- 34 - 



Explanation of figures. 



Illustrating Mr. L. H. Gough's paper on "The Develop- 

 ment of Admetus pumilis : a Contribution to the 

 Embryology of the Pedipalps. 



[N. B. — It must be borne in mind that the descriptions in the 

 text are made from whole series of sections, but that the drawings 

 were each made from one cut only.] 



Fig. 1 and la. — Embryo of Stage V; explanations in the text. 

 Magnified 6 times. 



Fig. 2. — Reconstruction of brain of embryo of Stage V. Tho 

 parallel lines are to demonstrate the position of the cavity caused by 

 the alimentary canal, otherwise as in text. Magnified 9 times. 



Fig. 3. — Sagittal section of lateral organ of embryo of Stage IV. 

 Magnified 80 times, c. Cuticle, d. Deposit, e. w. External wall. i. w. 

 Internal wall. p. Partition, o. c. Outer cavity, i. c. Inner cavity, y. Yolk. 



Fig. 4. — Sagittal section of part of the abdomen of embryo of 

 Stage V, with genital cells. Magnified 110 times, v. Vacuole of germ- 

 cell, mn. Micro-nucleus of germ-cell. n. Nucleus of germ-cell, c p. 

 Cell-plasm of germ-eel.', a. e. Fifth abdominal extremity, c. Remains 

 of ccelom. 



Fig. 5. — Sagittal section of a portion of the heart of embryo of 

 Stage V. Magnified 165 times, w. Walls of heart, b. c. Blood-cells. 

 y. Yolk e. Epidermis. 



Fig. 6. — Sagittal section through cephalothorax of embryo of 

 Stage V. Magnified 30 times, c. g. Coxal-gland. o. c. g. Opening of 

 coxal-gland. d. v. m. Dorso-ventral muscles, a. b. Accessory brain. 

 b. Brain. 



Fig. 7. — Horizontal section of rectum and midgut of embryo of 

 Stage V. Magnified 110 times, e. Epidermis, re. Rectum, en. Ento- 

 derm cells forming mid-gut. m. Muscles forming sphincter and dila- 

 tors, y. Yolk. 



Fig. 8. — Sagittal section through embryo of Stage IV, showing 

 Anlage of part of ventral ganglion cord, and development of ganglia 

 out of small sense-organ-like structures. Magnified 140 times. S. Sur- 

 face pit. cav. cavity. S. f. supporting fibre, tu. tube. 1—9 Sense organ- 

 like structures at different periods of growth. 



Figs. 9 and 9 a. — Sagittal sections through lateral eyes of embryo 

 of Stage V. Magnified '210 times. 1,2, 3. First, second, and third eye. 



Fig. 10. — Horizontal section of median eye of embryo of Stage V. 

 Magnified 240 times. I. Lens. co. Stratum corneum. p. Pigment. 

 R. Retina. *F. Fissure. P. R. Post-retinal layer, c. c. Subocular cavity. 



Klsau. Druek. vorm. G. Fiachbach, Str»s«burg. — 6097 



