various shapes, 

 supported by a bony part within, naked at the base, 

 the upper-part with generally lateral ramifications 

 furnished with rows of tubular denticles producing 

 radiate polypes from each tube. 



80. HYDRA. Animal fixing itself by the base, linear, 

 gelatinous, naked, contractile, furnished with setace- 

 ous tentactila or feelers, inhabiting fresh waters, and 

 producing its deciduous offspring or eggs from the 

 sides. 



ORDER T. INFUSORIA. 



Minute animalcules, seldom visible to the naked eye, 



81. BRACK ION us. Body contractile, covered with a 

 shell, and furnished at the head with ciliate rotatory 

 organs. 



2. VORTICELLA. Body contractile, without shell, fur- 

 nished with ciliate rotatory organs. 



83. TRICI-IOOA. Body invisible to the naked eye, trans- 

 parent, hairy or horned. 



84. CERCARIA. Body invisible to the naked eye, trans- 

 parent, furnished with a tail. 



86. LEUCOPHRA. Body invisible to the naked eye, 

 every where ciliate. . 



S6. BURSARIA. Body quite simple, membranaceous, 

 hollow like a purse. 



87. GONIUM. Body invisible to the naked eye, quite sim- 



ple, flat and angular. 



88. COLPODA. Body invisible to the naked eye, quite 

 simple, transparent, flat and sinuate. 



89. PARAME'CIUM. Body invisible to the naked eye, 

 quite simple, flattened, oblong. 



90. CYCLIDIUM. Body invisible to the naked eye, quite 

 simple, transparent, flat, orbicular or oval. 



91. VIBRIO. Body invisible to the naked eye, quite 

 simple, cylindrical and elongated. 



62. BACILLARIA. Body consisting of cylindrical straw- 



