DESCRIPTION OF PLATES. 



PLATE XIX. 



Fig. 1 , Porcellio cingendtia. Fig. 2, Head and first cephalo-thoracic 

 ring of do. Fig. 3, Head and first cephalo-thoracic ring of P. pruinosus. 

 Fig. 4, Fifth and sixth abdominal rings of P. cingendus. Fig. 5, Fifth 

 and sixth abdominal rings of P. pruinosm. Fig. 6, Back view of head 

 of P. cingendtis. Fig. 7, Back view of head oi P. pruinosus. Fig. 8, 

 Abdominal false feet of P. cingendm. a, Peduncle, h, Accessory lobe. 

 Cy Ischium. /, Accessory filament Fig. 9, Tige of external antenna of 

 P. citigendus. Fig. 10, Front view of head, and side view of orbit of 

 Oimcus murarius. a. Line of front by Lateral lobes, c. External 

 antenna), d. Transverse suture. Fig. 11, Peduncle of external an- 

 tenna) of 0. murarius. Fig. 12, Abdominal false feet of 0. murariwi. 

 (References as in Fig. 8.) 



PLATE XX. 



Fig. 1, Philoscia muscorurrif much enlarged. The antennse dispro- 

 portionately large. Fig. 2, Abdominal false feet, last pair ( S )• «, 

 Peduncle, h, Accessory lobe, e, Ischium. /, Accessory appendage. 

 Fig. 3, Fifth and sixth abdominal rings. «, Abdominal false feet 

 Fig. 4, Back view of head. Fig. 5, Front view of head, a, External 

 antenna), b, Internal antennae, c, Superior margin, third segment 

 Fig. 6, Internal antennae. Fig. 7, Ztgia oceanica, false feet Refer- 

 ences as in Philoscia muscorum. Fig. 8, Ultimate abdominal ring. 

 a, False feet. Fig, 9, Side view of orbit Fig. 10, Front view of head. 

 ^, External antennae, r, Superior margin of third ring, d, Internal 

 antennae. Fig. 11, Back view of head of Oniscus murarius. e, Frontal 

 line of head. Cj lateral lobes. 3 c, back of head. 



PLATE XXI. 



Fig. 1, External antennae of Porcellio pruinoius (immature), o, 

 Tige. Fig. 2, External antenna) of P. scaher (immature). Fig. 8, 

 Antennae of Armadillium vul^are. (a) Internal (b) External, b, 

 Tige. Fig. 4, Peduncle and tige of external antennaa of Philo9cia mut- 

 corum. Fig. 5, External antennae of Oniscm fottor. Fig. 3a, Tige of 



E 



