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Provmonal Arrangement of Familiefi. 

 The genera described are British. 



Family.— TYLID^. 

 Genus 1. — Tylos {Latreille). 



Family.— ARMADILLID^. 



Genus 1. — ^Armadillo {Brandt), 

 Genus 2. — Ctjbaius {Brandt). 

 Genus 3. — Sph^eillo {Dana). 



G^nus 4. — Aemadillium {Brandt). 



Body semi-globose ; head rounded, median lobe minute, arcuated, as 

 a triangular shield. External antennae : second joint of peduncle lobed. 

 Tige three-jointed, hairy, rounded. Coxae of first and sixth abdominal 

 rings obsolete. False feet of last pair : peduncle flattened, lamellar, 

 truncate. Ischium flattened, truncate; external angle produced. Ac- 

 cessory lobes arising from base. Accessory filament flattened, club- 

 shaped, concealed. 



Genus 5. — Diploexochtjs {Brandt). 



Genus 6. — (?) Act^cia {Dana). 



(Which probably should stand as a representative of a separate 

 family.) 



Family.— PORCELLIONID^. 



Genus 1. — Oniscus {Latreille). 



Body flattened. Head transverse, lateral lobes well developed from 

 superior margin of third ring, Avhich is emarginate in the median line, 

 not attaining to front, passing out beneath the orbits. Internal antennae 

 inconspicuous. External antennae : peduncle, second joint lobed at 

 base. Tige three -jointed, articulations rounded, cupped. Coxae of 

 first, second, and sixth abdominal rings obsolete ; third to fifth, broad, 

 curved. Abdominal false feet articulated beneath external angle of last 

 ring. Peduncle triangular, lamellar. Accessory lobe obsolete. Ischium 

 compressed, trigonal, lamellose, along with three-fourths of peduncle un- 

 concealed. Accessory appendage curved, trigone- subulate, almost con- 

 cealed, arising from basal angle of peduncle, which is truncate. 



Genus 2. — Poecellio {Latreille). 



Body flattened or semi-globose {armadilloides). Head transverse : 

 lateral and median lobes well marked, arising from superior margin of 

 third ring, which surpasses frontal line, and is not continuous beneath 

 orbits. Internal antennae inconspicuous. External antennae : second 



