382 
PROF. E. R. LANKESTER ON CERTAIN 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 
Fig. 
Androctonus funestus, in which the venous system has been injected, and 
is seen showing through the transparent cuticle. 
Ses, sinus cephalicus superior; svs/, sinus lateralis superficialis of the 
prosoma ; svs/}, sinus lateralis superficialis of the genital (first mesosomatic) 
segment ; svs/?—svs/®, 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 svs/*, svs/4, svs/>, and svs/°, in each of the lung-bearing 
segments. 
. 4, Prosomatic carapace of Brotheas subnitens, Gervais: enlarged four diameters. 
. 5. Enlarged view of the sternal and pectinal region of Brotheas swbnitens. 
a, the pentagonal metasternite; 5,6, the two totally separate sclerites of 
the genital operculum; ¢, median fold; d, sternal sclerite of the pectinige- 
rous segment; @, pecten. 
. 7. Dorsal view of Brotheas subnitens, Gervais: magnified twice linear. From a 
specimen collected by F. Whymper, Esq., in Peru. 
. 8. Ventral view of the same specimen. 
. 9. Enlarged view of the circular spiracle of Brotheas subnitens. 
ig. 10. Toothing of the chela (hand) of Brotheas subnitens. 
. 11. Toothing of the chelicera of Brotheas subnitens; the left-hand figure is the 
movable ramus. 
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) eyaneus, 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) ; pp, 
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 entosclerite,” a chitinous 
epidermal ingrowth really dorsal in nature, though lying ventrally in front 
