177 



which, in all probability, the parts subservient to the reception and 

 digestion of food were placed *. 



This basin, Fig. 3, #, &, c, d, is composed of twenty pieces, in four 

 different series. The first of these series consists of Jive cunei- 

 form pieces, (ossa innominata,) so adapted to each other, as when 

 united, (which, in the living animal, they doubtlessly were, by an ap- 

 propriate ligament) to form a stelliform floweret, fitted by its risings 

 and depressions to articulate with the first vertebras of the trunk. 

 One of these is separately depicted, Fig. 3, (a) and the five are shewn in 

 their natural situation in the centre of the inferior part of the basin, 

 where their several risings and depressions are seen to compose a flori- 

 form figure, which has the appearance of consisting of five petals. 



These are encompassed by five other pieces, (b), which, from their 

 exterior surface being of a trapezoidal figure, are named by Rosi- 

 nus Articuli trapezoides ; but these I shall consider as RIBS. Their 

 outer surfaces are smooth and slightly convex, but their internal sur- 

 faces, (b) are rendered rough and unequal, by several risings and de- 

 pressions, which produce such surfaces as are fitted to unite with the 

 corresponding surfaces of the next series. By the union of these two 

 series of bones is formed the pentagonal base (Basis pentagona, of Ro- 

 sin us) of the pelvis, as is represented Plate XIV. Fig. 2. 



Upon these are placed five other bodies, of an irregular form, which 

 I term CLAVICLES (c). The outer edges of these are flat and smooth, 



* Since it may appear improper, in thefollowing description, to have designated the parts 

 of this animal by terms which belong to the parts of the more perfect animals ; it is necessary 

 to observe, that in the less perfect animals no parts are discoverable, by which those of the 

 encrinus can be so well illustrated. 



Thus a basin, or pelvis, is here formed for the reception of the viscera of the animal, by 

 the ossa innominata and the ribs. From the external part of this basin proceed the a tins 

 of the animal, each of which, as in the more perfect animals, articulates on another bone, 

 which I therefore have termed scapula, and which, like the scapulae of the more perfect ani- 

 mals, is connected by one part with the bones of the arm, and by the other with the ribs j 

 its attachment being rendered still more firm by the medium-of a clavicle. 

 VOL. II. A A 



