EXPLANATION OF PLATES VI, VII, VIII, IX, X, XI, XII— continued. 



tissue, b. Skeletal product (capsule-like trabeculae) of the lacunar connective 

 tissue, d. Spherical refringent bodies lying in the protoplasm of the cells of 

 the lacunar connective tissue, e. Central lacuna or space of an areole of 

 the lacunar connective tissue. F. A caecum of the gastric gland (so called 

 liver) in transverse section. G. A testicular ampulla. H. Line of transition 

 from the lacunar connective tissue to the compact many-celled connective 

 tissue forming the cortical substance of the coxal gland. /. Compact con- 

 nective tissue forming the cortical substance of the coxal gland, containing 

 some spaces {e) which, though resembling the gland-caeca, are identical in 

 nature with the lacunae of the lacunar connective tissue. E. Lumen of 

 caeca of the coxal gland. I. Gland-epithelium of the coxal gland lining the 

 spaces K. m. Intercaecal connective tissue or framework of the coxal gland. 



Fig. 2. — A portion of the lacunar tissue of Limulus with five gastric caeca 

 in section {F F). G. Testicular ampulla. Magnified 150 diameters. 



Fig. 3. — A portion of the lacunar tissue of a scorpion (Androctonus 

 funestus) with several gastric caeca in section (/^F), for comparison with 

 Fig. 2. Magnified 150 diameters. 



PLATE XI. 



Fig. 1. — Lacunar tissue of Limulus, magnified 430 diameters, a. Nuclei. 

 b. Skeletal trabecular element, d. Refringent corpuscles, e. Central space 

 or lacuna of an areole. p. Protoplasm of the cells. 



Fig. 2. — A similar specimen with less abundant protoplasm, showing also 

 fine blood-vessels {B. F.) and contained blood-corpuscles {b. c). Other 

 letters as in Fig. 1. Magnified 430 diameters. 



Fig. 3. — Lacunar tissue of a scorpion ( A. nd roc tonus funestus), coloured 

 and lettered in the same way as Figs. 1 and 2. Magnified 430 diameters. 



Fig. 4. — Capsuligenous (cartilaginoid) tissue from the entapophysial liga- 

 ment of Limulus. Magnified 300 diameters. The transition of fibroid tissue 

 (similar to that of the entosternite, and here forming the cortical layer of the 

 ligament) into the capsuligenous tissue is shown, a. Cell-nuclei, b. Capsule- 

 wall, e. Space within the eapsule not occupied by protoplasm, corresponding 

 to the space e in Figs. 1 and 2. x. Problematic enlargements of the skeletal 

 substance, possibly blood spaces. B. Fibroid cortical tissue of the ligament. 

 ft a. Cell-nuclei of the same, b h. Matrix (skeletal substance) of the same, 

 continuous with the capsules of the capsuligenous tissue. 



Fig. 5. — Section of a portion of the coxal gland of Limulus, in order to 

 show the irregular form of the spaces (really anastomosing with one another) 

 which constitute the lumen of the gland K. Magnified about eighty 

 diameters. 



Fig. 6. — Gland-epithelium layer of the coxal gland of Limulus, as seeu in 



