EXPLANATION OF PLATES. 917 



A. Anus. at. Antenna. F. i, F. 2. First and second feet. /. Jaws. L. Lips. 

 a-. (Esophagus. or. p. Oral papilla. ph. Pharynx. R. Rectum. s. d. Salivary 

 duct. s.g. Salivary gland, si. d. Slime reservoir, si. g. Portion of tubules of slime 

 gland, st. Stomach. T. Tongue in roof of mouth. 



Fig. 8. Peripatus capcnsis, X4; male. (From a drawing by Miss Balfour.) 

 Dissected so as to shew the nervous system, slime glands, ducts of the latter passing 

 into the oral papilla, accessory glands opening on the last pair of legs (enlarged crural 

 glands), and segmental organs, viewed from dorsal surface. The first three pairs of 

 segmental organs consist only of the vesicle and duct leading to the exterior. The 

 fourth and fifth pairs are larger than the succeeding, and open externally to the crural 

 glands. The ventral nerve-cords unite behind dorsal to the rectum. 



A. Anus. a. g. Accessory generative gland, or enlarged crural gland of the lyth 

 leg. at. Antenna, c. g. Supra-cesophageal ganglia with eyes. co. Commissures 

 between the ventral nerve-cords, d. u. Large median nerve to dorsal integument from 

 hinder part of brain. F. i, 2, &c. Feet. g. o. Generative orifice. a: QEsophagus. 

 (vs. co. Gisophageal commissures, or. p. Oral papilla, p.d.c. Posterior dorsal com- 

 missure between the ventral nerve-cords, ph. Pharynx. /. n. Nerves to feet, one 

 pair from each ganglionic enlargement. si. d. Reservoir of slime gland. si. g. 

 Tubules of slime gland. s. o. i, 2, 3, &c. Segmental organs. z>. c. Ventral nerve- 

 cords, v. g. Imperfect ganglia of ventral cords. 



Figs. 9 and 10. Left jaw of Peripatus capcnsis (male), shewing reserve jaws. 

 (From a drawing by Miss Balfour.) 



Fig. 9. Inner jaw. 

 Fig. 10. Outer jaw. 



PLATE 49. 



Figs, it 16. A series of six transverse sections through the head of Peripatus 

 capcnsis. 



Fig. u. The section is taken immediately behind the junction of the supra- 

 resophageal ganglia, e.g., and passes through the buccal cavity, M., and jaws, o.j. 

 and i.j. 



Fig. 12. The section is taken through the hinder part of the buccal cavity at the 



level of the opening of the mouth into the pharynx and behind the jaws. The cuti- 



.cular rod-like continuation (le.) of the inner jaw lying in a backwardly directed pit of 



the buccal cavity is shewn; on the right hand side the section passes through the 



opening of this pit. 



Fig. 1 3. The section passes through the front part of the pharynx, and shews the 

 opening into the latter of the median backward diverticulum of the mouth (M 1 ), 

 which receives the salivary ducts. It also shews the commencement of the ventral 

 nerve-cords, and the backwardly projecting lobes of the brain. 



Fig. 14. The section passes through the anterior part of the pharynx at the level 

 of the second commissure (co. 2), between the ventral nerve-trunks, and shews the 

 mass of cells developed on this commissure, which is in contact with the epithelium of 

 the backward continuation of the buccal cavity (M 1 ). 



