650 CLASS X. 



Praniza LEACH. Head triangular, narrower than thorax. ]\lan- 

 dibles not exsert. Trunk in females consisting of only three 

 segments, the last three being confluent, and forming a single 

 oval scutum broader than the preceding segments. 



Sp. Praniza coeridata, Oniscus marinus SLABBER, SLABBER Natuurk. Vcr/uxt. 

 Tab. IX. figs, i, 2 (copied in Encycl. me'ih., Ins. et Crust. PI. 329, figs. 24, 

 25), MONTAGU Trans. Linn. xi. Tab. iv. fig. 2, &c. 



Compare on this genus J. 0. WESTWOOD, Ann. des Sc. natur. Tom. xxvii. 

 1832, pp. 316332, PI. 6. 



Family XVIII. Oniscides. Two middle antennas very short, 

 of only one or two joints. Last segment of tail short, with the 

 appendages of the last pair of caudal feet concealed or styliform. 



Comp. J. F. BRANDT Conspectus Monof/rapkice Crustaceorum Oniscodormn, 

 LATREILLII, Bulletin de la Soctite imp. des Natural, de Moscou, vi. 1833, 

 pp. 171 193, Tab. iv. figs. 6 21. 



These Isopods may be named Land-Asselli, for although some of 

 them keep to the sea-shore, they do not live in water. The most 

 live under stones, bark of trees, in chinks of walls, &c. They gnaw 

 various substances. At night especially they seek their food, which 

 consists principally of vegetable matters. 



A. Oniscinea. -Basal joint of the last pair of abdominal feet 

 short, not produced beyond the last segment of abdomen. Antennae 

 geniculate, with from six to nine joints (the five basal joints thicker, 

 the terminal seta with one or two, three or four joints). 



Tylos LATE. External antennas moderate, with nine joints, the 

 four terminal joints forming a short seta. Last pair of abdominal 

 feet lamellose, concealed under abdomen. Body contractile into a 

 ball. 



Sp. Tylos Latreittil AUDOUIN, Tylos armadillo LATR., Cloporte SAVIGNY, 

 Descr. de VEgypte, Crust. PI. 13, fig. i, GUKRIN Iconoyr., Crust. PI. 31, 

 fig. 4, EDWARDS, Cuv. R. Anim. ed. illustr., Crust. PI. 70, fig. 2. 



The first four pairs of abdominal feet have a broad quadrangular append- 

 age, in which longitudinal cavities with blind branchings are found. They 

 open at the inferior margin by a row of small foramina, and take up air 

 for respiration. The animal lives on the coasts of Egypt and Algiers. 



Armadillo LATR. External antennas with seven joints. Styli- 

 form appendages of last pair of feet short, not .prominent. Body 

 contractile into a ball. 



