Protozoa and Rotifera at Havana, III. 345 



Mallcate (A). Mallei stout ; maiiiibria and unci of nearly 

 equal length; unci 5- to 7-tootlied; fulcrum short; as in 

 Brachionus UTceolaris . 



Suh-malleatc (B). Mallei slender; manubria about twice 

 as long as the unci; unci 3- to 5-toothed; as in Euchlanis 

 deflexa. 



Virgate (C). Eami as well as mallei rod-like ; as in Fnrcu- 

 laria. 



Foreipate (D). Mallei rod-like; manubria and fulcrum 

 long; unci pointed or evanescent; rami much developed and 

 used as a forceps; as in Difflcna forcipata . 



JSlalleo-ramate (E). Mallei fastened by the unci to rami; 

 manulu'ia 3 loops soldered to the unci ; unci 3-toothed ; rami 

 large, with many stria; parallel to the teeth ; fulcrum slender; 

 as in Melicerta ringens. 



Incudate (F). Mallei evanescent; rami highly developed 

 into a curved forceps; fulcrum stout; as in Asplanclina 

 ehheshornii. 



Uncinate (G). Unci 2-toothed; manubria evanescent; 

 incus slender; as in Stcphanoceros eichhornU. 



Raniate (H). Rami sub-quadrantic, each crossed by two 

 or three teeth ; manubria evanescent ; fulcrum rudimentary ; 

 as in Phllodina roseola. 



The oesophagus, connecting the mastax and stomach, is 

 lined with cilia, which by their vibratory motion cause a con- 

 stant stream of water to flow towards the stomach, carrying 

 particles of food with it. 



The stomach is a large sac with thin walls, and usually 

 contains a number of oil or fat globules. This may be 

 demonstrated by killing rotifers with osmic acid, when the 

 oil globules will be turned black by the acid. It is astonish- 

 ing to see how much may be crammed into the stomach of a 

 rotifer. I have frequently found specimens of Asplajiclmopu.H 

 with six or seven other rotifers in its stomach, and I once 

 found a rotifer that had just made a meal of half a dozen 

 small crustaceans {CJiydorKs). 



There are at least three sets of glands within the body of 

 a rotifer. One pair, the supposed salivary glands, are 



