On the Classification of the Crustacea Choristopoda. 305 
poe 1l. SPHEROMINLZE.—Lamella appendicis caudalis externa sub interná 
se latens. 
l. Corpus in globum contractile. 
G. 1. SrnurRowa, Latr.—Lamelle appendicis caudalis subeque. 
2. Corpus in globum non contractile. 
G. 2. Cvwopocza, Leach, Edw.*— Caput valde transversum, multo convexum. 
Lamelle appendicis caudalis subequa. 
G. 3. CERczrs, Edw.—Caput parce transversum, subtriangulatum, vix convexum. 
Antennz lma quoad basin capite tectz, processu non sejuncte. 
G. 4. CassrprNA, Ldw.—Corpus latum; caput valde transversum.  Lamelle ap- 
pendicis caudalis angusta, valde inzquz, externà parvulá. Antenne lme quoad 
basin processu frontis sejunctz. 
G. 5. AwPnonorpEuM, Zdi.—Antenne quoad basin lamellate portentose productee 
ultra capitis frontem. 
Subfam.2. NESJEINJE.—Lamella appendieis caudalis externa saliens, sub in- 
terná se non latens, usquam aperta. Pedes nulli ancorales. 
G.1. Nzsua, Leach, Edw.|—Lamella caudalis externa recta. 
G. 2. CawrEcoPzA, Leach. Lamella caudalis externa arcuata. 
Subfam. 3. ANCININ AZ.—Pedes 4 antici ancorales. 
G. 1. Awociwus, Zdw.— Appendices caudales uná lamellà oblongá saliente basique 
brevissimo instructe.—4An tribus Anisopodorum est genus Ancinus ? 
TRIBUS II. 
ATNTISTOTPODA. 
Subtribus I. SEROLIDEA, vel AursoropA CywoTHoIcA. 
Fam.I. SEROLID/JE. 
Appendices abdominales sex antice liberz, subnatatoriz, quatuor 
sequentes branchiales, bene lamellatze, ultimze ac in Cymothoadis. An- 
tennz l1mz sub capite insitze. | 
G. 1. Sznous, Leach. 
Fam. IL PRANIZIDJE.f 
Appendices abdominales tote ac in ZEgidis. Antenne lm: sub 
capite insite. Pedes thoracis numero decem, paribus duobus anticis 
rudimentariis. "lhoracis segmenta numero quinque non superantia. 
Subfam.l. PRANIZINJE.—Caput parvum. Mandibule vix salientes. 
G.1. PmaawuaA,.Leach. —— 
Subfam.?. ANCEINAZE.—Caput grande. Mandibule ultra caput longé exserte 
G. 1. ANckEUS, Asso. 
Subtribus II. ARCTURIDEA, vel Aursoropa Iporzica. 
Fam.Il. ARCTURID/E. 
Subfam.1. ARCTURINJE.—Opercula abdominis ad ventrem stricte appressa. 
* Genus Dynamena, Leach, is included. T Genus Cilicca, Leach, is included. 
1 Pranisiens, Edw. Crust. iii, 92. 
SECOND SzxRrES, Vol. XIV, No. 41.—8Sept, 1852. 99 
b 
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