RADI AT A. 



THE radiated animals, usually known under the name of Zoo- 

 phytes, are so called from the peculiar anatomical arrangement of 

 their parts. The mouth is usually central, and the other parts are 

 arranged around it, in a radiated manner. The Star-fish, Sea- 

 nettle, Polypi, &c. are examples of this form. 



ECHINODERMATA. 



Usually of a solid structure, and always having the surface beset 

 with spines or some rough coating. 



EcHfNUS GRANULA'TUS, SAY ; Jmim. Acad. Nat. Sc., ii. 



This animal, from its size, shape, color, and the spines with 

 which it is armed, may be well compared to a chestnut-burr. It 

 is sometimes called the Sea-chestnut or Sea-egg. 



SCUTE'LLA (ECHINARA'CHNIUS) PARMA ? RUMPH. A cir- 

 cular, slightly elevated object, apparently composed of sand. It 

 is found from one to three inches in diameter, and has a central 

 star composed of five leaflets, above. The upper surface is di- 

 vided into small hexagonal areas ; and below, it is irregularly 

 veined. When not rubbed, it is found covered with short, deli- 

 cate spines. 



ASTE'RIAS (GONIA'STER) EQUE'STRIS, LAM.; An. sans Vert., iii. 



242. Encyc. M6th., pi. 101 , 102. 



A fine specimen was thrown upon Phillips's Beach, and found 

 by Dr. Prescott, after a storm. 



ASTE'RIAS ARANCI'ACA, LIN. ; Encyc. Mtth., pi. in, f. 3, 4. 

 A small specimen, was taken from the mouth of a cod-fish. 



