58 SELECTED NOTES FROM SOCIETY'S NOTE-BOOKS. 



Fig. 8. — A scale more highly magnified, showing the outline, the 

 ridges, the arcuate internal canal, and the expanded base. 



,, 9. — A scale focussed down to the roots, with portions of six 

 supporting scales. 



,, 10. — Longitudinal section, small spine-like scale of Thorn-back 

 Skate, showing the structure like dentinal tubuli. 



,, 11. — Transverse section, part of same. (Figs. 10 and 11 are from 

 Micro. Dictionary.) 



Drawn by TufFen West. 



Plate IV. 



Upper Portion. 



Illustrating Red Earth-Mite. 



Fig. 1.— Left Palpus, x 50. 



,, 2. — Mandibles, or Cultrate cheliceres. 



,, 3. — Penniform hair. 



,, 4. — Clubbed hair, 



,, 5. — One of the clubbed hairs focussed to the upper (outer) rim of 

 the sujjporting papilla. 



,, 6. — End of the second limb of the left-side (L. 2), showing the 

 sickle-shaped claws, and the excision of the joint to receive 

 them when retracted. 



,, 7. — Extremity of L. 2 in the Dog-tick (Ixodes ricinus) from a 

 specimen in my possession ; the mode in which the sucker 

 folds together when not in use is well seen here. 



,, 8. — Argas reflexus, extremity of L. 2. 



,, 9. — Labium with palpi. 



,, 9a. — Plume of labium more magnified, after Duges. (From 

 Micro. Dictionary.) 



Drawn by Tuffen West. 

 Lower Portion. 



„ 10. — Parasite from an Ostrich, Tyroglyplms, $ viewed from 

 beneath, as an opaque object, x 130. 



Drawn by H. M. J. Underhill. 



Plate V. 



Upj^er Portion. 



Fig. 1. — Tongue of Cricket. 



,, 2.— Labium of Cricket, from West wood, somewhat enlarged. 



>, 3. — Portion of the fine extremity of one of the channels, 

 X 350 diam. 



,, 4. — Portion of one of the main trunks, x 350 diam. 



Lower Portion. 

 Showing the Homologies of the Dorsal Plates of the Wood-Louse 



and of the Cockroach. 



