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" a G'enera. of Cycqacen | 225 
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' . Anr. IX. p RN of some Genera of apio ay FK. v Dana. 
SE CDM 
As a preface to the Ad iis which joo8A d Oüdlioh : 
of Crustacea is here given ; ; it is made out so as to exhibit to some 
extent the parallel relations of the several orders and subdivis- 
^ ions. " 
| CRUSTACEA. DA 
Subelassis]. — | Subclassis II. , Subclassis II. 
PODOPHTHALMIA. EDRIOPHTHALMIA. MANDYATA.lI| 
Ordol. DECAPODA. | Ordo 1. CHonisTOPODA.* | 
Tribus |. D k Tribus 
.l. Brachyura. | 1. Isopoda. 
2. Anomoura. 2. Limipoda. 
3. Macroura. 3. An 
Ordo 2. "ScHIZOPODA. Ordo 2. ENTOMOSTRACA. 
Subord. 1. Subord. 2. Subord. 3. 
GNATHOSTOMATA.T|ConMosTOMATA.1| MEROSTOMATA.S 
Tribus 
l. Branchipodacea. ; 
Tribus 2. Limnadiacea. Tribus , 
1. Stomapoda. 3. Daphniacea. Tribus Tribus 1]. Cirripeda, 
. 2. Diploopoda. 4. Cyclopacea. 1. Caligacea. 1. Limulacea. Or 
- 5. Cypridacea. 2. Lernsacea. Balanacea.'l 
3. Nymphonacea. 
Ordo 3. 'T'aiLosITA. 
- | Order ENTOMOS'TRACA. 
| 
| "Tribe CYCLOPACEA. 
— To avoid explanations in the following descriptions, we here 
enumerate the prominent external characters of this tribe. 
* From xeereros separate, and movs foot, alluding to the fact that the pairsof feet belong 
each to a distinct segment of the body. 
| t From qvafos jaw, and copa mouth, alluding to the mouth being furnished with proper 
Li 
mandibles and maxilla. (s 
I From xogyuos trunk, and copa mouth, the 20 ME the form of a movable trunk. 
$ From unos thigh, and cropa mouth, the basal joints of the legs constituting the jaws. 
l| From pa»óvn a cloak, alluding to the covering in which the body of the animal is en- 
closed. * 
1i "The Cypris-like young of several Anatife were collected and figured by the writer, 
and the metamorphosis traced to the adult state. When first found swimming free in the 
ocean, they were taken for a new genus allied to Cypris, so similar are their forms. 
The fact that the body and legs of the Cirripeda shed their skin, is further evidence of 
the propriety of placing this group with Crustacea. 
"The pedicel of the Anatife corresponds to a pair of antennz in. the young ; ; the animal 
attaches itself by the sucker-like disk terminating these organs before the. metamorphosis 
commences, and i in a group of Anatifee all the different stages may gine from the 
pair of distinct antennz to the fixed simple pedicel. 
SECOND Sznizs, Vol. I, No. 2.—March, 1846. 29 
js a T4 
