CRUSTACEA. 651 
Sp. Armadillo variegatus Larr., Armadillidium pustulatum EpWaARDs, 
Vitiers Entom. Linn. Tab. xt. fig. 16, Desmarest Crust. Pl. 49, figs. 
6,, 7,, tc. 
To this division belong the Millepedw, more used in medicine formerly 
than at present, Armadillo oficinarum, BRANDT. u. RatzEsure Mediz. 
Zool. 1. Tab. 43, figs. 8—10, CUVIER R. Ani. éd. ill., Crust. Pl. 17, 
fig. 4; from the south of Europe and Syria. 
Sub-genera : Armadillidium Branvt, Diploexochus ejusd., Cubaris 
ejusd., Armadillo ejusd. 
Oniscus nob. (species from genus Oniscus L., Porcellio, Oniscus, 
Philoscia LATR.). External antenne with from six to nine joints. 
External appendage of last pair of abdominal feet stylitorm, exsert. 
Deto Guten. External antenne 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 Guér, Magas. de Zool. 1836. Crust. PI cA, 
Platyarthrus BRANDT. 
Trichoniscus BRANDT. 
Note.—In these genera the external antennz are six-jointed. 
Oniscus Larr. External antenne 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., Dz Geer Mém. p. s. a0 Hist. 
des Ins. vit. Pl. 35, fig. 3, GEOFFR. Ins. tt. Pl. xxit. fig. 1, BRANDT. u. 
Rarzesure Medizin. Zool. 11. Tab. x1I. 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 Laver. External antennz with seven joints. Body in 
most not contractile into a ball. 
Sp- Porcellio scaber LATR., BRANDT u. Rarzepure Mediz. Zool. 11. Tab. XII. 
fig. 6, GUERIN Teonogr., Crust. Pl. 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 Se. 
nat. 2e Série. Tom. Xv. 1841. Zool. pp. 197, 198; comp. V. SIEBOLD in 
Moetuer’s Archiv, Jahresbericht, 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. 
armadilloides. Already Dz Grr had noticed such a species that rolls 
itself up, Oniscus convexus, VII. p- 553; Pl. 35, fig-°1T. 
