CRUSTACEA. 651 



Sp. Armadillo variegatus LATE., Armadillidium pustidatum EDWARDS, 

 VILLERS Entom. Linn. Tab. xi. fig. 16, DESMAREST Crust. PI. 49, figs. 

 6, 7, &c. 



To this division belong the Millepcdce, more used in medicine formerly 

 than at present, Armadillo officinarum, BRANDT, u. RATZEBURG Mediz. 

 Zool. n. Tab. 43, figs. 8 10, CUVIER 7?. Aid. ed. ill., Crust. PI. 17, 

 fig. 4 ; from the south of Europe and Syria. 



Sub-genera : Armadillidium BRANDT, Diploexochus ejusd., Cubaris 

 ejuscL, Armadillo ejusd. 



Oniscus nob. (species from genus Oniscus L., Porcellio, Oniscus, 

 PJtiloscia LATE.). External antennae with from six to nine joints. 

 External appendage of last pair of abdominal feet styliform, exsert. 



Deto GUERIN. External antennae with nine joints, the four ter- 

 minal joints small, forming a very short seta. Styliform appendages 

 at last segment of body elongate. 



Sp. Deto echinata GUERIN, Magas. de Zool. 1836. Crust. PI. 14. 

 Platyarthrus BRANDT. 

 Trichoniscus BRANDT. 



Note. In these genera the external antennae are six-jointed. 



Oniscus LATH. External antennae with eight joints, inserted 

 under the anterior margin of head, which is somewhat prominent. 

 Body not contractile into a ball. 



Sp. Oniscus asellus L., Oniscus murarius Cuv., DE GEER Mem. p. s. a V Hist, 

 des Ins. vn. PI. 35, fig. 3, GEOFFR. Ins. n. PI. xxn. fig. i, BRANDT, u. 

 RATZEBURG Medizin. Zool. u. Tab. xn. fig. 7 ; the cellar- oniscus, mostly 

 7'" or 8'" long, ash-grey above, with yellow spots on the side. This little 

 animal is very common on walls in moist places. 



Porcellio LATR. External antennae with seven joints. Body in 

 most not contractile into a ball. 



Sp. Porcellio scaber LATR., BRANDT u. EATZEBURG Mediz. Zool. n. Tab. xn. 

 fig. 6, GUERIN Iconogr., Crust. PI. 31, fig. 7. In Porcellio and Armadillo 

 (not in Oniscus} the external plates or covers of the two anterior abdominal 

 feet have a whitish body, which is hollow internally, and receives air from 

 a fissure by many openings. See DUVERNOY et LEREBOULLET Ann. des Sc. 

 nat. IQ Sdrie. Tom. xv. 1841. Zool. pp. 197, 198; comp. V. STEBOLD in 

 MUELLER'S Archiv, Jahresbericlit, p. 141. LEREBOULLET found a similar 

 structure in the external plate of the first five abdominal feet of two species 

 of Porcellio, which roll themselves up, whence he named one of these Pore, 

 armadilloldes. Already DE GEER had noticed such a species that rolls 

 itself up, Oniscus convexus, vii. p. 553, PI. 35, fig. n. 



