382 PEOF. E. E. LANKESTEE ON CEETAIN POINTS IN THE 



EXPLANATION OF PLATES LXXX.-LXXXIII. 



PLATE LXXX. 



Figs. 1, 2, 3. Dorsal, lateral, and ventral view of the prosoma and mesosoma of an 

 Androctonus funestus, in which the venous system has been injected, and 

 is seen showing through the transparent cuticle. 



Scs, sinus cephalicus superior; svsl, sinus lateralis superficialis of the 

 prosoma ; svsl 1 , sinus lateralis superficialis of the genital (first mesosomatic) 

 segment ; svsl 2 -svsl 6 , ditto of the second to the sixth mesosomatic segments. 

 In fig. 2 it is seen that the circumpulmonary sinus is placed in continuity 

 with the vein or sinus svsl 3 , svsl 4 , svsl 5 , and svsl 6 , in each of the lung-bearing 

 segments. 



Fig. 4. Prosomatic carapace of Brotheas subnitens, Gervais : enlarged four diameters. 



Fig. 5. Enlarged view of the sternal and pectinal region of Brotheas subnitens. 



a, the pentagonal metasternite ; b, b, the two totally separate sclerites of 

 the genital operculum; c, median fold; d, sternal sclerite of the pectinige- 

 rous segment ; e, pecten. 



Fig. 7. Dorsal view of Brotheas subnitens, Gervais : magnified twice linear. From a 

 specimen collected by F. Whymper, Esq., in Peru. 



Fig. 8. Ventral view of the same specimen. 



Fig. 9. Enlarged view of the circular spiracle of Brotheas subnitens. 



Fig. 10. Toothing of the chela (hand) of Brotheas subnitens. 



Fig. 11. Toothing of the chelicera of Brotheas subnitens; the left-hand figure is the 

 movable ramus. 



Fig. 12. View of the rami of the chelicera of Brotheas subnitens, to show the cutting- 

 edge as seen from above. 



Figs. 13, 14. Plastron or prosomatic entochondrite of Scorpio (Buthus) cyaneus, showing 

 the attachment of the muscles. Fig. 13. Dorsal surface. Fig. 14. Ventral 

 surface. 



A.C., arterial canal; G.C., gastric canal; n.c, neural canal — only that 

 part of the whole structure in front of G.C. and above n.c. corresponds to 

 the plastron of Limulus ; pf posterior flap (unrepresented in Limulus) ; pjj, 

 posterior process ; Imp, latero-median process ; ap, anterior process ; asp, 

 cornua or anterior tendons of the subneural process ; snp, the subneural 

 process; a, scar of tendinous attachment of the anterior process of the 

 plastron to the horseshoe-shaped " preoral entosclcrite," a chitinous 

 epidermal ingrowth really dorsal in nature, though lying ventrally in front 



