* 
On the Classification of the Crustacea Choristopoda. 305 
Subfam. 1 .—Lamella appendicis caudalis externa sub interna 
se latens, 
1. Corpus in globum contractile, 
G. 1, Srpnenoma, Latr—Lamelle appendicis candalis subeque. 
2. pees in globum non contractile. 
2. Cymopocra, Leach, Edw.*—Caput valde transversum, multo conyexum, 
~*~ Lamelle hs gigi par subeque 
G. 3. Crrcrts, Hdw—Caput ce transversum, subir pa leet vix conyexum. 
Antenne Imz quoa i ite n 
G. 4, ee mina, Ldw.—Corpus latum; caput valde is Lamelle ap- 
dicis caudalis aren valde inaque, externa parvuli. Antenne Ime quoad 
sin gone ok fronts sejuncte. 
M, dw. —Antenne quoad basin amneate } portontose product 
ultra capitis Ganka. 
oat é NES AIN A. es ag, SR eae ad externa saliens, sub in- 
é non latens, usquam aperta nulli anco 
m i ae Leach, Edw.}—Lamella cau ah externa recta. 
G. 2. Camprcorza, Leach. Uamella candalis externa arcuata. 
Subfam, 3. ANCININ .—Pedes 4 antici ancorales. 
G.1. Aycinus, Hdw—Appendices caudales und lamella nee wake ey basique 
brevissimo instructe—An tribus Anisopodorum est genus An 
TRIBUS. IL 
ANISOPO DA. 
Subtribus I. SEROLIDEA, vel Anisoropa Cxwomnorts. 
Fam. I. SEROLIDA. 
Appendices abdominales sex antice liberee, subnatatorise, quatuor 
Sequentes branchiales, bene lamellate, ultima ac in Cymothoadis. An- 
teanze lmz sub capite insite. 
G.1. Sxnours, Leach, 
Fam. Il. PRANIZIDA.4 
Appendices abdominales tote ac in Zgidis. Antenne Imex sub 
capite insite. Pedes thoracis numero decem, paribus duobus anticis 
rudimentariis. ‘Thoracis segmenta numero quinque non superantia. 
Subfam. 1. PRANIZINA,—Caput parvum, Mandibule vix salientes. 
G.1. Prawtza, Leach. 
Subfam. 2. ANCEIN.Ai.—Caput grande. Mandibule ultra caput longé exserte, 
G. 1. Anceus, Risso. 
Subtribus II. ARCTURIDEA, vel Antsopopa IpoTzica. 
Fam. L ARCTURIDE. 
Subfam. 1, AROTURIN i-Orpercals abdominis ad yentrem stricte appressa, 
$ Gems Dynamena, Leach, i is included. + Genus Cilicea, Leach, is included. 
92. 
Szcoxp —-e Vol. XIV, No. 41.—Sept, 1852. 39 
