( 10 ) 



Philougria. Plate XXI., Figs. 1 to 4. 



Nearly a similary arrangement prevails, but the lateral ridges around 

 the insertion of the external antennae are somewhat more strongly 

 marked. 



Om'sctis, Plate XXI., Figs. 5 to 7. 



The external angles of the superior mai'gin of the third ring are pro- 

 duced into a broad lobe, which covers over the origin of the external 

 antennae, it is then continued across, projecting slightly over the frontal 

 line of the cephalic segment; the transverse suture is well marked. 

 The second ring very narrow, almost obsolete. The lateral lobes are con- 

 tinued backwards, and are separated by a suture from the external in- 

 ferior border of the cephalic segment, which completes the orbits. 



PorcelUo. Plate XIX., Figs. 1 to 10. 

 External angles of third antennary segment still more developed, 

 the superior margin raised into a lobe which projects above the frontal 

 line of the cephalic segment, and gives the head a trilobed appearance. 

 This lobe, though sometimes badly marked, PorcelUo pruinosus {Br.), 

 P. frontalis {Lereh., -not Udw,), for example, is present in all the species 

 I have had an opportunity of examining. 



Armadillium. Plate XXI., Fig. 3. 



The eyes are supported on the cephalic segment alone, the margin 

 of this is raised, foiming an angular projection in the middle of the 

 forehead, passing back from whence, as before stated, it forms the orbital 

 margin, to the entire exclusion of the third segment, the lateral lobes 

 here being remarkably small, and derived entirely from the cephalic 

 segment. 



The superior margin of the third ring commences beneath the lateral 

 lobes of the cephalic segment, a suture marking its origin, and the margin 

 of cephalic border concealing it, thence it gradually emerges, passing in- 

 wards, and rises above the frontal border as a prominent arched plate, 

 which projects over the frontal line, and is visible from behind. 



Its surface presents the following markings, beginning below : — In 

 the centre, arising from the transversal suture which divides the second 

 and third segments, two divergent ridges passing out on each side, termi- 

 nate at the extremities of the arched superior margin ; external to each 

 of these is a deep sulcus ; bounding the outer edge of this sulcus a curved 

 raised ridge surrounds the insertion of each external antennae, and termi- 

 nates as a large lobe on the outer side of the head ; these are the lobes 

 which are described by authors as the lateral lobes in the Armadillinae, 

 and which differ from the lateral lobes of the Oniscinae in the place of 

 their origin being from the inferior, not superior, margin of third ring. 



The second ring is well marked, transversal, and prolonged on each 

 side into a trigonal point beneath the external antennae, the lobes bear- 

 ing the internal antennae on their summits. When at rest the external 



