CRUSTACEA. 
242 
is parasitical, and, as I tliink I perceive in it a vestige of a sucker, I 
have placed it among the Poecilopoda. I would observe, however, 
that the feet, the anterior excepted, closely resemble those of Cyclops, 
and that the females also carry their ova in two sacs situated at the 
base of the tail as in the latter genus *. 
In the remaining Lophyropa of our first division, the thorax, as 
in the Condylura, is divided into several segments, the first of which 
is much the largest ; they have but one eye situated in the centre of 
the front between the superior antennae, such is the 
Cyclops, Mull., 
So well studied by Jurine, Sen., and Randohr. The body is more 
or less oval, soft or gelatinous, and divided into two portions, one 
anterior, composed of the head and thorax, the other posterior, or 
the tail. The segment immediately preceding the sexual organs, and 
which, in the female, is provided with two appendages in the form 
of little feet — -fulcra, Jurine — maybe considered as the first of the 
tail, which is not always decidedly or suddenly distinguished from 
the thorax. It is composed of six parts or segments ; under the 
second in the males, are two articulated appendages, sometimes sim- 
ple, and at others Avith a small branch on the inner side of various 
forms, and constituting, either wholly or partially, the organs of 
generation. The vulva, in the other sex, is situated on the same 
segment. The last one is terminated by two points or stylets, form- 
ing a fork, and is more or less furnished with setse or peniform threads. 
The other or anterior portion of the body is divided into four seg- 
ments, the first of Avhich is much the largest, and composes the head 
and part of the thorax, which are also covered by a common scale. 
In it, are inserted the eye, four antennae, two mandibles — mandibules 
internes of Jurine, furnished with a palpus, either simple or divided 
into two articulated branches, two jaws — mandibules externes, or 
levre avec des barbillons of Jurine f , and four feet, each divided 
into four cylindrical stems furnished Avith hairs or bearded threads ; 
* Near the Condylurae should be placed the genus Cuma, M. Edwards, Ann, 
des Sc. Nat. XIII, xiii, B. The superior antennae are rudimental, and consist of 
but one joint. The head is distinct from the thorax, which is divided into four seg- 
ments, to the first of which are attached the four anterior feet, each of the follow- 
ing having a pair ; all these feet are natatory, directed forwards, and have no hook 
at the end ; the two first pairs alone are bifid. 
The genus Pontia, Id., Ib., XIV. appears to us to approach Cyclops. The 
head is distinct from the trunk, and terminated by a rostrum which is rather acute 
and appears to be formed of two pieces ; it has two sessile eyes ; four antennae, the 
superior of which are setaceous, multi-articulated and ciliated ; the inferior are 
pediform, composed of a peduncle, serving as a base to two divisions or branches, 
each terminated by a pencil of hairs, one of them having two Joints, the last widened 
at the end, and the other consisting of one. The thorax is divided into five annuli, 
and has six pairs of natatory and bifid feet. The abdomen is formed of two segments 
and terminated by two spatula- like appendages or fins. 
-f- According to the successive order of the parts of the mouth in the Decapoda, 
the part situated immediately beneath the mandibles is the ligula ; but the denta- 
tion of those here spoken of indicates maxillary organs. The ligula may have 
escaped the notice of M. Jurine. 
