MARSUPITES. 
Gen. Char. Body orbicular, contained in a pel- 
vis composed of crustaceous plates, having five 
articulated arms or tentacula proceeding from the 
margin : the opening of the pelvis covered by ar- 
ticulated ossicula, in the centre of which the 
mouth is placed. 
Spec. Char. Pelvis composed of sixteen convex, 
radiated, angular plates : the arms dichotomous, 
united to the margin by a corresponding number 
of intermediate semilunar bones : the ossicula 
covering the aperture of the pelvds disposed in a 
])i'oboscideal form. 
