520 
G. L. GULLAND. 
chitinogenous cells, ck. c. Chitinogenous cells of the integument. 
bm. Basement membranes, du. Lumen of the duct. b. c. Blood- 
corpuscles. cu. Cuticle, etc. Connective-tissue corpuscles. 
Big. 12. — The second to the sixth limbs of the right side of a young 
Limulus magnified, showing the opening of the coxal gland, du, iu its relations 
to the fifth and other appendages, and also the sculpturing on the bases of the 
coxse. The projecting part of the carapace has been cut away close to the 
bases of the coxee. c. c. is the cut edge, and the animal is represented lying 
on its back, with the anterior end towards the left hand. The limbs are thus 
seen from their dorsal surface, and are numbered II to VI. 
Fig. 13. — The base of the coxa of the fifth limb much more highly mag. 
nified, viewed as an opaque object under Pillischer, Obj. f, oc. 3, showing the 
sculpturing and the position of the opening, du, of the coxal gland, c. r. The 
chitinous ridge. 
Fig. 14. — Internal termination of the antennary gland of a young Estheria 
(Phyllopod), showing the end-sac, e. s., probably a specialised connective- 
tissue lacuna, and not part of the nephridium itself. (After Grobben, 
‘ Arbeiten Zool. Inst. Wien.,’ vol. iii, 1881.) 
Fig. 15. — Antennary gland of Mysis. Ceph. Urinary tubes, eo. External 
aperture, hb. Urinary bladder, e. s. End-sac (probably a closed connective- 
tissue lacuna, into which the nephridium opens). 
