i\\i-:h'ri:iih'.\ri:s. h-oi \ nwoirMs 4i 



in each alcoNC nvc (indloimcdl, i. v. so const I'lict cd as to show the internal 

 or*!;ans ot tyi)ical nuMnluTs of each liioup. In such cases, arhitrarv 

 colors chosen to desit^natc the various systems of or«!;ans are adhered 

 to consistently' throutihout the series. For exaniph'. the di^esti\'e 

 system is shown in yellow, heart and hlcHjd-vessels in red. orj^ans of 

 excretion (kidneys) in t!;re(^n, re])rodiictive system in j»;rav. and the brain 

 and other parts of the nervous system in black or neutral color.] 



The minute wheel animalcules comj)rise many ex(iuisite and 



«>;rotes(|U{^ forms, some of which construct tul)es of ji;ela- 



Alcove 6 ,• 1 , 1 • 4. \ i- L- ^i 



„ ., tnious substance, sand-*!;rams, etc. A tew ot tlie species 



Rotifers ,■ i i- <• • ,• 



are parasites, but most ot ttiem live a tree, active live. 



They are aquatic and found mainly in fresh water. 



The sea-mats in Alcove 7 are plant-like animals which lead the 



colonial form of life. The majority of the species 



r, ^°^t J are marine, although a few occur in fresh water. 



Sea-Mats and 



Lamp-Shells ^^^^^ lamp-shells shown in this alcove superficially 

 resemble clams, but by structure are more closely related 

 to the worms and starfishes. 



Alcove 8 is occupied by the sea stars, sea urchins, sea-cucumbers 



and sea liUes. The sea-star is the pest of the oyster beds, 



^^If J where it feeds on oysters and destroys them in large 



Their Relatives numbers. The brittle stars are so called because of their 



habit of dropping off one or more arms when handled or 



attacked. These, however, are later regenerated. 



The annulates, tji^ified by the familiar earthworm, are worms 

 whose bodies are made up of rings or segments They 



cove ^^^ inhabitants of both fresh and salt water, many 



Annulates 



kinds living in the mud and sand of the shore while 



others bore into wood and shells. The marine annulates are often 



very beautiful in color and greatly diversified in form and habits, 



as illustrated by the models, many of which are greatly enlarged. 



The ''houses" that these annulates build are often very beautiful 



and interesting. In the \\'indow is a group showing a section of mud 



flat on the New England coast, with the variety of worm-life found 



in what to the casual observer seems to be an uninhabited area, and 



illustrating some of their habits. 



Arthropods include the famiUar crabs, lol:)sters, insects and 



their relatives. The number of existing species in 



, , J this group is greater than that of all the rest of 



Arthropods i • , i i i i • i -v- i 



the animal and vegetable kingdoms together, jso other 



group comprises so many species useful or harmful to man. In the case 



in the center of the alcove is a model sho^^^ng the anatomy of the 



