652 CLASS x. 



Philosda LATR. External antennae with eight joints, naked at 

 the base. Segments of tail abruptly narrower behind the last 

 segment of trunk. 



Sp. Oniscus muscorum Cuv. 



B. Ligiea. Basal joint of last pair of abdominal feet slender, 

 elongate, exsert, terminated by two long styles. External antennae 

 terminated by a seta composed of several (twelve to twenty) joints, 

 long. 



Ligia FABR. 



Sp. Ligia oceanica FABR., BASTEE Natuurh Uitspann. 11. Tab. xiu. fig. 4, 

 DESMAR. Crust. PI. 49, figs. 3, 4 ; Ligia italica FABR., GUERIN Iconogr., 

 Crust. PI. 31, fig. 5, &c. These animals live on the sea-coast, but often 

 leave the water and climb on atones, piles, &c. This genus forms the 

 transition to the water-onisci. 



Some species, in their antennae resembling Ligia, have at the last 

 abdominal feet a bifid basal piece, and at the extremity of these two 

 pedicles is a filiform appendage. They live under stones or under 

 moss, in moist meadows, in decaying wood, &c. They form the 

 genus Ligidium BRANDT, Zia KOCH, in HERRICH-SCH^EFFER Deutschl. 

 Ins. Heft 180. 



Sp. Ligidium Personii BRANDT, Oniscus ayilis PERSOON, PANZER Devischl. 

 Ins. Heft 9, Tab. 24, &c. 



Family XIX. Asellota. Antennas four, distinct. Terminal 

 appendages of last pair of abdominal feet produced beyond the 

 body like a tail. Last segment of tail large, scutiform. 



A. First pair of feet, either similar to the rest, or thickened at 

 the apex, and with hook single. 



t Four antennas unequal, external much longer than internal. 

 * All the feet similar, terminated by short double claw. 



Oniscoda LATR. (Janira LEACH). 

 Jceridina EDW. 



Sp. Janira Nordmanni RATHKE, Fauna der Krym, p. 388, Tab. vi. 

 i5- 



Jcera LEACH. 



Sp. Jcera nivalis KROEYER, Gronland's Amfipoder, Tab. iv. fig. 21. 



