[ 434 3 
Explanation of Plate XXI. 
Fig. i. Reprefents the front of the Red-Sea-Pen a 
little larger than life, as are the figures of the two 
following Sea-Pens. 
а . One of the fins fhewing, the alternate order in 
which the denticles incline like the teeth in a 
faw. 
2. The back of the Red-Sea-Pen, with the rachis 
or middle part between the fins covered over 
with a rough fkin like fhaggreen. 
3. The finger- fhaped Sea-Pen, or Cynomorion , 
called fo from its likenefs to the fliape of the 
Fungus Melitenjis . 
The upper part of this animal is covered over with 
circular cells, one of which is reprefented at 
Fig. 4, from whence proceed Polype-like fuck- 
ers, having eight pennated arms or claws, one of 
which fuckers is figured at 5. 
The Rugae or Furrows in the fwelling part at b , 
fhew that this animal can extend and contract 
this part, perhaps to raife or fall itfelf in the 
fea. 
б. The front of the thorny Sea-Pen, called by Dr. 
Bohadfch Penna grifea . 
7. The back part of it. 
8. Shews the front of one of the fuckers mag- 
nified. 
9. the back view of the fame. 
10. One of the lower fins a little magnified, 
which fhews the pofition of the fuckers, and 
the 
