644 WILLIAM A. HASWELL. 



pharynx, the bifurcate posterior vessel of the excretory system, 

 the rod-liice chitinous supports of the penis sheath, the 

 laterally placed vitello-ovary, and the unpaired laterally 

 placed testis. In view, however, of the necessity for a more 

 thorough knowledge of the structure of the described species 

 of Prorhynchus in these and other respects, I think it best 

 to regard the New Zealand species provisionally as a member 

 of the genus Prorhynchus, and propose for it the name 

 P. putealis. 



EXPLANATION OF PLATE 48, 



Illustrating Mr. William A. Haswell's paper " On a Pro- 

 rhynchid Turbellarian from Deep Wells in New Zealand.'^ 



Tig. 1. — Semi-diagrammatic view of the organisation of Prorhynchus 

 putealis as seen from the ventral aspect, x 10. a. I. v. Anterior longi- 

 tudinal trunk of excretory system, cce. Diverticulum at the anterior end of 

 the intestine, com. Commissure between the brain ganglia, c. s. Ciliated 

 sac. ej, Ejaculatory duct, ex., ex. Excretory apertures, int. Intestine. 

 l.n^. Large longitudinal nerve-cord. l.n^. Smaller longitudinal nerve-cord. 

 od. Oviduct, ov. Ovary, ph. Pharynx, s. b. Bursa seminalis, sp. d. Ante- 

 rior portion of sperm-duct. sp.d^. Posterior portion of sperm-duct. ie. 

 Testis, ut. Uterus, v.s. Vesicula seminalis. $. Female aperture. 



Fig. 2. — Semi-diagrammatic representation of a transverse section of the 

 body in the middle of the intestinal region, to show the relations of the 

 various organs. X 30. ex. Excretory vessels, int. Intestine, l.u^. Large 

 longitudinal nerve-cord. /. 7i^. Smaller longitudinal nerve-cord. ov. Ovary. 

 te. Testis. 



Fig. 3. — Section of the integument, b. Basement membrane, c. Cuticle. 

 ep. Epidermis, e.c.m. External circular layer of muscle, e.l.m. External 

 longitudinal muscular layer, dct. Ducts of deep integumentary glands, gl. 

 Superficial integumentary gland. 



Fig. 4. — Portion of a transverse section of the pharynx, e. c. External 

 circular layer, e. I. External longitudinal layer, ep. Epithelium, gl. 

 Glandular zone. i. c. Internal circular layer. 1. 1. Internal longitudinal 

 layer, r. Radial fibres. 



