91 6 EXPLANATION OF PLATES. 



s. c. i. Region No. i of coiled tube of nephridium. s. c. 2. Region No. i of ditto. 

 s. c. 3. Region No. 3 of ditto. s. c. 4. Region No. 4 of ditto, s. d. Salivary duct. 

 s. g. Salivary gland, si. d. Reservoir of slime gland, sl.g. Tubules of slime gland. 

 s. o. i, 2, 3, &c. Nephridia of ist, 2nd, &c., feet. s. o.f. Terminal portion of nephri- 

 dium. s.p. Secondary papilla, st. Stomach, sf. e. Epithelium of stomach, sy. 

 Sympathetic nerve running in muscles of tongue and pharynx, sy 1 . Origin of pharyn- 

 geal sympathetic nerves. T. Tongue, t. Teeth on tongue, te. Testis. tr. Trach.e0e. 

 tr. c. Cells found along the course of the tracheae. tr. o. Tracheal stigma, tr. p. 

 Tracheal pit. tit. Uterus, v. c. Ventral nerve cord. v. d. Vas deferens. v. g. 

 Imperfect ganglia of ventral cord. 



PLATE 46. 



Fig. i. Peripatus capensis, x 4 ; viewed from the dorsal surface. (From a 

 drawing by Miss Balfour. ) 



PLATE 47. 



Fig. 2. A left leg of Peripatus capensis, viewed from the ventral surface ; x 30. 

 (From a drawing by Miss Balfour.) 



P'ig. 3. A right leg of Peripatus capensis, viewed from the front side. (From a 

 drawing by Miss Balfour.) 



Fig. 4. .The last left (i7th) leg of a male Peripatus capensis, viewed from the 

 ventral side to shew the papilla at the apex of which the accessory gland of the male, 

 or enlarged crural gland, opens to the exterior. (From a drawing by Miss Balfour.) 

 Prof. Balfour left a rough drawing (not reproduced) shewing the papilla, to which is 

 appended the following note. " Figure shewing the accessory genital gland of male, 

 which opens on the last pair of legs by a papilla on the ventral side. The papilla has 

 got a slit-like aperture at its extremity." 



Fig. 5. Ventral view of head and oral region of Peripatus capensis. (From a 

 drawing by Miss Balfour.) 



PLATE 48. 



Figs. 6 and 7 are from one drawing. 



Fig. 6. Peripatus capensis dissected so as to shew the alimentary canal, slime 

 glands, and salivary glands ; x 3. (From a drawing by Miss Balfour.) 



Fig. 7. The anterior end of Fig. 6 enlarged ; x 6. (From a drawing by Miss 

 Balfour.) The dissection is viewed from the ventral side, and the lips, L., have been 

 cut through in the middle line behind and pulled outwards, so as to expose the jaws, 

 /., which have been turned outwards, and the tongue, T. , bearing a median row of 

 chitinous teeth, which branches behind into two. The junction of the salivary ducts, 

 j. d., and the opening of the median duct so formed into the buccal cavity is also 

 shewn. The muscular pharynx, extending back into the space between the ist and 

 2nd pairs of legs, is followed by a short tubular oesophagus. The latter opens into 

 the large stomach with plicated walls, extending almost to the hind end of the animal. 

 The stomach at its point of junction with the rectum presents an S-shaped ventro- 

 dorsal curve. 



