ORDER DECAPODA. 
195 
Mysis, Latr ., 
Have the antennae and feet exposed, the testa elongated, 
almost square or cylindrical, the eyes very much approx- 
imate, and the feet capillary, as it were, formed of two 
threads. ( Mysis Fabricii , Leach.) 
Cryptopus, Latr., 
Have a subovoi’d testa, enlarged or swollen at intervals, folded 
interiorly on the sides, enveloping the body as well as the 
antennae and feet, and leaving discovered underneath nothing 
but a longitudinal cleft. The eyes are wide apart. The feet 
are in the form of lashes, with a lateral appendage. {Crypto- 
pus Defrancii , Lat.) 
Sometimes the eyes are concealed. The intermediate an- 
tennae are conical, inarticulate, and very short. The lateral 
ones are composed of a peduncle and a thread, without dis- 
tinct articulations. Their base presents no scale, at least 
projecting. 
Mulcion, Latr. 
The body is very soft, with the thorax ovoid. The feet are in 
the foim of a lash, and the majority at least have an appen- 
dage at their basis. The fourth pair is the longest of all. 
{Mulcion Lesueurii, Latr.) 
Nelalia, which we had at first placed in this section, not 
having natatory appendages under the last segments of their 
body, and their feet being pretty similar to those of Cyclops, 
w ill pass \\ ith condylura into the order of branchiopods, of 
which they will make the beginning. Nebalia, from their very 
projecting eyes, which appear to be pedicled, and from some 
other characters, seem, with zoe, to link the schizopoda with 
the branchiopods. 
