492 JIADIATA. ASTERIADjE. Priapulus. 
Length about 6 inches, diameter half an inch ; the middle of the body is 
nearly of equal thickness, divided into flat smooth rays, with scattered glan- 
dular pores ; the anterior portion is enlarged, annulated, and longitudinally 
striated ; mouth orbicular, marginated, the disc, within, armed with sharp 
tricuspidate teeth ; the posterior part of the body is also enlarged, obscurely 
annulated and rough, with glandular tubercles ; vent semilunar, with a late- 
ral pore ; the branchiae proceed from the margin of the vent, in the form of an 
elongated process, two or three inches long, tapering, and closely covered 
with simple produced papillae ; from one edge of the branchiae a tendinous rib 
arises, extending nearly to the mouth» — This genus has numerous relations 
to the Holothuria, and a few also to the Annelides. One specimen occurred 
to me in Zetland, in 1810, and two have recently been found by Dr Cold- 
stream, at Leith. 
