BOHIHOfl 131 



ol.ject may not iiii.-~l.-ad tin- n!>M-r\.-r. would n-o,,. i ,!,., 



.HI.- view, tlu- hair is crownnl hy a globular format ion, of N ,lid appear- 

 ("iider the other, tin- summit is partitioned into three divi-ion- 

 r uicinlHjn, reBCiiililinu leave* opening and elo-ing. like so many forcejw, 

 t.i cla.-p and retain minute fragment u them. From tlii> Miinmit. 



Bj ti-ili.l in OIK- >pecie*. it is denominated /'..//,///,/>//; /;////. l.v 

 Tin- hair or stnlk seems cylin.lric.il. and sometimes as if oc- 

 rupird In a i-haiiiu'l or internal MilMainv in a vacnitv. 



The K-ii-th of tli.- loniroft stalk IB about tenor t\v.-l\<- tim.- the 

 diameter of the expanding leaves. II. .. these leaves or amis of the 

 ire \arion*|y shaped, a may IK- stvu on inspin-tinj; the tiirun- . 

 and they an> often \ :\-e. 



\aniination of ninny, this portion in found of diU'en-nt 

 lonnation in various sjK-dmenH. Tims: 



1. The head i-; very >hort, aa if imperfectly developed. 



_'. The head, when closed, is larjr, and iH-seinhlos u minute pomegran- 

 .ite ; hut when opening completely, the arms of tin- forceps of some xpeci 

 men* seem to terminate in n long ckw. 



3. The head resembles that of a duck. It is very long when closed, 

 with three arms like the mandibles of that animal, which are apparent K 



te. When employed actively, all the arms unfold with singular 

 motion, and .stand almost at ritrht angles to the stalk. 



Pedicellarise cover the Echinus in thousands. They are of various 

 dimensions in large specimens, some half an inch long. If rising from 

 the line red epidermis when present, their motion is well exposed, as re- 

 -embling the intlection of the suckers, bending from side to side, the 

 head describing nearly a circle by the turning of the stalk, the whole in 

 great activity. But there is no essential diilerence between the figure and 

 the motion of the Pedicellaria) on the larger and on the smaller Echini. 

 The stem is certainly hollow, and it may be that the lower part affixed 

 to the epidermis or to the shell is rigid. The Pedicellaria) are dispersed 

 everywhere among the spines, also on the bare portion which surround.- 

 the mouth of the living animal. They are not alike numerous in all 

 specimens. Plate XXXII. IL-. ;, 7, 8, 9 10, 11. 



