APODA, 401 
ORDER II. 
—— 
APODA. 
Our second order of the Echinodermata, or the Apoda. comprises 
but a small number of animals closely related to the Holothuriz, but 
which want the vesicular feet of the preceding order. Their body is 
invested with a coriaceous unarmed skin. Several points of their 
internal structure are not well understood. In 
Morpapia, Cuv., 
As in Holothuria, we find a coriaceous body forming a thick cylin- 
der open at both ends, and a tolerably similar internal organization; 
but independently of the want of feet, the mouth is destitute of ten- 
tacula, and is provided with an apparatus of bony parts, but less 
complicated than that of the Echini. 
M. holothuriotdes, Cuy. The only species that I know in the 
Atlantic Ocean. The anal extremity terminates in a point. 
Minyas, Cuv., 
Where the body is also destitute of feet and open at both extremities; 
but its form is that of a spheroid depressed at the poles, and furrow ed 
hike a melon. I can find no armature about the mouth. 
M. cyanea, Cuv., Régn., Anim., IV, pl. xv, f.8*. A beau- 
tiful species of a deep- blue colour that inhabits the Atlantic 
ocean *, 
Priaprutus, Lam., 
Where the body is cylindrical and transversely marked with deep 
annular rugee, terminated anteriorly by an elliptical mass slightly 
wrinkled longitudinally, perforated by the mouth, and posteriorly by 
the annus, from which issues a thick bundle of filaments which may 
be organs of generation, The interior of the mouth is provided with 
a great number of extremely sharp and horny teeth arranged in quin- 
cunx, and directed backwards; the intestine proceeds in a straight line 
from the mouth to the anus. The muscular system resembles that of 
the Holothurie. 
P. vulgaris; Holothuria priapus, Miill., Zool. Dan., XCVI, 
1. It is from two to three inches in length, inhabits northern 
seas, and is the only species known. 
LitHopermis, Cuv.,. 
Where the body is oval and compressed posteriorly; its surface has 
the appearance of being covered with a layer of.stony granules, which 
form an extremely indurated crust. The mouth is surrounded with 
* Taken to France by M. Péron, 
