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digits bearing claws, whereas the echidna has five. Echidna- 

 tridactylata and Echidna- pentadactylat a might be better terms. 



Echidna. — This name, which is Greek for a viper, is applied 

 to several snakes. It has, however, of late been usurped by 

 a now well-known Australian quadruped, which has only the 

 most remote alliance with snakes. The student must be 

 careful not to confuse Echidna with Echinus, since the latter, 

 which ,is Greek for hedgehog, and is appropriated by the sea 

 urchin, might seem much more descriptive of the porcupine- 

 like animal which has by mistake got its name from that of 

 a snake. 



Echinate, covered with spines or prickles, like a hedgehog 

 or a porcupine. 



Aculeate, from the Latin aculeus, a prickle. Having 

 prickles applicable to a less pronounced condition than that 

 which should be termed echinate ; prickly rather than spiny. 



Setose, from seta, the Latin for a bristle, a short strong 

 hair. Any animal or plant having strong, short hairs which 

 do not amount to spines may be described as setose. 



Echini, and Echinodermata, spiny-skinned. The names 

 given to the large family of sea-urchins, the shelly investment 

 of which is covered with spines. The latter term is, so far as 

 derivation is concerned, applicable to a hedgehog, a porcu- 

 pine, or an echidna, but is never so employed. 



Diastema, a gap or cleft ; a vacant space between objects 

 standing in a row. The word is chiefly used in describing 

 the arrangement of the teeth. If the teeth, as in the human 

 mouth, touch each other by their sides, there is no diastema. 

 When used in combination with other words it usually 

 means an abnormal fissure or cleft. 



Intercellular and Intracellular. — The one means between 

 the cell structures and the other inside the cells themselves. 



Mycologist or Fungologist. — Those who make a special 

 study of the great family of plants to which mushrooms, toad- 

 stools and blights belong are called mycologists, or sometimes 

 fungologists. The former is much to be preferred as being 

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